Michael Masters

 is a ghoul residing in Warrington Station. He lives with Roy Phillips and Bessie Lynn. They are all trying to find a way to break into Tenpenny Tower, so they can live there. Most of the Tenpenny Tower residents discriminate against Ghouls, they do not let anyone like Masters into the building. In the Tenpenny Tower Quest the Player Character can try to convince the residents that ghouls are not bad. Notably, he shares the quote 'I don't want to waste bullets on your sorry hide' with Lucas Simms of Megaton. Both NPCs greet the player upon their arrival and will turn hostile if the player chooses appropriate dialogue options.

Background
Before the Great War, Michael was a scientist. He claims that they were making real scientific progress, but people got hurt while doing so. "And then those goddamn bombs fell."

He also says he used to vacation in Tenpenny Tower.

Shop
When you first meet him at the Warrington Station, his inventory will be mostly random junk. If you let him and the Ghouls enter Tenpenny Tower he will take over Gustavo`s and Lydia Montenegro`s shop, meaning he`ll sell weapons, ammo and junk, with a rather big discount. It is worth noting that you can buy a Dart Gun schematic from him even if you bought one from Lydia before. His references to his early work where he claims he and his fellow scientists were making "real progress, but some people got hurt" could mean he was once an employee of West Tek.

Appearances
 only appears in Fallout 3.

Quotes

 * "Karma's a real bitch, you'd be wise to remember that."
 * It may be a reference to the in-game Karma system. It may be that Michael is warning you to consider your actions.
 * "I don't want to have to waste bullets on your sorry hide."
 * "I wasn't always like this. I was a goddamn scientist. We were doing great things. Amazing things!"
 * "Go live your life, kid."

Bugs
If you decide to kill all the residents and let the ghouls move in, when you walk into tenpenny tower you may see him walk towards the door and then walk out. If you follow him he will walk towards the main exit then disappear when he gets to the potted plants, and you will hear the sound that happens when you go through a grate. If you search Warrington station he will be nowhere to be found.

I had the same problem, it seems to happen if you never enter Warrington station, like when you first see Roy, you can follow him and when he gets close to the station you will be able to talk to him. Then I went on to let the ghouls in and the bug happened.

NOTE: If you kill Michael Masters before you end the Tennpeny Tower quest with good karma, you can't buy from Lydia Montenegro's shop. Meaning, you can't buy anything for your Tenpenny Tower house.

May not be a bug :He, unlike other ghouls has human eyes instead of ghoul eyes.