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
The Courier can give him various drugs (jet, psycho, etc) for 20 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.