He wears a yellow robe with blue trim. There is a hood that extends over his head making it impossible to see his face. The sleeves extend down past his hands. The robe drags on the floor. Basically you can't see anything but a robe.
As has been already pointed out, that's a bit too close to Nemo's look, but I think I can get something that matches the concept you've described. That's not your fault, of course, since it's hard to tell what Nemo's look is currently, but that will change shortly.
Maybe we should leave the two groups permanently separated?
I'd prefer to keep it more of an open world, to be honest. When I originally started the campaign, I only had a few scenarios in mind: taking the Farm, taking Sunshine Dale/Dis City, exploring the Ruins, and defending Dis City. When I started, I honestly thought that would have been a logical stopping point for the game, since most forum games tend to wane over time.
I think that, going forward, having more, smaller encounters that the groups can split up for, and large-scale battles that everyone is present for, seems like it would make the best combination. Besides, the composition of the two groups right now aren't nearly optimal (2 healers in 1 group, none in the other, for example), so there must be at least one convergence before we split off again.