Mannish Boy

Mannish Boy is a dark-skinned infant marked by oversized ears and unexpectedly sharp canine teeth. He keeps a headscarf wrapped over his head.

Beneath the helpless exterior sits a mind that reasons like a grown man's. In public he mimics an ordinary baby to escape suspicion, even fending off a scorpion and puffing on cigarettes when it suits him. His real self only emerges once his targets doze off within reach of Death Thirteen, at which point he speaks freely, cursing and jeering in a mockingly childish register. Gleefully cruel, he prefers tormenting his victims to finishing them quickly, ranks among the series' most disturbing figures, and lets his own boastful overconfidence trip him up.

His Stand, Death Thirteen, is a clownish figure that hauls sleeping people into a dream realm it rules completely, a place where victims cannot call on their own Stands and can be slain freely. Tied to the Death tarot card, it turns anyone who sleeps near the baby into prey. A woman fearful of the child hands him to the Joestar Group under the pretext of finding his parents, and they take him in unaware of the danger.

Aboard an airplane he torments Noriaki Kakyoin in his sleep, striking the others as they too drift off, and Kakyoin's thrashing brings the plane down. Because no one recalls the dreams, the group writes Kakyoin off as unhinged until he carves a warning into his own arm mid-dream. When Polnareff knocks Kakyoin out while Hierophant Green happens to be manifested, that Stand slips into the dream and defeats Death Thirteen. Subdued at last, Mannish Boy is told he will be left in a nearby city near his mother, and Kakyoin quietly repays him by lacing his baby food with his own excrement, which an oblivious Joseph and Polnareff feed to him.