Motor-Runner

 is the leader of the Fiends, located in Vault 3 in 2281.

Background
He is found in the maintenance wing with his two guard dogs, BoneGnash and GhashBone.

Other interactions
You can give him various drugs ( jet, physco, etc ) for twenty caps if you pass a speech check at the entrance of Vault 3 when speaking to the Fiend at the door.

Appearances
appears in Fallout: New Vegas.