Miles Gloriosus: He puts out an image of toughness but Andy is able to take him down with ease. Even when Bender pulls a knife and casually talks about killing Andy, he's slowly backing away from the fight.
Mouthy Kid: When Vernon attempts to find a solution to keep the door open. Bender's comments are both hilarious and true.
Smarter Than You Look / Jerk Ass Has A Point: While he isn't book smart, he is able to cleverly deduce things about the others. He was the first to tell that Claire is a virgin before Allison made her admit it and was the first to notice that Andrew didn't like his parents before Andrew tearfully admitted it in the end.
Bender: You're an idiot anyway, but if you said you liked your parents then you're a liar too.
Sociopathic Hero: At first, then he warms up to the four others he's spending detention with.
Crazy Consumption: Allison lets her soda spill out, and licks it off the table. Then she throws away the baloney from her sandwich, and replaces it with Pixy Stix (powdered candy) and Cap'n Crunch cereal.
Handy Feet: She claims she has them. In the uncut version of the movie, the only copy of which was on a VHS tape lost after John Hughes' death, this claim was followed with her actually writing with her toes, completely filmed.
Loners Are Freaks: She's often ignored by everyone, including her own parents causing her to do bizarre things.
Parental Neglect: The only information she ever volunteers about her parents is when Andy asks her what her parents did to her. She replies with a simple but pained "they ignore me".
Dean Bitterman: although it's deconstructed somewhat in his conversation with Carl.
Vernon: Carl, I've been teaching for twenty-two years. And, each year, these kids get more and more arrogant.
Carl: Aw, bullshit, man. Come on, Vern, the kids haven't changed; you have. You took a teaching position because you thought it'd be fun, right? Thought you'd have summer vacations off. And then you found out it was actually work, and that really bummed you out.
Vernon: These kids turned on me. They think I'm a big fucking joke.
Carl: C'mon…listen, Vern, if you were sixteen, what would you think of you, huh?
Vernon: Hey, Carl. You think I give one rat's ass what these kids think of me?