Hmm well I don't write him too much, but I do try and draw him a lot. What I always try to convey is a person who has a strong since of self(at least when he's an adult). I think he's less likely to have his opinion changed by peers and also. He would fight for his opinion, but perhaps not as openly as Serious would. He's the quite objector, who shows displeasure more from action or lack there of then out right confrontation, if he can.

I think as people have said, he's middle of the road. His dominance depends on who he's with and what battle he's choosing to pursue. I think he would be less likely to stand up to Dumbeldore or Sirius, but he would to Molly, or err most everyone.

I guess he's not by nature submissive, but if the other person has clearly denoted some form of seniority (as with Dumbeldore) he will not openly opposse them unless they ask him something that violate his sense of morals (and those are a whole other back o' worms)

I guess basiaclly he knows what authority he does have and stays within that box, as for as who he's going to be aaggressive around.

I think an older Remus is actually much more likely to talk back to or argue with Sirius than he ever would ahve as a child. I see him as much more submissive when he was in school.