Mannequin (skin tone)

A mannequin is a hidden skin in The Sims 2. Mannequins are only used by Body Shop, and were not intended for normal gameplay.

Technically, mannequins are merely Sims with pale gray skin. The mannequin skin tone is hidden in Create a Sim, and can only be unlocked by using the testingcheatsenabled cheat and enabling the CAS debug mode.

Mannequins can have a custom eye color (a pale brownish gray color) which can only be accessed in Create a Sim debugging mode by selecting the Alien skin tone, selecting the black alien eye color and then selecting the mannequin skin tone.

Mannequin babies
The game technically doesn't have mannequin babies. When female mannequins are pregnant, the game will crash when they go into labor. There's a mod to prevent the crash and enables Sims to safely give birth to a mannequin baby.

Like aliens, mannequin skin tone is always dominant. So if a normal Sim has a baby with a mannequin, they're much more likely to inherit the mannequin skin tone. If a mannequin has a baby with an alien, there is a 50% chance that they will have pale gray mannequin skin.