Where Kamui is concerned, Fai has the misfortune of being pre-angsty-tiems. Since, well, Fai is the reason Kamui is in prison. Sort of. Not that Kamui actually holds it against him -- he blames Kurogane more -- but he can't forget it. And Fai doesn't even have the decency to be vampired, so he can at least have that odd connection. Add in the fact Kamui's cranky to most people, Fai's probably never going to win. D: