Biff Wilcox

is Rusty-James' rival, introduced early in the book when Rusty is told that Biff wants to kill him. They have a knife-fight where Rusty almost wins but is distracted by the arrival of The Motorcycle Boy; when Rusty-James looks at The Motorcycle Boy, Biff grabs the knife and slashes it across Rusty-James' side, leaving a long gash. Rusty-James is later expelled from school and placed in Biff's school.

Biff is a member of another group, formerly allies of Rusty James's group, now enemies. Rusty James notes that if the old gang wars were still going on, Biff would be leader of his gang, the Dev-ilhawks. He is tougher and more dangerous.