Up for any of these:

Teacher/Mentor x student
Step brother x Step sister/brother
Twins
Prince x Prince
Knight x Mage

I only generally play male characters. I can play female side-characters, but I'm not particularly good at portraying a female, I just don't do them justice XD

EDIT: Also interested in the Pokemon and Fable fandom pairings.

EDIT AGAIN: I like chocolate cake and apple pie.