Sperg is the local bully at Billy's school. He is often seen tormenting Billy, Irwin, Pud'n (or all three), or other kids to no end. Sperg is a husky 11-year-old boy whose preferred method of terrorizing nerds is by administering his "lethal" wedgies. He has a heart-shaped tattoo that reads: "MOM" on his arm, and he's usually seen wearing a red beanie with a red puffball on top. Sperg is extremely defensive of his mother, who (surprisingly) is very beautiful, despite her son. Even though he has brutal strength, Sperg is scared of Mandy because she's stronger than him. Sperg's life-long dream when he gets older is to become a dancer and singer on Broadway. Sperg is a bully and terrorizes kids but despite his physical strength, he is frightened of Mandy because of her toughness and cynical attitude. Sperg tends to be very emotionally sensitive, though he tends to keep this side of him under wraps. He is the lead Guitarist in his band Purple Filth.