Mannequin (skin tone)

A mannequin is a hidden life state in The Sims 2. Mannequins are not part of the normal gameplay in the game.

In The Sims 2, unlike most other life states, they do not have any special abilities or properties, other than their appearance. 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 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 and they're in labor, the game will crash. There's a mod to prevent the crash and enables mannequins to safely give birth 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.