Rune was found prowling about by Tala, who coerced him into joining up with Garm. He currently is not happy with the situation, as he feels much more inclined to be a lone wolf. But for now, perhaps this could work...
In personality, Rune is prideful and keeps to himself. He is deeply intelligent and agile, making him a valuable hunter. Some times he's caught kills strictly for himself, but Garm seems to wind up finding out anyway...
He's the youngest one of the pack so far, so he tends to act up and needs to be put in his place more than Garm would like. Their other pack mate, Freyr, is a bit more understanding and tends to let him off easier than Garm does.