| fragnar0k |
I've never had this happen to me, but it did happen to a friend of mine very recently in the game I'm running. He was a wizard, who's motivation in the party was service to the party's leader (a fighter). The group met many hardships in the underdark, and the fighter apologized to the mage for putting him in the way of more danger than he'd ever expected, and released him from his service if he wanted to. When they reached the surface, the wizard had no in game motivations to stay with the party at all, and he left. He rejoined as a slightly lower level character under different circumstances later.
Assuming nothing like that can happen, consider this. Almost all of my characters start out iconic, and very set in their ways. I only ever had one character that stayed that way (A Jedi in a star wars game, which was really fun to play), the rest all slowly changed over time. As they experienced the real world, and grew in levels, they changed their perspective over time, many times more closely matching my own, as it is my out of game perspective of things that dictates what they perceive, in a sense. I'm not talking about metagaming here, I'm talking about the unavoidable fact that our characters are influenced by the way we think. So slowly over time, my characters change and grow, and I always have fun with the result. And I think that's the pinnacle of role playing.
So let marcus change and grow with new experiences. Just because he's stalwart and set in his ways now doesn't mean he can't ever change.