These traits are hidden but otherwise function similar to the standard traits. These hidden traits are often found in NPCs and Sims who reach certain career levels. Sims with these traits have a 50% chance to pass them onto their offspring.
Burglars must perfect their sneaking skills to properly liberate imprisoned items from the homes of neighbors. Burglars like to keep the skill in the family, so their children are able to sneak out like a pro at birth.
Found in burglar NPCs and Sims who reach level 7 of the criminal career in Thief branch. Sims with this trait can "Sneak" instead of walking or running.
Can Apprehend Burglar
Police officers spend years learning how to best the most clever burglars. Luckily for their children, genetics helps them stop burglars without years of tedious training.
Found in police officer NPCs and Sims who reach level 3 of the law enforcement career. Sims with this trait can fight any burglars on home lot. It also slightly increases the chance of a Sim winning a fight, but only if the Sim with this hidden trait initiated the "Fight!" interaction.
Children of high-ranking military officials know enough about the military's rules and regulations to snap off a smart salute when they want.
Found in Sims who reach level 4 of the military career. Sims who graduate from Fort Starch Military School also receive this trait. The salute learned from completing level 2 scouting can only be used in childhood and does not activate this trait.
Immune to Fire
Fire Fighters are able to survive countless fires; not least because of their natural immunity to fire. It's a trait that they pass on to their children.
You can only get this trait in a Sim who is the offspring of a firefighter, or genie Sim. The trait allows them to set fire to objects of their choice, and they get positive moodlets for doing so!
Found only in the children of a firefighter or genie. Pyromaniacs are able to transmogrify any fruit into flame fruit, start fires for a short time without destroying objects and can survive for up to three hours while on fire. When they are on fire their moodlet will be positive instead of negative. Eating flame fruit will recover some energy.
Sims with this trait will get a natural feeling of rock stardom.
Received by Sims who reach level 7 of music career in the rock branch. Sims with this hidden trait will occasionally perform some unique animations, especially when music is playing.
Found in Sims from Shang Simla. Sims with this trait will use chopsticks when eating, sing Chinese songs autonomously and bow when greeting other Sims. They will also use Chinese-themed idle animations. Sims without this trait will not do the idle animations, will only bow and eat with chopsticks when in China and will have to learn the Chinese songs manually.
Found in Sims from Al Simhara. Sims with this trait will sing Egyptian songs autonomously. They will also use Egyptian-themed idle animations. Sims without this trait will not do the idle animations and will have to learn the Egyptian songs manually.
Found in Sims from Champs Les Sims. Sims with this trait will sing French songs autonomously and greet other Sims with a dual-cheek kiss (known as la bise.). They will also use French-themed idle animations and receive discounts when visiting France. Sims without this trait will not do the idle animations, will only kiss when in France and will have to learn the French songs manually.
Found in Sims who have reached level 7 of the investigatorprofession. Sims with this trait are able to sneak instead of walk and can bribe or beat up other Sims to convince them during opportunities.
Become the Sim of the Future, today! Receive an upgraded phone and fit in better while in Oasis Landing.
Found in Sims who have wished for World Peace from a genie and allows them to talk about "World Peace" with other Sims. This trait is inheritable by the Sim's offspring.
Wished for World Misery
Found in Sims who have wished for World Misery from a genie and allows them to talk about "World Misery" with other Sims. This trait is inheritable by the Sim's offspring.
Wished for Long Life
Found in Sims who have wished for Long Life from a genie and will double the length of every life stage. This trait is inheritable by the Sim's offspring.
Wished for Beauty
Found in Sims who have wished for Beauty from a genie. This trait is inheritable by the Sim's offspring.
Wished for Large Family
Found in Sims who have wished for a Large Family from a genie. Sims with this trait will receive "Feeling Fertile" moodlet that results in the birth of triplets if the Sim tries for baby. This trait is temporary and is removed after the Sim tries for baby.
Wished for Happiness
Found in Sims who have wished for Happiness from a genie. Sims with this trait will get the "Eternal Joy" moodlet indefinitely. This trait is inheritable by the Sim's offspring.
