Mannish Boy

The otherwise unnamed Mannish Boy is a minor antagonist featured in Part III: Stardust Crusaders.

Personality
Mannish Boy seems to be quite intelligent, being able to think like an adult. How he came to discover his stand and if his stands has a mind of its own its unknown, but he seems to enjoy torturing others.

Synopsis
After his stand is defeated and taken control of by Kakyoin, Mannish Boy is told to return to his parents and to stop mocking adults. Kakyoin teaches him that lesson forcefully by mixing some of his poop into his baby food. Naturally, Joseph and Polnareff, who are clueless about this, decide to feed him the contaminated food, forcing Mannish Boy to learn his lesson.

Trivia

 * Mannish Boy's catchphrase appears to be him giggling, "hee hee".
 * For some reason, he possesses fangs similar to those of a vampire.
 * Mannish boy is one of only three infant stand users in the series, joined by The Green Baby and Shizuka Joestar.
 * Although Mannish Boy only appears in the PS1 version of JoJo's Bizarre Adventure: Heritage for the Future, his stand Death 13 appears in all versions as an NPC that can only be fought by the protagonists when conditions are met.