Death Thirteen

Death Thirteen is the stand of Mannish Boy, an antagonist featured in Part III: Stardust Crusaders.

Appearance/Personality
Death Thirteen appears as the Grim Reaper holding a scythe. However, in place of a skull, it has a clown face with downwards curved eyes and an eerie smile. Its mouth never moves as it talks, though it can move its mouth and face independently. Outside of its head and arms, Death Thirteen has no physical body, meaning any attacks aimed at its clothing simply passes through it. Death Thirteen is also an extremely unique stand, because it is controlled by an 11 month-old user. Its relationship with its user appears almost backwards, with Death Thirteen acting more like the user and the Mannish Boy as the Stand. It represents the Tarot Card Death. Its personality is very fitting for a mix between a clown and the Grim Reaper: it speaks easily, swearing and mocking, while still acting childish, though disturbing, such as it filling Noriaki Kakyoin's mouth with eyeballs. It is also rather sadistic in killing its targets, placing its scythe in Jean Pierre Polnareff's mouth to kill him instead of simply slicing him in half, and being prone to fits of maniacal laughter, written as a childish "Hehehe", and boasting, though its over-confidence makes it extremely foolish, not realizing Kakyoin's plan until after it had been completed. Death Thirteen is possibly one of the most sadistic and disturbing creatures in the entire series, showing no remorse for human life despite its sentience, and enjoying torturing its victims instead of killing them outright, despite being only a stand.

Ability
Master of Dreams: This ability actually comes in two parts. The first is when anything alive (human or otherwise) falls asleep near Mannish Boy, Death Thirteen's User. They are then drawn into Death Thirteen's dream world, which appears as a massive carnival, complete with Ferris wheels and roller coasters. Death Thirteen has full control in his dream world, sans the people who dream themselves into it. He is able to make death machines out of mechanical items, make objects out of nothing, or even trick a person into thinking they have summoned their stand, though this is actually Death Thirteen, as nothing besides those who are asleep can enter Death Thirteen's world.

If the victim dies in the dream world, he stays dead even in the real world, and any injuries the person receives are transferred to the real world as well. The corpse of anyone he kills stays where it was killed in the dream, becoming a part of it, and thus under Death Thirteen's control. If, by some miracle, the person manages to survive Death Thirteen's assault, they forget what happened when they wake up, and only remember once they return to Death Thirteen's world, making attacking his relatively weak user very hard to do. The only way someone may  remember what happened in the dream world is if he sleeps with his stand active beforehand. Doing this the person is also able to summon the stand inside the dream, otherwise he is unable to do so.

Trivia

 * Death Thirteen's powers are similar to those of horror icon Freddy Krueger.