In My Little Pony: Friendship is Magic, most people who have tried to estimate pony heights have chosen apples as the only constant between our world and theirs. They seem to all agree that an apple is about four-inches (10.1 cm) tall, based on nice juicy apples in our world -- and Applejack only grows nice juicy apples, right?

The only problem with this is that the animators tend to be rather inconsistent in the sizes of the ponies in different episodes. But, usually, when apples are shown they are consistently the same size in relation to the ponies.

I’ve seen other measurements attempted, but they choose items that are arbitrary in height, such as a candy cane that Twilight said was eight feet tall (243 cm), but we have no way of knowing if her definition of a foot is the same as ours, and thus it is unreliable. Or assuming that a doorway is six-feet six inches (198 cm) high when there is NO standard for door heights in the our world (doorways in Japan are notably shorter than in Denmark). Or using other self-referential measurements that cannot be reliably assigned to human equivalents.

Apples, at least, on average, appear to have a fairly uniform size on earth and do not vary widely in size in the same types when properly cared for.

However, before we can measure their height, we have to have a definition of what we’re measuring. People are measured from the top of their head to the floor, with their shoulders back and back straight. However, ponies and horses can move their head forward and back, changing their height, and making their height impossible to measure accurately. As a result, horses and ponies in our world are measured from the root of the lowest, last hair of their mane to the ground.

The people equivalent is standing up straight, with your shoulders level. Place a stick across your shoulders and place your hand across your neck on the stick. The last root-hair of your head-hair is about two fingers above the stick. Hairs below this point do not grow longer than an inch or so. Hairs above this point grow up to several feet in length. Thus, that’s where horses are measured for height.

In the show, we can estimate that measuring point on the ponies as the shoulder, as seen from a side profile, as the artists seem to use the ponies shoulders as the cut off point for most manes. Using this method yields an average height for the Mane Six of about six apples, twenty-four inches (61 cm), according to the ones I’ve seen here and here.

This makes the average pony about knee-height for most adult people. And remember, we're talking about the height of the ponies' backs.

For traditionally short peoples, like the Indonesians (male: five-feet two-inches, 158 cm; female: four-feet ten-inches, 147 cm), the ponies would be above knee-height. For traditionally tall people, like the Danes and Dutch (male: six-feet zero-inches, 183.2 cm; female: five-feet seven-inches, 169.9 cm), the ponies would be below their knees.

Still, about knee height.

And, from Equestria girls, Fervidor was kind enough to make this comparison, using Fluttershy's beloved rabbits. From this, if we assume that the rabbits are the same size here as there, then, again, we see that the ponies are about knee-high.

But what does that mean in terms of weight, though?

Here we see those intrepid pioneers in pony measurements again resorting to apples, their volume, and quite a lot of hand-waving and guessing. Or just plain saying they weigh the same as people.

There is a better way, however.

In our world there is a breed of horse known as miniature horses. A miniature horse is defined as any horse that is under thirty-four inches (88 cm) tall. A miniature horse is not a pony, although ponies are defined simply as horses smaller than 4-feet 10-inches (147 cm).

The miniature horse definition excludes dwarfism afflicted horses, such as the tiny horse Thumbalina (1-foot, 5-in, 43 cm tall, weight: 57 lb, 26 kg), which is very small indeed. Miniature horses, by definition, are fully formed duplicates of a normal horse, only smaller, with all the features proportioned properly for their size. Not a part of that definition, though, is that unlike many ponies, miniature horses contain the horse phenotype as part of their genetic code.

From Equi-Analytical Labs I pulled a chart of “Weight and Height Ranges for Common Breeds.” In that chart is this entry:

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Miniature Horse, American, 198-496 pounds (90-225 kg), 24-35 inches (60-90 cm) tall.

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A nearly perfect match of a twenty-four inch tall miniature horse to Twilight and company in MLP!

So, if Twilight teleported to Earth she would weight around 198 pounds (90 kg) as a pony. And if she stood on her rear legs she could look you in the eyes if you were an average-height girl!

