Speaking as an English professor, if I were teaching a grade 10 AP english class, I'd want my students to compare/contrast something that we'd been reading. If you've been reading any literature, like your Greek plays (I think that 10th grade is Classical Lit) or epics, then you'll probably earn brownie points for having treated two characters from two separate works. The previous suggestions seem sound enough, but I'm worried that you might get chapped for not having done any academic sources (example of Aeneas etc. excepted, naturally).
But if the prompt doesn't specify, I guess anything is fair game? If you can briefly describe your readings that you've done, I might be able to recommend something more concrete.