Previous goals unlocked Squigly, Big Band (with their own storylines and stages), and additional voice packs. Also unlocked at $725,000: a free copy of the Skullgirls "Z Engine" for the Fighting is Magic team, and another character, Robo-Fortune. At $825,000, another new mystery character will be added as DLC.
The "mystery character" or characters will be determined through a voting campaign by backers. There are ... 32 different choices.