Definitely would do Kingdom Hearts; you can't go wrong with Sora and Roxas.

Ouran Host Club: Tamaki, the Hiitachin twins.

Tales of the Abyss is an anime now, so that might be an idea. Luke and Asch would be good choices for that one. As would Tear and Jade.

Full Metal Alchemist: Just about anyone would sell, I think, but Ed would be best.

And those are the only ones I can think of. I'm not really into anime that much anymore.