Used to be a part of the brotherhood of Makuta, until he was betrayed by Makuta Heloz and left to die. Because of this, he has sworn revenge on the brotherhood. He is charming and intelligent, but will stop at nothing to achieve his goals.
The Nuva Shoulders don't really go well the way you've put them. I personally think you should have added them to the uppermost part of the legs as hipguards, or to the arms as shoulderguards. Other than that, though, the MOC is nice.