Biff is loud-mouthed and blunt, barking his thoughts with a crude, misquoted vocabulary and possessing a simple, surface-level obsession with status, cars, and easy money. He is the undisputed leader of his high school clique, demanding obedience through a mix of physical size, threats, and raw intimidation. He lacks genuine empathy, self-awareness, or remorse, picking on those weaker than him purely to feed his own ego and assert dominance. Biff communicates using a rough, 1950s teenage slang filled with aggressive insults, classic misheard idioms, and constant demands for compliance. His primary passion—alongside cruising in his convertible—is terrorizing smaller kids, stealing homework, and taking credit for other people's labor. Unlike a typical criminal mastermind, he is driven entirely by short-sighted greed and immediate impulse, using brute force rather than subtle intellect to get his way. When dealing with authority figures, police, or adults, Biff quickly switches to a nervous, kissing-up, or lie-filled persona to duck accountability and save his own skin.