The Conversion Bureau never made any sense anyway, but here are some places where it would have made less sense.
Not necessarily worlds where the ponies would lose the fight - just worlds where conversion wouldn't logically work.

Before suggesting a World, read the index to make sure I haven't done it already.

When the draconequus race left the world, one child was left behind.

This is his story, and the story of the filly who loved him, lost him, and was forced to imprison him in stone to save her people.

Cover art comes from She never came back by Nirac. I have slightly modified this version from the original in that my version of Discord had dark hair as a child, and in Nirac's original the hair is white.

There is now a series page: The Last Draconequus

Progress Bar at my writing journal. Also there is a TV Tropes page and a French translation.

Equestria. On the surface, it is a kingdom of harmony where pegasi, unicorns, and earth ponies live together in peace; a place where griffons, minotaurs, and many other creatures are welcome. However, few know that another race lives among them in hiding.

Fluttershy, the decades old pureblood thestral known as Mistress Flutterbat, was living with her family in Cloudsdale where her parents had done their best to lead the local clan of vamponies in peace for centuries.

While the Princess of the Sun kept a watchful eye on her kingdom, pureblood thestral clans across Equestria went into hiding, disguised as common ponies, for none had the power to challenge the alicorn’s might.

Will a vampony with a good heart and kind nature survive in a world that sees her as a threat?

This story takes place years before Nightmare Moon’s return. The story itself went through restructuring alongside many improvements to increase its quality.

Special thanks to MykeGreywolf for permission to use his art as cover for this story.

List of editors:
Top editor - ShipIsLove ShipIsLife
Secondary editor - Mikemeisers

This story takes place years before Nightmare Moon’s return. The story itself went through restructurization alongside many improvements to increase it’s quality. Special thanks to MykeGreywolf for permission to use his art as cover for this story.

List of editors:
Top proofreaders: ShipIsLove ShipIsLife
Malefactory

Editors: Mikemeisers
Alticron
Seether00 F

On Earth, air is a hard thing to avoid. So when the PER use it to spread a ponification gas, do humans have any hope?

When a wealthy, well connected man's son is forcibly converted, he seeks someone to exact vengeance. The PER targeted the wrong person.

Basically a sequel to a TCB/Shadow over Insmouth story idea I never managed to write up.

Celestia waits alone in Canterlot for the restored Human race to come after her seeking vengeance. Things don't go as she expected.

Not much was known about Rainbow Dash's family life, until one day, her brothers decided to pay her a visit.

Twilight Sparkle has spent months researching chaos magic, developing a new spell to unlock magic nopony has ever experienced before. But when something goes wrong with casting, Twilight finds herself turned into a Draconequus and unable to control her new chaos magic. If she ever wants to be a pony again, there is only one who can help her learn to control her new magic.

Of course, learning from Discord was never going to be simple. And after a while, being a draconequus doesn't seem so bad anyway....

Based on the concept by Lopoddity

Editing by DB_Explorer
Proofreading by Mac349 (Ch. 1-11), Trippy998, Just A Fabulous Cat (Ch. 1-5), Doctor Candor and skysthelimit (Ch. 1-11).

Adrian Parker is a man on a mission. After a strange purple pony from another world shows up at his house, he is determined to forget about it and return to a normal life. But the governments of the United States and the alien kingdom of Equestria have other plans. Will Adrian escape his destiny? Will the Americans convince him to serve his country? Will the Equestrians teach him the magic of friendship? No to all three, but it'll be fun to watch them try.

(Rated Teen for language and brief pony nudity.)

UPDATE: No new chapter this week. Something, something, writer's block, something. Sorry, everypony. :-(

The Elements of Harmony. Six artifacts of legendary power that have provided for the peace of Equestria for over a thousand years. While Queen Chrysalis managed to deny the ponies their ultimate defense, she still lost to a different unexpected surprise in the form of a love-powered shield spell.

However, the Elements won't be so easily denied. Unbeknownst to anyone, they awaken in their vault and cast Chrysalis into another world to teach her a lesson or six about life and harmony.

Stripped of her power, trapped in a form unfamiliar even to a changeling, and at the mercy of the locals, Chrysalis must learn how to get along with others before she is allowed to return to save her hive. And if successful, she may just be allowed to keep her new friend... If he's willing, and if he can survive the drawbacks of being one of the rarest changeling classes ever seen:

A breeding drone.

Join a spoiled rotten queen and a workaholic electrical engineer in the retelling of an adventure that brought them together across the boundaries of space and time. Because sometimes, a little change isn't all that bad.

(Changeling Drone 'Gazer' design artwork courtesy of oFimFiction.net member 'More Dakka')