What I really like about this is quirky character animations - With the three on three battles it'll difficult to spot them out, see gaps and work your advantage. I'm a big fan of that!
If the game is going to have 3v3, perhaps you should include a character with reversi powers? So when he/she gets hit, the other player are damaged, but if they hit the other players, they themselves are damaged. Have it so this character is constantly punching or attacking on a timer, rather than input by the players. It's a stupid as heck idea, but something.
