I actually built my character around their powers, so like Tech and Science toons were more robotic and smooth with the technological and natural feeling powers such as Willpower, Claws, etc.
For Mutants and Magic I generally made them have an organic feel, especially with the new costumes they added (the Bioluminescence I think)
And for Natural, it was a combination of Tech/Science with generally casual clothing, like Back Alley Brawler.