Nashoba is like a mentor, someone you can go to for advice, and is much more approachable than his brother. He spends much more time amongst the tribe's people, and is a fair man with a very 'innocent until proven guilty' attitude.
He wears more decoration (a breast plate, wolf totem and necklaces) as his position is more ceremonial than the Alpha's, who is an active leader. All this also associates him more with the Chief and the Elders, who also wear decoration, making him the tribe's link to the 'wolf-warriors'.
The ranking tattoo on his arm shows his status as being below his brother, but higher than the other members.
Nashoba is Choctaw for Wolf, he is roughly 38 years old and his likeness is based on a very young August Schellenberg (Randolph from Free Willy, and Sitting Bull from Bury My Heart At Wounded Knee.)