But, for a human girl of about eighteen to weigh 198 pounds would make her very big, even though all that extra weight is muscle (remember, the Mane Six walk almost EVERYWHERE). In fact, from an “Ideal Height/Weight” chart she would have to be six feet three inches (190.5 cm) tall to avoid looking like an over-muscled freak! And this even accounts for the fact that the extra weight is muscle and not fat (which takes up three times the space that muscle does). If you make that extra mass fat, well, all the Mane Six look obese and not just over-weight.

Now, I wouldn’t mind Twilight or Rainbow Dash being that tall (though thinking of Fluttershy being that tall and trying to hide all the time is hilarious), but they certainly wouldn’t be those cute little girls shown in Equestria Girls! The mirror portal must have trimmed a few pounds off. Or compressed their mass to fit the smaller package.

You could, of course, say that the girls are taller than average, say five-feet ten-inches (177 cm), and that the extra mass came out as rather large “DD” cup chests for the Mane Six (“DD” breasts are about twenty-three pounds (10.45 kg) total for an average height and weight adult woman). That would still give them slim figures.

What are the implications for If Wishes were Ponies?

First, I’m assuming that the ponies and fillies are all average in height for their ages (except Harry), and that the extra mass is just extra-dense muscle, so they don’t appear freakishly tall to everyone. Or freakishly over-muscled.

Second, the fillies are eleven years old, same as Harry. Or perhaps a bit older by half-a-dozen months. Harry is under-sized from his nutrition at the hands of the Dursleys, so his height and weight are about two years behind the fillies. (In real life, based on what Harry said regarding his meals and how skimpy/few they were in the books, he would have been behind in physical growth by at least one, if not two, years.)

From New Parent via Quora, the average weight for an eleven-year-old girl is about ninety-three pounds (40 kg). Given that the ponies appear to have forty percent more mass, as adults, than humans, the fillies should weigh somewhere between ninety-three pounds (40 kg) and one-hundred-thirty pounds (59 kg) each. Heavy, but certainly well with range for cuddling when in pony form.

Picking them up, however, would require much more than a little strength. It would be well out of the ability of most high-school-aged girls, given that the ponies probably would weigh more than the girls trying to pick them up!

For comparison, Einstein, the smallest miniature horse in the world, measures twenty-inches tall and just over one hundred pounds (45.5kg), meaning the fillies, being taller as ponies, would weigh more (see below). Which fits in with my estimates on the weight differences between humans and ponies.

Naturally, this extra-dense muscle makes them stronger and have more stamina than the other students.

Using the same chart, the fillies would be around four-feet ten-inches (147 cm) tall as children their age. Using the same sizing proportions of girls-to-adults from the charts on the fillies-to-adult ponies gives us a filly height of twenty-one inches (53 cm). Notice this is just an inch (2.54 cm) taller than Einstein, so the greater volume of their larger size as ponies would indeed make them heavier than a normal girl of the same age. I doubt it would be a full forty-percent, however.

Twenty percent additional would be more likely, which is what I decided to use. (That is, if you assume a barrel diameter (a horse's torso is called a barrel) of ten inches (25.4 cm) and leg length of ten inches (25.4 cm), for a total height of twenty (50.8 cm), and then increase the barrel to eleven inches (28 cm), you get a difference in volume of about eighteen percent. A horse's barrel, of course, is not a perfect circle, so that number is very approximate. But it gets us on the football field, at least.)

Thus, the three fillies in my story weigh around one-hundred twelve pounds (50.7 kg), and are about twenty-percent heavier than the average student their age. They are four-feet ten-inches (147 cm) tall as students, which is average for their ages, and twenty-one inches (53 cm) tall as ponies, also average for fillies in Equestria about their ages).

Harry (remember he’s about two years behind everyone else in physical development) is four-feet five-inches (109 cm) tall and weighs seventy-nine pounds (36 kg) as a person (remember, he weighs twenty-percent more — coming from what Equestria would consider normal weight for his height — and he’s had a whole year to put on the extra mass). He is nineteen inches (48.2 cm) tall as a pony-colt.

