Seagrave Holmes

 is a merchant in Rivet City who runs Rivet City Supply in the Marketplace. He is a relation of founding Rivet City Council member Annette Holmes, and deals in random junk and weapons. Seagrave is often found (usually on the flight deck) trying and failing to woo Vera Weatherly ("I know I'm not a sophisticated man, but I'm still a man!"). He'll also recommend the Weatherly Hotel when asked where to go for a drink, unlike most other characters who recommend the Muddy Rudder.

Unmarked quest: Council Seat
Bannon mentions that his council seat is being contested by Seagrave. He wants you to look for incriminating evidence against his opponent, which can be found in Seagrave's room (under the bed, leaning against the footlocker). The key for the room can be pickpocketed from Seagrave.

Seagrave's room can be unlocked quite easily, it is an easy lock.

Once you have obtained the evidence, you have to side with either Bannon or Seagrave Holmes. Denounce the other to Lana Danvers and collect your reward. If you complete the mini-quest in Seagrave's favor, he will grant you a 10% discount on what he's selling and will buy what you're selling for 10% more. If you turn in the evidence, you will receive a permanent discount with Bannon. He will also reward you with Schematics - Deathclaw Gauntlet and you will neither lose nor gain karma.

Seagrave's room is on the middle deck, just at the right at the top of the short stairs from the market area.

Lana Danvers is known as Commander Danvers and is usually somewhere in the upper tower decks.

Bannon of course only sells crappy clothing and basic armour, so the discount is pretty useless. He does have stimpaks but you should be able to get them cheaper elsewhere even with the discount. You can make some caps by buying his cheap clothes and selling them, but you are talking 2 - 5 caps dependent on the item only. The schematic is the big prize here.

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, if you then speak to Seagrave's his speech makes it obvious that he has a crush on Vera.

Medical Information
Seagrave's medical information may be accessed from Doctor Preston's terminal in the Rivet City clinic.

Appearances
 only appears in Fallout 3.