Champions has a really mad level of customization really.

100s of costume pieces for each body location you can customize, of which there's about thirty, each of which can have custom colours

All kinds of different auras which can be either always on or on in combat tyo customise the visual effects

And if you're a subscriber you can change the visual effects of your powers as well, whether come from hands or head or chest or whatever and what colour they are.

If you have a weapon-based power set there's all kinds of different weapons you can choose to.