So, as ponies, Harry’s and the fillies’ backs are at nineteen-inches (48.2 cm) and twenty-one inches (53 cm) tall, respectively, and are barely knee-high for most adults, and above knee-high for students close to their own ages. Their heads add about eight-inches (20.4 cm) to that height. Meaning that most tables would be just brushing their ears as they walked under them.

And the unicorns’ horns would be pointed at your belly button.

And with their overly large eyes and short stature, they would be irresistibly adorable and cute to any girl under the age of eighteen.

But what if a human went to Equestria through the portal and became a pony, as Harry did?

That’s fairly simple. If an average height adult went through they would look like an anorexic pony as their age and weight would make them severely underweight (remember that 40% more mass issue a pony has). So, this would be like seeing a one hundred fifty-five pound (70.5 kg) male at five-feet ten-inches (178 cm) height (average height/weight adult) compared to a man of the same height but weighing just ninety-three pounds (42.7 kg) — ribs are easily visible, joints stick out markedly from muscles, muscles look as if they are barely covering the bones, and their face is thin and gaunt.

However, their coat, mane, and tail would look nice and shiny — like healthy hair should. That’s because he/she would be perfectly healthy, or at least as healthy as they were back on Earth, and wouldn’t notice anything different other than the obvious change in form.

The first thing a pony would do is start stuffing them with food!

Of course, you could make your protagonist forty pounds (18 kg) or so overweight. Not exactly a stretch of the imagination if you’re a lazy, out-of-shape American who spends all his/her free time parked in front of a computer or console game! And has a sedentary indoor job (like me).

Or, if you want, make them a couple of inches shorter than the other ponies at about twenty-to-twenty-one inches (50.8-53.3 cm). This would allow their weight to remain the same as back home.

Naturally, everypony would mistake them for a colt or filly at first sight, which would lead to quite a few problems for the hero/ine.

Age! How Long do they live?

Aging is another issue. Miniature horses live about twenty-five to thirty-five years, with one, Angel, a dwarf miniature horse who lived with the Horse Protection Society of North Carolina, among the oldest living miniature horses at an age of over fifty.

Humans, by contrast have an average lifespan of eighty to eighty-five years for females and seventy-five to eighty years for males -- from Global Burden of Disease 2010 study (I sorted by highest and took the highs and lows of the top thirty-six countries. Countries below those have poor healthcare systems and disease is a major influence, not lifestyle). Indonesian Saparman Sodimejo, known more commonly as Mbah Gothoongest, was claimed to be 146 at his death on April 30, 2017. The longest verified human lifespan is Jeanne Calment of France (1875–1997), who lived to the age of 122.

So, humans live about two-and-a-half times longer than miniature ponies.

However, in My Little Pony: Friendship is Magic, we have Granny Apple stating she remembers the founding of Ponyville (and enough jokes about how silly that is as a town/village name. Have you plebeians never heard of The Isle of Man off the coast of Britain? Or how about the three different towns across the USA named Mannville? And then there’s the village of Buen Hombre — Friendly Man — in the Dominican Republic. There is even a Humansville in Polk County, Missouri! Not to mention the tremendous number of people whose names are derivatives or translations of the word "Man").

Remembering the founding should make her almost three hundred years old.

On the other hand, in Harry Potter, we have wizards and witches who appear to live twice as long as the average person.

So, perhaps magic goes a long way in extending your lifespan!

Because my story involves the Harry Potter world, I’m just gonna say that magic is the solution, and that Equestrian ponies, in their much more magically intense environment, live longer than wizards and witches on Earth.

Thus, ponies who immigrate to Earth will see a decrease in life-span longevity, and wizards and witches who move to Equestria will see longer lifespans. Visiting for an extended period of time, say a decade or so, will have little to no effect.

Food! Glorious Food!

Ponies and horses, contrary to popular opinion, can eat meat. Meat is a high-protein food source, and all animals require protein. First, check this out:

Herbivores have special digestive bacteria in their stomachs that process the plant material ingested and produce proteins. The proteins are then digested in the lower intestinal tracts. However, it takes a great deal of plant-eating, and time, to get that protein.

