I've been thinking about brackets for an inevitable tournament. Obviously we'd have to decide who wins and loses which matches in advance otherwise everybody would want to win. I could see Mina getting serious, fighting dirty, and really getting antagonistic.
She beats Mushashi in the first round. Makes sense. He's comic relief, his power's sensitive sight and she can blind people with her lightcasting, and beating him up would REALLY get Mina some boos, especially if she properly hurts him during the fight. Nothing broken, she's not evil, but still a trip to the nurse's office. It wouldn't be a squash, though. He'd get some cool moves in.
Second round would be Ryuuto. They're on good terms, and her ruthlessly beating someone she's on good terms with would cement her as a major 'antagonist' of the tournament. This would be a very close match that she'd have to win by playing really dirty. Also, if she hasn't already at this point, this is where she manifests her laser ability and can cut through Ryuuto's strings with it (as well as burn him)
Then she'd lose to a girl character. One of the good, cheerful, friendly ones who are fighting serious now because Mina needs to be stopped, like Hana, Natsuki or Chiaki. That would tell a good story, I think.
Yes, this is what I do with my free time.