Explosions. Sword fighting. Magic. Spaceships. Angels of the Goddess. Mushrooms. A Pink Puffball who eats everything in his path. Cuteness. Plumbers. Invasion. Barrel Rolls. Taking down armies single handed and living to tell the tale.
A day in the life for Mario, Link, Samus, Kirby, Fox and Pit, a team of fighters known in their joint universe as The Protagonists, all with their fair share of dealing with A LOT of bad guys. But a raid on a Space Pirate base reveals that their rivals - the Final Bosses- have decided that rather than start by conquering their own universes, protected by the Protagonists, they'd rather crush a different, unsuspecting world via trans-dimensional technology.
Unfortunately for them, The Protagonists foil their scheme, only for an explosion to blast everyone to the Final Bosses target destination: Equestria, a cheerful world of ponies where the need for protection seems to be absent. Unfortunately, it seems that the residents are not as harmless as they look.

For several weeks, weird things have been happening in Equestria. Well, weirder than usual. Odd creatures have been emerging from the Everfree Forest, seemingly watching the town of Ponyville. When the strange creatures attack, Celestia sends Equestria's military to Ponyville to help protect the citizens.
The Element Bearers are assisting the citizens of Equestria in defending their homes from invasion. However, the monsters begin attacking on all fronts, and nothing is looking good for the ponies of Equestria.
Luckily, there are some individuals nearby who are plenty experienced in dealing with bad guys. They call themselves the Protagonists.
Everything is about to go wrong, Mares and Gentle colts.

This story contains spoilers for different games in the Mario, Legend of Zelda, Kirby, Star Fox, Kid Icarus and Metroid franchises, as well as for My Little Pony: Friendship is Magic. Events also take place after the Season 5 premiere, so no canon after the opener will be included (although information revealed in those events are fair game).
Edited by the awesome XSomeGuyX
Canon-Checked by BeneathTheShade

Progress Report-
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Tony Stark had everything he wanted in his life. He had his company. He had a carefree life where he could simply enjoy himself and tinker with whatever came to mind...and he was a super hero to boot! He couldn't imagine ever being happier.

And then a rainbow-maned Pegasus foal dropped into his life, and turned it upside down.

Lucky for Tony Stark that the multiverse is much more imaginative than he is.

Part of the PWNY-verse.

Will freely mix several different Iron Man continuities based on what makes the story work best.

This story is a sequel to Sour Sweet Dreams

Since your first date with Sour Sweet, she has been cursing her dad, claiming that he has been completely ignoring her ever since she was diagnosed with her condition. All of that time, you had pretty much written this belief off as one of her delusions. However, after dinner one night, Mr. Sweet suddenly declares that you and he need to talk. What he has to say shocks and enrages you. Even worse, Sour Sweet overhears every bit of it.

Cover art by Kul

(My fourth featured story! - 5/23 and 5/24/16)

This story is a sequel to Sour Sweet Motherhood

After Sweetie Belle agrees to go out with Button Mash, Sour Sweet is asked by the Crusaders to tell them the story of how her romance with you all started... and they won't be satisfied with just, "I was a b*tch and ruined the whole thing. The End.”

(My second featured story! - 4/8/16)

This story is a sequel to Sour Sweet Reality

During a visit to Sunny Flare's mansion, Sour Sweet explains how her anxieties make her feel that having a mental condition means that she shouldn’t have children. As fate would have it, she discovers that she has run out of her medication the very next morning. Deciding to stay home from Crystal Prep and wait for her mother to pick up more, she learns that not all hallucinations are terrifying… especially those that call her “mama”.

Cover art by Kul.

(My first featured story! - 3/22/16)

Twilight and her five friends are transported during a botched spell, across dimensions to... Ponyville, Equestria? But not the same one that they knew. Sitting on a bench is Harpsy and Babar. The Doctoress avoids apples from an aspiring Applebuck. And in a library across town, six stallions join their forces as they try to decipher the appearance of filly look-alikes of themselves around Ponyville!

You’re a shy guy attending Crystal Prep who’s had a deep crush on Sour Sweet for years. One morning, you finally gather the courage to compliment on how pretty she is. There’s only one problem. She doesn’t agree.

After the events of the Friendship Games, Twilight Sparkle decided to leave Crystal Prep to attend Canterlot High School. As she finishes packing up her things, she runs into five Shadowbolts that competed in the games with her. They decided to give her a few words before she leaves.

Sequel to The Crystal Prep Files

After finally returning to Equestria, Sunset Shimmer accepts Starlight's challenge and face off in a magical duel. What's the worst that could happen?

*Taking place during and after the events of Legend of Everfree*

A month has passed since the Friendship Games. Old stigmas are finally breaking down at Crystal Prep but Sunny Flare isn't convinced that these current events are natural. Naturally, she decides to investigate herself.
But upon certain discoveries that she and eventually the rest of her friends uproot, they realize they may have bit off more than they could chew. However, they do happen to know two people who they consider "magical experts".

Edit: I know this is late but I can't believe this story actually got featured. Thank you very much!