Well, any Fan Fiction, really, as long as there's not to much 'adult' content. Violence is fine, but other... Things are not (if you catch my drift). I'm also more likely to do a review if I have read the cannon series that the Fan Fic is about (so stuff like Harry Potter, Twilight, and Pokémon), but that's not a requirement. Also, the format I'm doing the reviews in makes it so that it cannot be a choose your own adventure story, it has to be one story.
Oh, and if aanyone asks me to review their Fan Fic, be prepared if I think it's no good. I'm writing for a comedy website, so I will be making jokes that may sting a bit, and I will probably overreact to things. But, underneath all that, I will pu valid,c obstructive criticism.