Lonesome Dreams by Lord Huron is another song I've started associating with Rumarin. The narrator describes traveling through a beautiful but lonely world "where the only souls I see are ghosts"; it feels like something Rumarin might experience when he's alone in a land that's new and unknown to him. I believe he came to Skyrim to run away from his troubles in Cyrodiil, but the ghosts of his old life still follow him.
I see Rumarin as a lonely person. Even when he has companions, he keeps them at arm's length and never lets them know who he really is. Ask him a question, and you're lucky if he gives you a real answer; most likely he'll
deflect or make a joke. At first it seems all in good fun, but sooner or later people begin picking up on the pattern. They start finding Rumarin tiring, annoying, or even suspicious. Eventually they go their own way, and Rumarin finds himself alone once again. Rumarin knows he's trapped in a cycle of his own making, but he doesn't know how to break out of it. Sometimes he's not sure if he wants to.