I like the idea myself. It'll just need more brainstorming on balance, since it's quite a powerful niche - you're picking two characters, essentially, for the price of one, with the awesome advantages of MK's support system that get applied to a degree. For characters, Jess is a no-brainer, while Flay... hmmm, I keep thinking Nikki would be a stronger fighter than him, but he has recognition and even better damage. I'd like to see Roxis, since his turn-shifting gimmick is neat, though.