Only Sane Man: You'd think Samson would have learned; Avatara are not the most mentally-stable of people.
Pay Evil unto Evil: Samson's solution to the Babylon problem - specifically Stangler escaping Carny Justice and no one being held accountable for Dora Mae's death? Shoot Stangler between the eyes anyway.
Heroic BSOD: Multiple times, although to be fair, it really does suck to find out that your mother tried to kill you because you were the product of a rape, the daughter of the Antichrist, and very probably heir to some serious demonic powers.
Lipstick Lesbian: Or, Lipstick Bisexual. She makes out with Libby, but nothing is ever really made of it.
Pet the Dog: Almost Hypocritical Heartwarming, but when Dora Mae is killed, Libby turns up missing as well. Cue Rita Sue frantically searching for her daughter. Libby shows up later, smoking and backtalking Rita Sue - who slaps her, then hugs her tightly.
Stage Mom: Teaches her daughters all her stripping and prostitution tricks, and when they don't listen, proves that she's still got it.
Jerk with a Heart of Gold: All his dubiously-legal hijinks - pimping his wife and daughters, blatantly cheating the public, shilling fake healers, gambling - are so obviously due to his devotion toward his family.
Well, except for the gambling, since he's generally terrible at it, which leads them into trouble. Still, with everything else that's the part of his character most depicted as a failing.
Pervert Dad: Yeaaaah, with the pimping and the exploitation...
The Dragon: To Justin, at least until Stroud comes along.
Heel-Face Revolving Door: Much debate centers around Iris's true nature after the events of Season Two. Is she still loyal to Justin? Was her alliance with Norman just for appearances? Why did she let Ben go? Is she truly sorry for setting the Ministry fire? And just whose side is she on, anyway?
Parental Substitute: For Justin and Iris, which makes Justin's sadistic treatment and killing of him very Oedipal in nature.
Sacrificial Lion: One of the great shockers of the finale is Justin killing him.
Tommy Dolan (Robert Knepper)
Deal with the Devil: Ironically referred to exactly as such by Brother Justin. Since Tommy still thinks Justin is a simple man of god, he jokes "Oh come on, I'm not that bad." Justin replies "No, you're not."