[quote=@Chairman Bao]
In other words, I don't think I have it in me to make a purely nice, altruistic, sympathetic character that bonds well with other people that doesn't have a dark psychopathic side that also wants to harm someone. I would pass out from the boredom.
[/quote]

Stories like these often work very well with protagonists who aren't purely heroic, but are motivated by other means. Maybe he could have a mercenary mindset, willing to work with others as long as the pay is good? Or a challenge oriented mindset that cares less who he works for, or with, as long as an employer can provide him with strong opponents to fight? Things like that would make it possible for him to interact with other players and the plot without supporting the same ideals or getting ganked, and could make for better character conflict when those ideals clash verbally. Or maybe talk to other players about interweaving the revenge plot, so that his reason for being around is something like "they have clues that I need, even if I hate their guts."