Cinderella: despite the long hours that she spends slaving for her nightmarish family, she spends her nights on secret missions for "The Godmother".
Obviously she's a super hero, because the girl doesn't need any rest!
"She started with several hours of training. First, a series of bodyweight exercises, which had long ago become far too easy without only using one hand or arm."
Of course -_-
"Next, she put her body through a test of the fastest martial arts her legs and wrists could muster. It wasn't until she sweated out the fire from her dreams that she felt like herself again."