oni-fan

The type of fan who's intrested in only ONE character (usually because they find them attractive) and hate the rest of the characters in the same work/franchise.

-Hey, who's your favorite character in this game? John? Thomas? Alice?
-Idgaf about neither of them, I'm only here for Nolan, he's like the only person I actually enjoy watching
-Ah, so you're oni-fan then