Beware the Nice Ones: Before his change into Neo Nazism and after his change from it, he's shown to be a Nice Guy. However don't mistake his change as weakness, as he personally kicks the shit out of Cameron for threatening to make Danny a Dark Messiah like him.
Death Glare : When he's arrested, the grin on Derek's face will haunt your dreams.
Freudian Excuse: The death of his father at the hands of afroamerican gangbangers
Heel-Face Turn : It's arguable when exactly this happens. Possibly when he's raped by the other White Supremacist inmates; when he gets a visit from Sweeney who asks him the Armor-Piercing Question; or when he makes friends with a black inmate, who possibly saves him from further violence.
Jerkass Woobie / Jerk with a Heart of Gold: Almost every flashback scene she snarks at everything Derek says, but it's hard not to feel bad for her since she worries about him and Danny. It's toned down when Derek is out of prison and she's one of the few genuinely happy about his change.
Played By: Ethan Suplee
Big Eater : Several of the scenes involve Seth either eating (jellybeans, burgers) or whining about being hungry.
Informed Judaism : Gould (the actor) is Jewish, and the character is stated to be Jewish, but there's no real indication that he practices Judaism.
Reasonable Authority Figure : Sees Derek's violence toward his family and tries to call him on it, and rather than suspend or fail Danny over the Hitler paper, sends him to talk to Sweeney.
Took a Level in Jerkass: Although genuinely concerned about Danny he's one of the few good guys that refuses to believe Derek has changed. When he laments to Sweeney that Danny is becoming like his brother, Sweeney calls him out on it since he witnessed the change firsthand.
Played By: Stacy Keach
Big Bad: The closest one the film has. By the time Derek is out of prison he's organizing several white supremacist gangs throughout the west coast
Magical Negro: Unlike Sweeney, Lamont is more of a plot point to make Derek question his own racist, conservative views. He does, however, have some unstated hold over the other inmates who end up NOT kicking Derek's ass.