Seagrave Holmes was born in 2247. Now aged 30, he is a genius tinkerer and fixes anything he can get his hands on. He spends his days in the shop, and at night, he hangs around the Weatherly Hotel to talk to Vera Weatherly, who he's not-so-secretly in love with. Seagrave has that easy way of relating to common folk. He fits into their social world without even thinking about it. While he is exceptionally gifted with machines, he never lords that over others.
In his shady past, he used to do business with the slavers of Paradise Falls, but now he merely runs a general store in the marketplace called "Rivet City Supply". According to Doctor Preston's terminal, Holmes suffers from a chronic case of red-lung from all his repairs below-decks.
Seagrave is generally to be found in his shop or (often on the flight deck), trying and failing to woo Vera Weatherly. He can also be found leaving his room, (mid-deck next to Marketplace entry) around 2-4 am. The Lone Wanderer can overhear that she does not want to be with him as he reeks of sewage.
The Wasteland Survival Guide: If you are working on the Wasteland Guide quest, he is one of the persons to talk to in finding out the History of Rivet City. If you go speak to Vera Weatherly about Rivet City's history she will direct you to talk to Seagrave, and if you then speak to Seagrave, his speech makes it obvious that he has a crush on Vera.
Council Seat: Bannon mentions that his council seat is being contested by Seagrave. He wants you to look for incriminating evidence against his opponent.
If you ask for a recommended place to get a drink he'll recommend the Weatherly Hotel, unlike most other characters who recommend the Muddy Rudder.
He claims to have everything in the wasteland, but the player can mock him by mentioning the T-51b power armor and asking Seagrave if he has one (this still applies even if you have never seen any suit of power armor, making it odd how The Lone Wanderer knows about power armor).
pcxbox360ps3 If you sided with Bannon during Council Seat, then his dialogue changes. His quote before his trade interface is "After what you did? Only because I have to." His lips do not move during 'After what you did', but they do for 'Only because I have to'. [verified]
xbox360 Seagrave can disappear from the ship, not to found on the ship or at his shop. [verified]