Wow, that dictionary definition told me everything I wanted to know. I have dictionaries too.
So does the superhero have to be strong (physically) - I suppose that's what we usually see him as. Of course, he's always strong mentally. So he/she is tall, muscular and defends the world against evil. He/she is brave, "great" and
affecting an attitude of disdain or conceit; haughty and supercilious.