Two alternate life states exist in The Sims and its expansions, though they are not well-defined and do not grant any changes in a Sim's behavior.
When Sims die, they become ghosts. In Livin' Large, pleading with the Grim Reaper may result in him bringing a recently deceased Sim back as a zombie. If Unleashed is also installed, these zombies can be restored by Miss Lucille, who can be found on community lots in Old Town, though she cannot restore their personalities. Also in Livin' Large, Sims using the chemistry set might make a purple potion that can temporarily turn a Sim into a monster.
It could be said that witches and warlocks come with Makin' Magic, but being magical is not treated as a life state in that expansion. Sims who take up magic still look and act the same, and the terms "witch" and "warlock" are not used.
In Makin' Magic, one of the charms that can be made is Beauty or Beast. This charm allows a Sim to temporarily change his or her appearance, and some of the available choices resemble life states from later games, such as werewolves and vampires. While players may choose to treat this as a temporary transformation or an illusion, the in-game effects are the same either way. The Sim who has been "charmed" is still a normal Sim; the charm only affects the Sim's appearance and does not affect the way the Sim behaves or the way other Sims react to him/her, and the Sim gains no extra abilities or interactions.
The Sims 2
Most expansion packs for The Sims 2 added an alternate state in which Sims can exist. Some added sentient creatures which Sims cannot become, but which can be playable Sims. These states have unique triggering techniques, advantages and disadvantages. These states are:
- Normal Sim
- Ghost (Not playable)
- Mannequin (hidden)
- Zombie [TS2:U] [TS2:FT] [TS2:AL]
- Vampire [TS2:NL]
- Werewolf [TS2:P]
- Servo [TS2:OFB] 
- PlantSim [TS2:S]
- Bigfoot [TS2:BV] 
- Genie [TS2:FT] (Not playable) 
- Witch [TS2:AL]
- Spectral cat [TS2:AL]
Each life state offers new opportunities for the Sim, making certain aspects of play easier to handle and others harder.
The Sims 3
The Sims 3 and its expansion packs, as of 22 October 2013[update], feature 15 life states. Official game text recognizes certain kinds of life state as "occult", and occult Sims cannot be given makeovers by stylists. Prior to The Sims 3: Supernatural, Ghost was not considered an occult status according to the game files. With Supernatural, players are able to create some occults with a Supernatural Type selector in Create a Sim. These life states include normal Sims, ghosts, vampires, genies, werewolves, witches, and fairies.
Several states in Supernatural (i.e. Toad Sims, Tragic Clowns, and Zombies) are not considered to be occult. They are merely temporary states and can only affect normal Sims. The state can be cured by removing the moodlet with the Moodlet Manager or drinking the Cure Elixir.
- Imaginary Friend[TS3:G]
- Time Traveler[TS3:ITF](hidden)
- Temporary state
The Sims 4
Only the Normal Sim life state was initially included in The Sims 4, but a patch reintroduced the ghost life state. With Get to Work, aliens were made available in Create a Sim for the first time in the series. In Cool Kitchen Stuff, Sims can obtain the appearance of a PlantSim by eating Plant Matter ice cream; however, the effects are only temporary. With Patch 49, PlantSims were properly added in with improvements, albeit still being a temporary state. With The Sims 4: Vampires, vampires were made available in Create a Sim along with customizable vampire features and new powers.
- Normal Sim
- FakeAlien (Obtainable by drinking Alien Aura serum [TS4:GTW])
- PlantSim (Obtainable through the ice cream maker or through eating the forbidden fruit; the duration of the effect will differ, the former being much shorter)
- Skeleton (Obtainable through a cursed relic)[TS4:JA]
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