Please please please please please don't use descriptions of a person instead of their name or pronouns.
Examples:
"Superman was tired. The last son of Krypton sat down."
"Hermione shook her head. The bushy haired genius couldn't believe her friends weren't taking their studies seriously."
I see this less these days, as it seems to be a byproduct of learning to write from fanfiction circa 2005, but it still irks me. I don't care if the fic is made of chocolate, and that I'll win $100,000 if I finish it. If it has this in it, I'm out.