Carnivores lack those plant-specific bacteria, but instead get their protein directly from the animals they eat. To carnivores, herbivores have done all the hard work of converting lots of plant material into proteins, saving them a significant amount of time and energy.

Which is why we see carnivores lazing around in the background of all those Wild Africa films while the herbivores are busy spending the entire day filling their stomachs with plant material. The carnivores can afford to lazy around and do nothing for the entire day because herbivores are such high protein packages!

Normally, herbivores are defined as an animal that eats only plant material. However, herbivores can eat meat (i.e., mad-cow disease is spread by cattle eating meat by-products — lungs, spleen, kidneys, brain, livers, blood, bone, etc. — from slaughter houses that are recycled into protein pellets for resale to cattle-ranchers — which is spread to people who then eat the steaks from the cows that ate contaminated pellets).

A horse or pony can be given meat, they can digest it. This doesn't mean that a regular diet of meat in the long-term is a good thing. Deadly Equines, The Shocking True Story of Meat-Eating & Murderous Horses, by CuChullaine O'Reilly, the Founder of the Long Riders’ Guild, explores the fact that horses can and do eat meat (and can behave in quite violent manners to get it).

As The Spruce Pet puts it, “However, that they can and do eat meat does not mean that they should. A horse may be trained to eat meat, or it may be driven to it by need. This doesn’t mean that a regular diet of meat in the long-term is a good thing. Your horse may like an occasional bite of your hamburger or tuna sandwich and can eat it without harm. However, since we don’t know the long-term effects on most horses, a diet high in meat would be inadvisable (along with expensive). Horses have the teeth and digestive system of a highly specialized herbivore. Few of us are going to take our horses on Antarctic expeditions and our horses will likely be healthiest eating the diet their digestive system evolved to digest.” (The reference to Antarctic expeditions refers to many extremely cold-weather climates where shipping meat as a source of protein for horses and ponies is much cheaper than shipping many more tons of hay. Or, for example, in Tibet, where the mountain ponies are fed blood-soaked hay and grass to provide them the protein they need to survive the long winters when normal feed is limited.)

Thus, for a pony-civilization, eating meat might be considered unusual, or restricted to those who are rich enough to afford buying meat. Considering that most of the animals we consider food (buffaloes, cows, sheep, rabbits, birds, etc.) are intelligent in MLP, their sources for meat are rather restricted — primarily fish, I would guess. And maybe snakes.

It is easy to imagine the ultra-rich unicorn or earth ponies throwing parties where they show off their wealth by serving tuna casseroles, baked stuffed shrimp, or caviar. And that there are a few very expensive restaurants in Canterlot and Manehattan that have meat dishes for their more “refined” clientele. Cloudsdale, on the other hand, would have many restaurants and grocers where fish are readily available.

Pegasi would be partial to eating meat on a semi-regular basis, especially fish, because flying undoubtedly takes more energy than walking or standing behind a counter. And that higher energy requirement would also explain their penchant for napping — conserving their energy reserves. Either for their strenuous activities just completed or for later on. In both cases, high-energy food packets would be a regular necessity.

Their greater mobility would make it possible for them to fly to lakes or nearby seas and do a bit of “dive fishing” for tasty bits of protein packages, instead of stalking their dinner in difficult-to-manoeuvre-in forests. Or groups of them could drag nets through the waters to catch larger numbers of fish.

Unicorns wouldn’t need nearly as much protein unless they are casting large amounts of magic on a regular basis, or are about to or have just completed magically exhausting activities.

So, for If Wishes were Ponies, ponies eat meat. Most unicorns and earth ponies are appalled at the thought, or even repulsed, but high-energy-users such as pegasi, and very powerful unicorns like Twilight and Shining Armour, do so on a regular or semi-regular basis, and especially before or after exceptionally-taxing activities.

Family Units

All mammals have babies in equal male/female ratios. That is, there are just as many male as female babies born, on average. Humans, for example, have more boys born than girls, ~ 1.07:1.00. With onset of puberty it begins to fall until there are more females than males. The fall in male numbers is attributed to “risky behaviour” by adolescent males. (Otherwise known as "Hey, guys, watch this!")

