prosfilaes
Adventurer
Years ago I had my character do something that I felt was completely the right "in character" thing to do - it resulted in a near TPK and the end of that particular campaign.
In retrospect, my character's death would have resulted possibly in a TPK, and almost certainly the loss of more characters in the battle later that night, if the DM didn't reduce the battle.
I have since decided that there are many ways to be true to a character concept - and that the ones that have the least chance of messing up someone else's character are usually the most fun for everyone.
I can't do that. I really enjoy roleplaying when I know my character, where I'm not considering what my character concept might do, instead I'm doing what my character would do. It has to flow. When I'm creating my character is when I need to worry about not messing up someone else's fun.
This was fun because it was about the first time in the campaign when I wasn't trying to figure out why/how my character would do what my character had to do for metagame reasons, or engaging in purely tactical decisions, but actually doing what I knew my character would do in that situation.