The planet of Chikyu is pretty odd, from an outsider perspective. There are anthromorphic sapients of every stripe and sort, the world president is a dog, its greatest warriors are alien monkeys, the average IQ (outside genius scientists or children) is somewhere below 50, and magic orbs raise the dead. How much difference would adding a pony that barely talks really make?
...quite a lot, apparently. Just ask Mr. Popo...if you dare.
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Dragon Ball Z Abridged crossover
Edit: Cover art by CaioCoia.
On DA: https://www.deviantart.com/caiocoia

Captain Flowers thought it would be just another ordinary day. Be there for his men, keep the fighting to a minimum, and make sure nothing bad whatsoever happened to Church. Just like any other day in Bloodgulch.
And then the little pony appeared and refused to let go of his charge. This was going to be interesting...

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Part of the PWNY-verse.

Another side of the story is being written by cyberlord4444, and can be found here: https://www.fimfiction.net/story/386172/rock-in-the-gulch-analysis-anarchy

Edit: New Cover Art by ProfessorCatPro
Edit 2: Fan art by Cookie_Girl! So adorable!

His father missing, presumed dead...betrayed by a friend.
Lost and alone, Fox McCloud turns to the universe for some sign there's something worth fighting for.
The universe answers in the form of a firebrand from another dimension.
Now his life is turned upside down for the second of many times. Especially when the little filly starts calling him 'Dad'.

Part of the PWNY-verse.

Edit: Awesome new cover art by ProfessorCatPro! Along with ideas for tech pictured in the cover, which will appear in the story.

After the invasion of Canterlot, Tempest Shadow - also know as Fizzlepop Berrytwist - struggled to make a place for herself in Equestria among the ponies she once conquered. Unfortunately, it seemed not everyone could be as forgiving as the Princess of Friendship, and she found it somewhat difficult. She found herself wishing for a second chance at a first impression.

She really should have checked who was listening first.

Worlds and years away, can she manage to grow into a different pony and try to make it home? And what will this wish cost her?

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Dedicated to mastermenthe for fixing my computer problems and getting me back online to write again.

Cover art by the amazing ProfessorCatPro

Red Team had been given an assignment. It wasn't the usual sort of assignment. They were assigned to defend their base 'until further notice'...and then never received notice. All announcements sounded pre-recorded, and enemy assaults were few and far between. The enforced inactivity was slowly fraying the bonds of the team...

...until something unexpected arrived. A tiny creature appears one day in their fortress, in need of compassion and care. Somehow, she finds that in this group of strange individuals, as she becomes their baby.

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Crossover with Team Fortress 2.
Part of the PWNY-verse.

Edit: Since I get these comments a lot, I will say here, I've never played the game and don't intend to include much in the way of game mechanics, so please don't suggest such things.

Edit 2: FAN ART! for chapter 9 by G_Haze. Makes me so happy.
Edit 3: More fan art from G_Haze, This guy's amazing!
Edit 4: New fan art! by The Pyromanecer. Thanks so much!
Edit 5: More fan art by shiningkord98.
Edit 6: New Fan Art by The Pyromancer
Edit 6: More awesome fan art from G_Haze! So awesome!
Edit 7: New fan art by Pioneering Author

After a month of being missing after a magical mishap, Spike has returned to Ponyville. However, he's not the adorable baby dragon everyone remembers.

Now a well fleshed out drake, and garbed in armor the likes of which ponies have never seen, he walks with caution, grace, and absolute confidence. His eyes show wisdom beyond his years, but he has trouble remembering details about his friends. But he returned with a purpose.

He also didn't return alone.

One thing is certain though...he has a story to tell. That is this story.

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MLP/Metroid crossover.
Part of the PWNY-verse.

Edit: Now with cover art by DavieRocket.