All characters on Classic Fantasy are pretty out there, they're pretty much the peacocks of comic books. And that applies to all characters, be they main characters, side characters, villains, or even background characters (if I can help it). That said, each has their own style, but I'll limit myself to the characters I've already introducted.
Calliope doesn't dress much, as you can see, and the pieces of "clothing" she does display are meant mostly for style points. The reason for that goes back to her life philosophy: she means to experience life to the fullest, the freezing cold and unbearable heat, the discomfort and all that nasty stuff are a part of life and she doesn't intend on missing on any of it. Not to mention the adrenaline of fighting towering monsters without any sort of protection.
Angelo goes for the magical girl aesthetic. That's pretty much it.