Mario Street Fight sprites
I recently ripped the sprites from the Flash game Mario Street Fight, which is essentially a Mario-ized version of Street Fighter and King of Fighters. This sprite pack includes all four playable characters (Mario, Luigi, Peach, and Toad), as well as all effects and hitboxes used in the game.
Gameplay screenshots of Mario Street Fight:
Download the sprite pack here: https://www.dropbox.com/s/i7asm7oerizfe0g/mariostreetfightsprites.zip?dl=0