Lock is six years old and supposedly the leader of Oogie's Boys, but does not think thoroughly and actually appears to be the least intelligent of the three. Lock wears a devil costume; his barbed tail moves as though alive, his teeth are pointed sharply, his face is narrow and long-jawed, and his hair is waxed into two horns making him, literally, a handsome devil. He loves being large and in charge, and gets upset when others insult him or take the lead. However, he goes along with others' ideas if he cannot come up with anything himself. Without his mask he might not have horns but his handle bar style hair makes it look really close.