There was a savestate editor that allowed you to change your characters and their stats, you can find it here if you want to try it out:
: I remember in other patch of another nes game
: about dragon ball z you can control vegeta,
: so in this patch maybe you can do the same
: control vegeta instead of the cpu
: Could you do that too or is imposible for
: this game?
: in this page the authour says you can
: control vegeta for this game but what about
: this one that's could be great.