I think being or wanting to be an artist/writer/author is pretty popular. Bonus points if part of them being a successful author is kind of a secret identity if they're not trying out. Among others I come across quite often are:
Teacher (let's not forget sensei)
Cafe or restaurant related. Oftentimes waiters.
Actors...do they count? Though modeling seems to be fairly popular. May or may not be but I know I'm guilty of it haha.
Funnily enough, this topic made me realise my character's don't really have an occupation o<