Rocksalt

 is a Raider in Tepid Sewers, it appears that he is not relevant to any missions or quests in the game itself.

Although there is no given story it seems that Rocksalt is the leader of a small sect of Raiders living in a mole rat infested sewer. Rocksalt drops Rocksalt's key which opens a safe, ammunition box, and a number of other small toolboxes.

Apperances
 only appears in Fallout 3.