My time is right now. I've gone through and taken a look at everyone, and Im ready to talk about all of them. First off, Evvie and Sam are accepted as they are. They're the same as they were in the last version, so I see no reason to change them.
Weiss, I think if you take out White, and make purple more clear in your character sheet, you should be okay to go. Please edit your character sheet to include everything Crapton said, that way its all in an easy to find location. If you give some actual stats on the fire and ice and stuff, that would make it even easier to decide. I know you're going just off of what is shown, but making up some stats would go a long way to making a character.
Gravity girl, Im honestly not sure what to do about you. I dont really know how to handle gravity without it being OP in an arena sense, but I also wouldnt want to tell you to use an entirely different character.
Green, I think your character should be okay if you take into consideration everything said so far.
Hanta is good to go I think. Her powers seem pretty reasonable, as long as she has the "Ability to move at lightning speeds" Taken out or reduced. I think a SHORT lightning dash would be fine, but a long range one most certainly would not. Hitting someone moving that fast would vaporize them.
If there's anyone I missed, let me know.