Horses and ponies raised on ranches reflect that fact. There are just as many fillies born as colts. And, under the protection of the rancher, the ratio of adult stallions to adult mares is roughly equal.

Horses and ponies in the wild, however, have an average of one adult stallion for every three adult mares. What happened to the other two stallions?

Nature happened. Once a colt becomes a stallion, he leaves the herd. Because the stallion is no longer in a herd, he has to survive without the benefit of other ponies keeping watch while he eats or sleeps. This increases the stress on the pony’s body and reduces his stamina. These facts make lone stallions easier prey for predators, hence reducing their numbers.

Stallions do form small groups for mutual protection, but they also frequently fight, leading to injuries which, again, makes them more susceptible to ending up as a predator’s meal.

My Little Pony is a show for little girls by Hasbro and intended to assist Hasbro in the selling of products aimed at little girls. The emphasis of the animation is going to be on figures and situations the little girls can put themselves into, that they can pretend they are the character portrayed in a particular situation.

This means that the emphasis is going to be on female protagonists and female antagonists. The in-show ponies are made old enough so that they can “appear” to be living without parental involvement, or interference.

And that means that you simply are not going to see many male characters interacting with the female heroines and villains.

But let’s see what the show actually gives us. From the My Little Pony: Friendship is Magic wikia , which has a list of all the in-show ponies seen (including background ponies) we get:

◾ Mare: 1270 (42.52%)
◾ Stallion: 1008 (33.75%)
◾ Filly: 276 (9.24%)
◾ Colt: 106 (3.55%)

That makes a male-to-female ratio of 3:4. Not a bad match to what one would expect for mammals. Given the show’s focus on female characters, it shouldn’t be a surprise that most of the characters seen are female. After all, if this were G.I Joe, which is aimed at boys, we should expect to see mostly male characters, right? The skewed numbers for colts and fillies is simply a reflection of their age group interactions (girls at that age primarily play with other little girls, ditto for boys), and that the show is focused on female characters. Male characters are little more than plot devices.

So, Equestrian ponies, just like ponies here on Earth, have a gender ratio of 1:1.

However, because ponies in the wild have a ratio of one stallion for every three mares, we can play with those numbers in any way we desire.

Given the fact that there are three sub-species (earth, pegasus, and unicorn) that have genetics that can pass over generations (the Cakes, both Earth ponies, having unicorn and pegaus children indicates that their genetic code is a lot more complex than ours), it’s not a small jump to argue that the gender ratio is likewise skewed from what other mammals on their world might experience.

Meaning the gender of a foal is not simply a single gene donated by the father, but a part of a set of the six genes from both parents that determine the foals sub-species.

Furthermore, if the parental ancestral lineage for several generations on both sides is one particular sub-species, then the foal will very likely match its parents. The closer to the parents an ancestor is that was a different species, the higher the possibility that the foal will not be the same sub-species as the parents. Assuming, of course, that both parents are the same sub-species.

For If Wishes were Ponies that is the direction I chose. The complexity of the sub-species genetics means that there is a gender ratio of one colt for every three fillies.

In MLP canon, ponies have only one form. In HP canon, wizards have the possibility of being an animagus. Therefore, when a pony visits Earth and becomes a wizard/witch, their animagus is as a pony. A wizard/witch from Earth becomes a pony in Equus, and therefore can’t change to their human form, just as ponies in Equus can’t change form without the assistance of a spell.

There is a spell to make ponies other animals (Twilight makes herself and others into Breezies), but it is a specific spell, not a natural ability, just as there is a spell to change a wizard/witch into an animal (Mad-Eye transforms Draco into a weasel).

If a human visits Equestria:

Mundane, no magic at all. They do not change and will never be able to grasp magic in their own two hands without technical assistance.

"glints", people with the merest hint of magic, just enough for the portal to work with. They become ponies and enjoy the full benefits therein, but only in Equestria. They will be pegasi, but not very powerful. There is not sufficient magical saturation on earth for them to draw upon. However, they will still be able to use magi-tech.

