An 80-year-old Englishman turned American entrepreneur, the man who discovered the tower saw it as an opportunity to provide residents with a standard of living enjoyed by the affluent in the days before the nuclear Armageddon. A rich eccentric who's bored with life and looking for new challenges, he enjoys sniping at Wasteland creatures, Ghouls, and the occasional visitor from his suite atop Tenpenny Tower.
Tenpenny is a recluse, never leaving his penthouse suite, although it is mentioned he has a seat reserved in Margaret Primrose's cafe.
He carries a sniper rifle which he uses to shoot at things in the wastes during what he calls a "Wasteland Safari."
He sits on his balcony, enjoying the view from his tower, bothered only by a certain "eyesore" on the horizon. He also seems to enjoy drinking whiskey, smoking tobacco and playing chess, all indicated by the nearby whiskey/shotglass, cigarette pack/ashtray and chessboard.
He orders his daily meals from Margaret Primrose, ordering an "Iguana bit sandwich, no salt, with a peeled pear on the side". Allistair also has a private seat in the corner of Margaret's cafe, as explained when you first meet Margaret.
The Power of the Atom: The player can stand on Tenpenny's balcony with Allistair and Mister Burke and together witness the destruction of Megaton in a nuclear explosion. If you choose to blow up Megaton for Tenpenny and Burke, Tenpenny will give you a suite in the tower.
Tenpenny Tower: The player can convince Tenpenny to give his permission for the ghouls to move in. If you allow ghouls to move in, Roy Phillips and Tenpenny will have a "disagreement" and Tenpenny will have an "accident", which results in Tenpenny's body being stuffed in a storage closet.
Slave Hunt : Tenpenny is the former owner of Mei Wong, and is mentioned in this unmarked quest.
Allistair Tenpenny came to the Capital Wasteland from Great Britain to seek his fortune, so that alone tells you that the U.K. was also hit in the war. And if he came to U.S. to succeed, that says a lot about how screwed up Europe must be. So we just allude, a little bit, to the state of the rest of the world. We like to leave a lot to the players' imaginations, and somebody like Tenpenny serves as a catalyst for those thoughts.