Shantae is the Titular character of the series of action games of the same name. She fought Filia of Skullgirls in an episode of One Minute Melee.
Fanon Ideas so far
The first Shantae game, released on Game Boy COLOR on the turn of the Millenium, despite well received reviews, had poor sales due to the release of the Game Boy ADVANCE in 2001. It wasn't until the LONG-AWAITED sequels to the game on the DS series of handhelds, has Shantae shown it's true successes.