Squibs, failed wizards. They can sense magic, faintly, but not enough to use traditional wizardly arts. A trip through the portal will make them pegasi. As the animagi transformation appears to be primarily technical in nature, memory of their Equestrian experience should be all a squib needs to re-assume pony form on earth, but only if they are close to the borderline of being a wizard. Given a pony’s natural connection to magic, they will enjoy greater ease in magic use in this form. Squibs on the borderline to being wizards are earth ponies.

Wizards and Witches, realized or not, have the potential to make full use of magic, and will be a unicorn in Equestria. As Molly Weasly demonstrated, taking ponish form again after holding it before is no great challenge for a full wizard. Wizards/witches become unicorns.

Toddler wizards/witches will be pegasi, Young children will be earth ponies. At age 11, or thereabouts, the children will be unicorns.

Special case: A metamorphmagus in Equus has a limited ability to change their appearance, similar to changelings (no imitating rocks, walls, or other inanimate objects), but she does not need love and her normal appearance is as a pony.

Logic:

1. Scootaloo has no talents with magic without her wings (can’t fly, can’t manipulate weather, etc.. Deprive a pegasus of their wings and they can’t even do as much as an earth pony, although they might be a match in some areas – see Rainbow and Applejack racing);

2. Apple Bloom can manipulate plants and is stronger than Scootaloo (only magic can deprive an earth pony of their magic);

3. Unicorns, of course, can do magic and, potentially, using magic can do everything a pegasus or earth pony can do.

If an Equestrian visit Earth:

If Equestrian visit Earth they become animagus humans with their Equestrian form as the animal. Their magic tends to be “overpowered” from what wizards and witches expect because the Equestrians come from a magic-rich environment. Unicorns have an innate understanding of magic because they’ve been using it all their lives. The others have to learn, just like wizards and witches. Pegasi and earth ponies have an edge in their respective fields (air/weather and plants/soil).

Changelings, in MLP canon, can be take any form, including appearing as inanimate objects. They are not stronger earth ponies, they are not faster than pegasi, nor is their magical ability better than unicorns. If they become a dragon they do not get a dragon’s abilities or strengths (see Pharynx fighting the maulwurf). On Earth, the only close equivalent is metamorphmagus. So, appearance wise, they are human. They still require love. (I considered a Hengeyokai, specifically Kitsune, a fox that can change into human and other forms, but it is overpowered for the situation.)

Other Creatures from Earth.

House-elves become Gremlins. That seems the closest match.
Dragons become dragons. and Vice versa.

Blueblood is an arse to every pony he considers a gold-digger (which is everyone except Tia and Luna). As a Diplomat, he is very skilled at detecting liars and dissemblers, as well as brown-nosers and suck-ups. In Equus he tolerates a few because they are powerful and he knows they are harmless to him and the royals. And they form a screen to fend off the other gold-diggers. Which, by the way, was EXACTLY the way Rarity was acting at the first party. She cared nothing for him, only for how he could help her.
Earth is a breath of fresh air for him. He is a powerful pony there because of his position, not because of his relatives, and he intends to use it to protect his world. He treats humans at hoofs-length, and ponies with derision. His temporary, at first, secretary is a human. A spy for the government, he knows, but she is knowledgeable of the local (Earth) politics, so he is learning as much about England as the English are learning about Equestria. He especially like Monopoly.

The Weasleys were given animagi forms by Discord. And Discord doen’t like following rules. Unless him following the rules causes chaos.

Why do the portals to and from Equestria behave the way they do? Harry’s portal, after all, doesn’t act the same way that the portal in Equestria Girls does.

It might be a question of the magical quantum mechanics of how the two universes work in relation to each other. Based on how quantum mechanics appears to work in real life, the portal could very well have an extremely complicated mathematical explanation that effectively boils down to "it works that way just because."

Or, as Twilight might say, “The portals operate off of fiendishly complex trans-universal quantum gravitational metaphysics that will take years of study to truly master, given existing knowledge. I can modify the portals, but creating a new one will be a real challenge.” And then Twilight shivers in excitement.

