Mister Lopez

 is a suicidal resident of Rivet City he can usually be found on the bridge tower.

He can be enslaved with the slave collar.

Unmarked quest: Suicide Watch
Lopez considers committing suicide. You can either push over the edge (even literally if you want) or help him find a new purpose in life. To do so, be on the deck of the ship at 3pm.

Appearances
 only appears in Fallout 3.