Found in Sims who are witches. This trait will unlock the "Conjure Apple" or "Poisoned Apple" (if Sim is evil) interactions as well as allow them to discuss "Whiz on Magic", "Brag about Broom Riding" and "Enthuse about Magic" in conversation.
Found in Sims who are werewolves in human form. This trait will make the Sim behave as a werewolf and unlock the "Joke about Shedding" and "Show Off Teeth" interactions. This trait alone does not allow a Sim to transform into a werewolf.
Found in Sims who are junior mascots. Sims with this trait are about to change into the mascot costume and do mascot dances.
Received by Sims as they gain influence in nerd social group. Nerd interactions and activities are still limited to the influence level a Sim has, but having this trait will make Sims more likely to do nerd activities.
Received by Sims as they gain influence in rebel social group. Rebel interactions and activities are still limited to the influence level a Sim has, but having this trait will make Sims more likely to do rebel activities.
Received by Sims as they gain influence in jock social group. Jock interactions and activities are still limited to the influence level a Sim has, but having this trait will make Sims more likely to do jock activities.
There and Back Again
Temporarily assigned to Sims who "Rant about Death" using the megaphone. The trait grants the "There and Back Again" moodlet. If the Sim rants about death again while possessing this trait, they will die by ranting.
Advanced Art Training
Earned by Sims who complete the Skilled Painting opportunity acquired through working in the art appraiser career. Sims with this trait are able to paint paintings of any skill level (0 to 9), instead of paintings appropriate only to their painting skill level.
Advanced Art Training Brilliant
Earned by Sims who complete the Brilliance opportunity acquired through working in the art appraiser career. Sims with this trait are able to create brilliant quality paintings at will.
Advanced Art Training Masterpiece
Earned by Sims who complete the Masterpiece opportunity acquired through working in the art appraiser career. Sims with this trait are able to create masterpiece quality paintings at will.
Temporarily assigned to Sims after they successfully summon the kraken if they have Friend of the Kraken lifetime reward. The trait functions as a cooldown for the Sim to be able to summon the kraken again.
Found in Sims who are future descendants of the active household.
If a Sim in a house has already bought the Fireproof Homestead lifetime reward, a pyromaniac Sim will not be able to set a fire on that house.
Despite the fact that pyromaniac's fire does not harm anything, it will still trigger the fire alarms if there are any nearby, summoning the firefighter and leading to a fine.
If a Sim has the good trait and the secret private eye trait, the Sim won't have the option to beat up other Sims for information.
The ability to sneak with the secret private eye trait is only available for young adults and older.
With the secret can apprehend burglar trait, if the Sim has the coward or good trait, they are unwilling to fight burglars.
Even though a Sim has the immune to fire hidden trait, they can still be caught on fire from inventing, making metal sculpture, taking an experimental treatment from the Science career, or from a fire trap. They will get the "Singed" moodlet, but they won't die if they catch fire again.
Sims can get the unicorn trait by using a 3rd party mod.
Using 3rd party mods or cheats to simply add the hidden traits for various occults does not properly apply occult status and will cause problems, unless the trait is "PlantSim".
If using a mod and selecting the Rocker trait in Create A Sim, an animation will be played, unlike the other hidden traits. However, there is no description.
The Sims 4
The Sims 4 features some hidden traits that are never visible. Many of them are used only for technical purposes, such as marking visited secret lots, completed first time actions, or to provide functionality for NPCs. Hidden traits function similarly to regular traits, and typically only life state traits can be inherited.
Life state traits
Occult Sims will have these traits, though they can only be viewed when editing an occult in CAS and setting club membership requirements. However, PlantSims, Servos and skeletons cannot be chosen as club requirements, and they have no special icon in CAS. There are no in-game descriptions.
NPCs with completely unique traits, such as Bonehilda, are immortal and will not age or die. If they are somehow removed from the game using cheats or mods, an exact copy will be generated to take their place. Other NPCs will be replaced with new Sims if they give up their NPC role, which can be caused by moving them into a playable household, marrying them, or killing them.