Portals from Equestria to Earth, and back, have a default logic which dictates how they work. Opening one at random will result in a portal that follows those default rules, which is why Harry’s “accidental” portal maintains conservation of mass. He had neither the knowledge nor the power to make a “unique” portal.

The universe Equestria Girls (EqG) takes place in is not the HP universe (people are not rainbow colours in HP). The rules for travel between EqG and the Equus universe are different from those that govern transit between Equus and HP Earth. In addition, the mirror portal is a magical artefact designed and built by Starswirl the Bearded, and further modified by Princess Twilight. The rules that govern its use and abilities will not match those of the default portals from Equus to HP Earth.

Reality doesn’t need to make sense, and quantum mechanics is full of complete nonsensical insanity that is none the less true. There is absolutely no reason why the same can’t be said for this story.

The idea that everything in fiction has to make sense, or immediately be explained, is unrealistic. Life is full of big unanswered questions and unsolved mysteries that we may never figure out. Why should fiction be any different? Can you describe the mathematics behind a black hole in a way that makes sense? The answer is: No, you can’t. The math behind a black hole requires you to divide by zero (0) as the singularity that holds the mass has a volume of zero (0). As you should know, division by zero (0) is mathematically impossible. That implies black holes can't exist. Yet they do. The idea of cramming any mass at all, let alone the mass of a billion suns, into an area so infinitesimally small as to have a volume of zero (0) is preposterous. Yet, at the same time, that is a true feature of a singularity. It makes no sense, yet one exists at the core of our galaxy, and all other observed galaxies. Plus, stars have been photographed moving at relativistic speeds in orbit around it, proving its existence and mass.

The portal could very well be the same way: something that shouldn’t exist but just does.

The animagus transformation is an ability unique to wizards and witches in Harry Potter canon. There is no equivalent for ponies in My Little Pony. There is a spell for changing forms in both (Mad-Eye and Ferret Malfoy, Twilight and Breezies).

Therefore, ponies can’t change into a human without a powerful spell, as the animagus transformation is an ability unique to magical humans. Given how the portal changes any human with any magic into a pony, the animagus transformation does not exist in Equestria as magical humans don’t exist there.

Because Equestria is actually ‘Atlantis’, or at least the basis of the myth, and that wizards are possibly descended from ponies (Which came first? The chicken or the egg?), the animagus transformation is an ability granted by the portal to give humans access to their pony forms. Naturally, there was a mixing of Equestrian magical and muggle DNA (despite what some Pure-bloods claim every wizard and witch alive has some muggle ancestry) back in those times.

For the ancient ponies, and wizards, however, as time passed and they bred with humans that transformation ability became a residual trait passed down from generation to generation much like magic itself. Due to the slow deterioration of magical ability in a low magic environment, accessing the animagus transformation ability has become increasingly difficult. That made the resulting animal form a random species as opposed to ponies, thus requiring the complexity exhibited in HP canon.

That slow deterioration of magical abilities is why there are squibs.

Discord is likely to make them super-ponies, yes (look at Scootaloo), but he is also likely to make their animagus form follow the conservation of mass simply because most of the time the animagus form doesn't follow that principle. It would be unexpected for Discord to abide by any kind of rules and thus him occasionally bringing order to a situation would actually be chaotic.

