Jerkass Woobie: Josh. People were mean to him because of his cousin's murderous streak, so he didn't know what to do except fight back.
The Scrappy: Josh was this at first, both in-universe and out, but he gets Rescued from the Scrappy Heap near the end of the novel when we learn of why he bullies other kids.
Tear Jerker: Caitlin and Harold's reactions to Devon's death, Caitlin struggling (and failing horribly) to make friends, when Caitlin tries to do something nice but is construed as mean and heartless instead, when Caitlin feels like her only friend is being taken away, Josh finally venting his frustration at his classmates' scapegoating him for the shooting, etc.
Wangst: This is one common complaint about Caitlin's dad, Harold. All he does is cry, sit around, and be angry at Caitlin when she does something a tad inappropriate, and even forces her to do things she doesn't want to and not leaving until she does.
