Covered with Scars: According to one character you look like you "Lit your face on fire and tried to put it out with an ice pick." He then says he read that in a joke book, but considering how often you get shot at...
Worthy Opponent: By the end even the Calculator has come to admire your tenacity.
Utopia Justifies the Means: If the Warrior merges with the Calculator with bad karma, then s/he murders the Brotherhood Elders, dissidents, and prepares for a potential war with the rest of the Brotherhood back west all in the name of creating a safe wasteland.
The Warrior's initial commanding officer, General Barnaky gives the player his missions and objectives. He's a gruff Drill Sergeant Nasty and will be quite harsh on the Warrior until they earn his respect with several successful mission completions.
Brainwashed and Crazy/Face-Heel Turn: After being defeated by the Calculator's robots, his brain is extracted from his body and placed in a unique humanoid brain-bot to serve as the Calculator's The Dragon. He retains his original personality and memories, but has been indoctrinated into believing in the Calculator's goals.
Brain in a Jar: What the Calculator does to him. You can potentially do it to him again, uploading his brain into the Calculator itself.
Cyborg: His fate at the hands of the Calculator.
The Dragon: The Calculator turns him into its Cyborg General, due to his extensive knowledge of the B.O.S.'s capabilities and tactics.
Drill Sergeant Nasty: He's full of this in the earlier missions, although he does drop it quite a bit once you earn his respect by completing several missions successfully. Helps that he's voiced by the Patron Saint of this Trope.
Fantastic Racism: He's shown to have a very strong disdain for Super Mutants and Ghouls, and if he's allowed to merge with the Calculator he ends up enslaving those populations to serve humanity. He's not a huge fan of Tribals, either, as he makes perfectly clear to you (a Tribal) in the first few missions.
Morality Pet: His wife, Maria, is this to him. To the point that even when robotized and working for the Calculator if he detects his locket or letter to his wife on you when you fight him, he realizes what he's doing is wrong and gives up.
Not Quite The Right Thing: Allowing Barnacky to merge with the Calculator, instead of doing the Heroic Sacrifice yourself or simply destroying it and letting its technology and power go to waste, seems like a very clever way to Take a Third Option. This quickly turns out to not be the case, as the racist Barnacky ends up enslaving the native population of the Wasteland, as well as the Super Mutants and Ghouls, to serve the Brotherhood.
The leader of the Super Mutant army and the initial major foe the Brotherhood of Steel faces.
Authority Equals Asskicking/Anticlimax Boss: On the one hand, Gammorin has fairly high stats and is a pretty good fighter. On the other hand, he's fought almost alone with only a couple Super Mutants helping him, while you have your entire 6 person squad.
Disc One Final Boss: Defeating him is the main objective of the first 1/3rd of the game, before the Calculator's forces reveal themselves.
Well-Intentioned Extremist: His main goal is to strengthen the Super Mutant army in order for them to fight the Calculator's forces and stop it from exterminating all organic life in the Wasteland. Unfortunately, the way he goes about doing this is fairly destructive for the surrounding population, which is not helped by the fact he's at least partially insane.
You Kill It, You Bought It: Gammorin turns out to be Paladin Latham, a high-ranking Brotherhood of Steel commander, who was lost during the original crash of the expedition's ships, and ended up being captured by the Super Mutant army. He killed the real General Gammorin in combat, an act which earned him the Super Mutants' respect and caused him to end up becoming their leader, taking Gammorin's name in the process. Due to a head injury he sustained during the fight, though, he's slowly going insane and now partially believes himself to be the original Gammorin.
A computer overseer of Vault 0 and the leader of the robot army.
Blue and Orange Morality: It's actually doing what it was programmed to do. Problem is a few cut corners in safety protocol, a century without maintenance, and being plugged into a bunch of brains of questionable quality has corrupted its programming.