Although he is a homicidal maniac, Vyvyan can be friendly and creative; in one episode ("Flood"), he made his own potion to change a person into an axe-wielding homicidal maniac. He has more friends than the others but "he doesn't like any of them." He often causes damage such as wiring the doorbell to a bomb, and adding a 289 CID Ford V-8 engine to the vacuum cleaner, which proceeds to suck up the carpet, the floorboards and a friend of Neil's. Vyvyan also seems to be the only member of the group with a driving licence.