Ambiguously Evil: The show questions whether or not Danny is a sociopath. Not only do we not know if he killed Regina, we don't even know why he killed his aunt. And then there's that whole thing with him having the victim's necklace.
The Atoner: He regrets messing up Lacey and Jo's lives and he wants to make things right with them.
Jock Dad, Nerd Son: Inverted with Vikram and Danny. They apparently got on like a house on fire when it came to toy rockets and sports. Played straight with his mother, who in a moment of carelessness, accidentally reveals a lot more than she intended in front of Tess and Danny when he was younger.
Manipulative Bastard: It's very subtle, but he does charm and manipulate people to get them to do things they don't normally do. He also has a tendency to evade questions and not quite answer them directly. Jo, by the end of the first mid-season finale, has tired of this.
Mysterious Past: We don't know anything about his life in the past five years. Lampshaded by Chief Masterson.
Masterson: You don't know a boy who murdered his own aunt. You don't know a boy who spent the last five years in prison. You don't know what he went through.
The Quiet One: He's rather mild mannered and soft spoken and while he's sarcastic, he's not bitingly so.
The Sociopath: People think Danny fits this trope, but it remains to be seen whether or not he actually does.
Danny is proving to be too adept at deflecting and lobbing his own curve balls when he gets uncomfortable questions. Sociopaths are known to show a glib facility for keeping other people off-balance when it suits them.
All Girls Want Bad Boys: Subverted with Lacey. Despite two Almost Kisses followed by a real kiss in "Fest and the Furious" she still resolves to keep her distance from Danny. And then she has sex with him and is his girlfriend for several episodes.
I Did What I Had to Do: Said word for word in the pilot. She broke away from anything that reminded her of her childhood in order to survive the bullying she went through.
Jerkass Fašade: Her persona as the tough popular bitch is a defense against the harassment and bullying she went through after Danny went to prison. Despite no longer being friends, she still cares for Jo and can't help but still care about Danny.
The Alcoholic: Hinted at when Danny finds her drinking late at night, even though Karen just says that it's her second glass.
Fallen Princess: She used to rule the town's social scene, but all that changed after Danny went to juvie. The pilot also reveals that her late husband made a series of bad investments so now all their family's money is tied up in the house.
Mama Bear/Knight Templar Parent: She's willing to do whatever it takes to protect Danny, though sometimes she employs occasionally suspicious methods. Throwing the mysterious necklace into the lake in the dark of night, for one.
The Dragon: Regina was apparently acting on orders from someone, when Lacey discovers an envelope of hush money and a letter from Regina saying she did as she was instructed.
Lovable Alpha Bitch: Played with. On the one hand, she was friendly enough to Jo despite the latter's low social status. On the other hand, the second episode reveals that even her own best friend thought very little of her, meaning she may not have been quite as lovable as she appeared.
She Knows Too Much: The police think that this is Danny's motive for murdering her: She claimed (probably falsely) to know the reason he killed his aunt when he was eleven. It turns out she also knew at least some things about Vikram's doings.