First character was a bad attempt at being PTSD-ridden. For a kid that didn't really understand even the vague ideas of shellshock that I do now, that basically meant being over-indulgently emotional. That might've been fine, if not for the fact that he ended up being the plotpoint, the excuse for the party to get dragged off somewhere else when he started feeling bad.
I hate it, and I hate myself for it. Though literally every character I have played since then has been far, far better, it still haunts me that the first game that I played, and honestly the last game I played with more than idle friends, was such a failure because I had yet to learn that sadness does not equal character. On some level, I think it's even turned me off from trying to play normal human fighters again because of how badly I fucked up.