· Prime Minister: John Major
· Foreign Secretary: The Rt Hon. Douglas Hurd, 1989-95. Conservative, argued against intervening in Bosnian war.
· Home Secretary: The Rt Hon. Kenneth Wilfred Baker, Baron Baker of Dorking, Baker’s mannerisms were unpopular with some people: he dressed his hair with Brylcreem, and by the late 1980s he had come to be portrayed by the satirical programme Spitting Image as a slimy slug.
· MI5: Sir Patrick Jeremy Walker, KCB was Director General (DG) of Military Intelligence 5, the United Kingdom’s internal security service, from 1988 to 1992.
James Wootton, his secretary
· MI6: Sir Colin Hugh Verel McColl, KCMG (born 6 September 1932) was Head of the British Secret Intelligence Service (MI6) from 1989 to 1994.
· Head of Army: Field Marshal Sir John Lyon Chapple, GCB, CBE (born 27 May 1931) was a career British Army officer in the second half of the 20th century. He served as Chief of the General Staff, the professional head of the British Army, from 1988 to 1992. Early in his early military career he saw action during the Malayan Emergency and again during the Indonesia–Malaysia confrontation and later in his career he provided advice to the British Government during the Gulf War.
· Director Special Forces Brigadier Jeremy Phipps, SAS Commander.
· Agent Lewis Carroll, MI5
· Agent Charles Dodgson, MI6
· Colonel Jayson Thiessen, Retired. Special Air Service.
· Sergeant Castor James Searle, Retired, SAS. Activated as Staff Sergeant, promoted to Warrant Officer 1st Class. Wife, Milada Sarood (before marrying). Daughter Thalia Asgre (to blossom, Heart)
As ponies:
. . . Castor is a pegasus with a white-coat, with a light and dark blue mane and tail. His wing feathers have blue tinges to the edges. And he has blue hooves and eyes. Looks like a winged Shining Armor without a horn.
. . . Milada is a pink pegasus with a tri-colour purple, magenta, and yellow mane and tail. And purple wings, hooves, and eyes. Looks like Cadance without a horn.
. . . Thalia is a pegasus with a light-magenta coat; violet, arctic-blue, and light-pink mane and tail; and pink feathers with a dark-pink edging. Her eyes and hooves were a light-opal. A Flurry Heart look-a-like without a horn.

Princess Royal Barracks, Deepcut, Camberley, Surrey (4 miles, 14 min drive) Army Logistics headquarters

So I take it the main story isn't even part of the folder?

This looks good and informative, and serves as an excellent place to set up a general sort of bible/ruleset for things in universe.

That being said, 6741670 I'd like to ask about the transformations being set in stone regarding from human (wizards) to ponies, given the fact that I could swear Ginny became a Pegasus and yet she is a witch who is just a year shy of Ron. Furthermore, if I recall Percy became an Earth Pony, and at the very least Ron is an Earth Pony even though he's old enough to become a Unicorn.

So there's for starts inconsistency there. I also don't recall Molly being listed as being a Unicorn after the thing with Discord. She was a Pegasus and did give chase after Ginny after all.

Not to mention, I feel it's kind of weird to have it tied to age. Why not just have it be random and or tied to their personality?

Wizards and Witches, realized or not, have the potential to make full use of magic, and will be a unicorn in Equestria. As Molly Weasly demonstrated, taking ponish form again after holding it before is no great challenge for a full wizard. Wizards/witches become unicorns.
Toddler wizards/witches will be pegasi, Young children will be earth ponies. At age 11, or thereabouts, the children will be unicorns.

The bit with blueblood makes perfect sense for how you've been portraying him, and is an excellent guide for anyone who has any plans to write anything with him involved with it.

6742492
It may be added in time

6741648
So we know what happens when ponies, changeling and dragons come through the portal but what about the other species? (Eg. Buffalo, Deer, Hippogriffs, Kirin, Abyssinians, griffons) Do they turn into people as well or do they stay the same. Also is the reverse true can people turn into other species beside ponies?

Haven’t gone that far, yet, in world building. Because ponies and other animals talk, but only ponies and changelings do direct magic (the others use artefacts to do magic) I would imagine that any wizard going into Equestria would be a pony. A metamorphamagus might be a changeling, but I’m not sure. As for the other way, Probably muggles with certain special abilities. Maybe.

6750730
Given that Kirin can do direct magic I would imagine that they would become wizards and witches with an affinity towards fire based magic and a unique ability to run across water and given that the Kirin come from eastern mythology their human form would likely resemble people from east Asia.

Also the trio of reindeer from "The Best Gift Ever" would probably be very powerful witches capable of unassisted flight whom Dumbledore would likely mistake to be the Moirai or as we call them the three fates from Greek mythology, though whether or not they could have inspired the fates depends on how old they are and whether they had any contact with the Greeks in the ancient world.

I would think that griffins, hippogriffs and most other species with direct magical counterparts on Earth would like dragons not be changed by the portal though hippogriffs can cheat with their Pearl of Transformation.