The grandson of the founder of Junktown and son of its previous mayor,[Non-game 1] Killian Darkwater spent time in his youth travelling with caravans but eventually settled down and opened "Darkwaters", a general store in Junktown. Killian took on the role of mayor of Junktown following the death of his father, which the public generally approves of citing him as a hard and strong man that acts fairly and will protect Junktown as best he can.[Non-game 1]
As a leader, Killian is hard on crime and shady practices with a focus on Gizmo and his casino,[Non-game 1] though he is not above making deals with local gangs to help keep the peace. This attitude has earned him the ire and wrath of Gizmo, who believed his casino was the only reason Junktown was prosperous following Killian's rise to the position of mayor.
"Well, there are two kinds, the Khans and the Vipers. We usually don't get trouble from the Vipers, and a few of them actually pass through town. The Khans, though, they're a mean bunch. They think they can conquer the world, or some such crap."
The random number of bottle caps in his inventory will reset any time a game is loaded or upon entering the area.
After talking to him for the first time - when Kenji enters the building - Killian's inventory changes. The exact details vary, but he will always have a new Desert Eagle if the first one was bought or stolen from him.
Killian's dog tags are lootable from his corpse, whether or not Gizmo requested them for the proof of death.
Killian bears a very strong physical resemblance to his voice actor.
If caught picking any locks in the store, he will stop the Vault Dweller. Entering dialogue with him after that puts the Vault Dweller in Junktown's jail.
The dog tags Killian wears most likely belonged to his grandfather, who was a soldier.
↑The Vault Dweller: "So you pretty much have the run of the town, eh?" Sherry: "You bet! Nobody messes with us! Well, except for Killian, but he's cool and all. He's like the sheriff man. We do whatever we want." (Sherry's dialogue)
↑ 4.04.1Killian Darkwater: "Where've you been for the last 100 years? In a closet? My father used to tell me stories about the War. His father was a soldier before starting Junktown." (Killian Darkwater's dialogue)
↑The Vault Dweller: "That's a pretty long trip." Tycho: "Yeah, it was. Decided to take it easy for a while. This place shows some promise, just as soon as someone cleans up some of the scum." The Vault Dweller: "Why don't you?" Tycho: "Not my place. I'd rather not cross Killian, after all. He'll clean up this town when he gets around to it. A good man, mark my words. But watch out for that fellow Gizmo. Reminds me of another fat freak my father told me about back in Las Vegas." (Tycho's dialogue)
↑The Vault Dweller: "Who's your boss?" Sinthia: "Gizmo, of course. He runs all the sin in this town. Killian sure as hell wouldn't put up with me or my kind. If it wasn't for the fact that I make Giz a whole hell of a lot of money, I'd have to do other things to him." Sinthia: "And, honey, those thoughts just don't do my stomach a whole lot of good.." (Sinthia's dialogue)
↑The Vault Dweller: "So, what keeps you lawboys from just busting Gizmo and the Skulz?" Lars: "Got to do it all proper like. We know that Gizmo runs a rigged operation and all, but we need hard evidence to bring him down. Same with the Skulz; they rough someone up, we bring one or two of 'em in, but nothing changes. We just don't have any direct evidence tying them to any of the killings or muggings." (Lars's dialogue)
↑The Vault Dweller: "You're right, I'm sorry. So let's talk business." Gizmo: "All right, [Gizmo snorts] here's the deal. Junktown, it ain't what it used to be. The only reason it's still here is because of my gambling establishment. Even so, Killian's been breathing down my neck, and I'm starting to take it personal. [Gizmo snorts] And that's where you come in, slick." (Gizmo's dialogue)
↑ 1.01.11.21.31.4Fallout Official Survival Guide p.91: "Killian Darkwater: One of the Good Guys" "Killian is mayor of Junktown and owner of the General Store. He is also head of the local guard force, and a thorn in the side of Gizmo, who would like to see Killian eliminated. He is tough and strong, a decent man who hates bullies. Though not a violent man, he will fight to the death to protect himself and his town. Knowing that Gizmo is trying to kill him, he always keeps two guards outside the door to his store."