Possessed Sims can spawn naturally wandering around public lots of StrangerVille at night, or anytime after opening the first door in the secret laboratory. A possessed Sim's motives are always locked at full. When sitting, the Sim will still exhibit the strange neck posture and facial expressions. While walking, possessed Sims will crane their neck at a 90 degree angle, have their now-disjointed and doll-like limbs stretched out in unnatural directions, and will continuously wear a wide smile with widely opened (and sometimes winking) eyes. If conversation is initiated by the possessed sim, the interaction bar that is normally found on the top center of the screen will not appear.

The player can make the possessed Sim talk with other Sims about a 'Normal Sim's problems', about flowers or about the ' Mother'. While possessed, the player has limited ability to control the Sim, and it will constantly override interactions with strange and dysfunctional interactions, such as wandering around or staring at objects. The Sim will then twist and contort a couple of times, creepy music will play, and their emotion will change into possessed. Upon creating a batch of bizarre fruit juice, it will have a default description that says 'this fizz feels strange'. Drinking a bizarre fruit juice will also result in a sim becoming possessed.

Vampires can also become possessed if they drink plasma from a Sim who has the infected trait. This special emotion can be achieved by collecting the bizarre fruit in StrangerVille and eating it, or by entering into a toxic cloud in the second level of the secret laboratory. Sims will always feel this emotion upon getting the 'Possessed' moodlet, which shows 7,548,431+ points towards the possessed emotion, overriding any other emotions. Possessed (stylized in-game as PØŞŞ€ŞŞ€Đ) is an emotion introduced in The Sims 4: StrangerVille.

Sims 4 body swap mod