Lieutenant

The Lieutenant or Lou, also lovingly dubbed Lou Tenant, is the Master's right hand and the overseer of all work inside the Military Base. Lou is a good example of how the Master would want his mutants to turn out, more intelligent, stronger and generally better than normal humans.

The Lou's authority apparently stretches so far that Harry goes through the trouble of dragging you on a long journey through the Wasteland just to show you to the Lou and report you're not a ghoul.

Other than the Master himself, Lou is the best source of information about details concerning the Vaults, super-mutants and the general grand plan of his boss.

He appears to be a rather sadistic character who thoroughly enjoys torturing the PC, as well as arrogantly self-assured concerning the superiority of Super Mutants over normal humans and Ghouls.

He is mentioned in the Richard Grey Audio Diary, where it talks about him becoming a truly intelligent mutant, and why mutants were so stupid when dipped in the Forced Evolutionary Virus. High radiation count...

Attributes
The Lieutenant is noticeably tougher than standard Super Mutant soldiers. He has about 250 to 300 hit points, and is equipped with a Gatling Laser. He has several cybernetic augmentations (including a bionic eye), and also appears to be wearing metal armor custom-made for his Super Mutant bulk. He has a unique death animation in which he literally falls apart after being killed.