Chopper would be awesome as a character. Different modes (horn point ect) His defense would be so funny (the furry ball) and for his specials/7piece RUMBLE BALL!! :3
Ultiamate stars had some more characters from one piece; Sanji (awesome) and nico robin.
Yh Definatly add those characters from bleach and naruto, it would be fun to play as some of the captains/kisuke/arrancar too though. They should put in some claymore characters as well (SJ advanced) those characters are brilliant and would offer some eye candy In naruto I'd definately like to see playable neji and lee (youth has no limits *ching*) and possibly some sanin
Theres such a multitude of characters that could go in.