Achtung Baby

Achtung Baby (アクトン・ベイビー) is the Stand of Shizuka Joestar featured in Part IV: Diamond is Unbreakable.

Appearance/Personality
Achtung Baby is bound to its user's own body, granting her the ability to turn invisible. Because of that, its physical manifestation is never shown, nor is there any trace of personality.

Abilities
Invisibility: It has the power to render its user invisible as a protective measure. Depending on stressful situations for Shizuka, the active strength of the stand can increase making the immediate surroundings of the child invisible as well, be it a person's fingers, her baby carriage or even the ground. At its full power, it makes everything in a several foot-radius invisible.

The shape of her invisibility can change as well, as shown when she was dropped into a pool and Joseph slit his wrist to use his blood to locate her, the shape was that of a sphere.

Trivia

 * The artbook JOJO A-GO!GO! incorrectly lists its name as Achtug Baby.
 * The term "Achtung" is German and translates "Attention/Caution".