Michael Silverbane
Adventurer
But if the group is playing a more traditional fantasy game, where Trolls are feared and pretty much killed on sight (or you run away on sight), then it would be pretty lame to have a Troll in the adventuring party. My first thought would be, "Who the hell are the guys traveling with a freaking Troll?" And if some how a group of guys would travel with a Troll, that doesn't mean NPCs are going to be ok with it and never react.
I played a troll in a fairly typical fantasy campaign. People mostly treated him like a very dangerous animal, much like people would treat a druid's animal companion or a wizard's familiar.