Colin Moriarty

Colin Moriarty is Megaton's crime boss and the owner of Moriarty's Saloon. He has a computer which contains valuable information on the game's main quest. To access the information, you can either pay Moriarty for it, get the info from a prostitute working for Moriarty, or convince Gob, the ghoul bartender, to tell you how to access his boss' computer.

Appearances
Moriarty appears only in Fallout 3.

Behind the scenes
He is probably a reference to Professor James Moriarty, criminal boss and arch-nemesis of the famous fictional detective Sherlock Holmes.