LogFAQs > #954211650

What about when he stole Duo's Gundam parts after Duo helps him? Duo has a mission too and. He also jumped out of that hospital window and waited to the very last second to deploy his chut. The first act he constantly displays anti-social behavior.

I'm not saying he has displays these through the whole show. As you get into the back story, his motivations become more clear. After he blows himself up he also goes around to the family to atone for his mistake. There is a noticeable behavior switch after that, and it's moved even further once he starts using the Zero system.

I think it's unfair to use his mission as an excuse for his behavior, considering Duo and Quatre seem to have no problem working as a team, and not being completely closed off, and not coming off like a sociopath. I will admit Wu Fei has these characteristics way more than Heero, and Wu Fei doesn't really grow much as a character. His whole arc is around beating Treze and being a loner.