I think he likes the concept of the yeti because it's big, scary, brutal. Basically let me sum up what's going on in our adventure thus far (as up to this point he's decided on a half-orc barb named Bosknir.)
He woke up in an orc encampment with a welt the size of a small melon on his head, baited a guard near his cell and with a few successful checks worked out of his rope binds and strangled the guard against the bars of his cage.
Then he snuck around the encampment and located his gear, pushed the guards body into the cell, and slept in his chair. Morning came and a guard came to take the other's shift. A short brawl ensued that ended in a brutal decapitation and another guard added to the cage. After which, in broad daylight with a horrid sneak check, he made a run for the gate. Orcs from pretty much everywhere in this encampment were chasing him and firing arrows. He mowed over a guy with a tower shield and booked it into a forest, constructing a few traps behind him to cover his steps. After about an hour of walking he happened upon a field where down the edge of the forest a dirt road was found; and a caravan a ways off.
An hour of walking later he was halfway to the caravan when a low rumble surged out from the forest. Almost one-hundred orcs were chasing him down (reason being, which he found out later, was that the orcs found him knocked out cold on an altar about to be used as a sacrifice for a demon summoning, so they assumed he was magical and could give them powers). He ran as fast as he could to the caravan and as he reached it a Wizard and his two body guards introduced themselves and turned to meet the horde.
The field was on fire, many orcs died from that alone, but roughly ten of them made it to the party and a battle ensued. Good rolls left many injured but none dead within the group and our hero joined up with the wizard until he reached the next town (the wizard sells scrolls).
Now he's partying up with them, signed on by cursed contract, as a guard. Things seem fine but he's always talking about how he wishes he was playing a yeti... I'm just not sure how to fit it in.