So we have 6 people (including me) and we rotate between me, problem player, and PP Friend.
It's not a role issue, it's exclusively a motivation/goal/plan problem. It's a constant feeling that his feelings and hangups are the guidelines we have to follow.
For instance, our team currently consists of: Neo-anarchist mercenary sniper (me), Hooding phys-adept cab driver (PP), Street Shaman (PP Friend), Mercenary Troll, hobgoblin hacker, and ex-civilian doctor blackmailed by triads.
We (gob hacker, me, doc) want to solve the triad problem, PP just continues to talk about building this false company that the neo anarchist and Hob Hacker want almost nothing to do with because if we wanted to work for a company of any kind, we'd have joined a company.
But anytime I try to have any sort of opinion or personality, it sort of just goes "oh yeah, I get that. But we are gonna do this."
The table is usually split, but character wise doesn't really have the opportunity to do much. What's worse is on the rare occasions where we strong arm him into giving up what he wants to do, he sort of just sinks into his chair and poit's and detaches.
A lot of the table just give in to his fits and let him run amok, myself included. I haven't been interested in what's going on with the game in the last 3 months. Usually when I get sick of trying I put a character on the shelf and pick up some genetic troll/orc muscle and just go "sure, whatever you want. I roll X"
When I gm, his friend seems to counterbalance him. But it's like the rest of the table doesn't have that level of respect, and his friend won't reign him in as a gm because they're friends and tend to feed off of each other.
So in the last seven years, the only time I really get to play a character is when PP is a gm, which he is sick of doing at the moment.