Actually, not much of anyone! Ace is possessive, but there are few people that he views as a Serious Threat to his relationship with Zero. He gets jealous, yeah, but not overwhelmingly so, and generally chalks it up to Zero being Weird and Protective and that having lots of friends is just how he is. ...Though, now that I think about it, Drift is starting to edge into yandere button territory. Whoops! :Db

Who is Zero's favorite person in Aather other than Ace and why?