While the history of the alicorn race is shrouded in mystery, one thing is for certain.
Seven princesses with hearts of light are the last of their kind that live in Equestria.
Finding new strength in the strange weapon known as the Keyblade, they must venture out to several worlds ensuring the balance between light and darkness.

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It's a sort of alternate universe in which characters will get caught in Kingdom Hearts-esque situations.
While there won't be any explicit deaths of characters, there will be some heartbreaking moments, so I'm marking it sad just in case.
My Little Pony: Friendship is Magic and Kingdom Hearts are property of their respective owners. I gain no profit from this. The four unmentioned Princesses are purely fan-made and are not to be taken as sure-thing characters in the actual show.
(If you don't like anything related to ponies and/or KH, please leave as reading this will only give you pain.)
(Rating bumped to Teen due to PG-13 fantasy violence.)