The opposite, in that all of them are guys with negative color palettes from hers? Or just that they act the opposite? I'm thinking a fair mix of guys and girls; The main cast of characters doesn't have to look like humanoid monsters, at least not at first (likely because she's giving them a chance and even acknowledging them). Maybe they can suddenly morph into the monsters if she decides to kill them.
OR maybe they DO look like monsters at first, but slowly start to look like a normal person as she starts warming up to them.