Hidden trait

Hidden traits are traits in The Sims 3 that cannot be seen in-game except when a Sim performs a related action autonomously or an unlocked interaction is available.

Hidden traits become available to Sims in specific careers, life states, or to babies with an NPC for a parent. The child might then get the appropriate hidden trait.

Burglar

The Burglar hidden trait can be found in children of Sims in the Criminal career.

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.

• Can "Sneak" instead of walking or running.

Can Apprehend Burglar

The Can Apprehend Burglar hidden trait can be found in children of NPC Police Officers and Sims in the Law Enforcement career.

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.

• Can fight NPC burglars on home lot.

Can Salute

The Can Salute hidden trait can be found in children of Sims in the Military career. Also sims who attended Fort Starch Military School receive this ability.

Children of high-ranking military officials know enough about the military's rules and regulations to snap off a smart salute when they want.

• Can "Salute" other Sims. Also Sims who get sent to Fort Starch Military School can also "Salute" other Sims.

Immune to Fire

The Immune to Fire hidden trait can be found in children of NPC Firefighters, Sims in the Firefighter profession, and Genies.

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.

• Can not be killed by fire

Makes No Messes

The Makes No Messes hidden trait can be found in children of NPC Maids.

The descendants of maids have cleanliness imprinted on their genetic code so they never leave anything dirty.

• Never leaves messes, similar to an attribute of the Neat trait.

Pizza Appreciator

The Pizza Appreciator hidden trait can be found in children of NPC pizza deliverers.

Pizza delivery folks develop a love of pizza that's deeper than the thickest crust. Their children share a similar fanaticism for pizza, which makes every bite of hot pizza amazing.

• Eating pizza grants them the Amazing Meal moodlet.

Pyromaniac

The Pyromaniac hidden trait can be found in children of NPC Firefighters.

You can only get this trait in a Sim who is the offspring of a firefighter Sim. The trait allows them to set fire to objects of their choice, and they get positive moodlets for doing so!

• Can transmogrify any fruit and turn it into a flame fruit.
• Can set things on fire for a short time without destroying anything.
• Instead of 1 hour, a Sim with the Pyromaniac trait will need 3 hours to die by fire, thus their moodlet will be positive.
• If a Sim in the house has already bought the Fireproof Homestead Lifetime reward, The Pyromaniac Sim will never be able to set things on fire in that house again.
• Despite the fact that the fire does not harm anything, it will still trigger the fire alarms if there are any nearby, summoning the fireman/woman and leading to a fine.
• It is good to have Pyromanaic put together with Immune To Fire so that the pyromaniacs don't accidentally set themselves on fire and die.
• if Showtime is installed (this rarely happens) sometimes Genie's children have this trait.

Rocker

The Rocker hidden trait can be found in children of Sims in the music career.

Sims with this trait will get a natural feeling of rock stardom.

PrivateEye

The PrivateEye trait is a hidden trait added with Ambitions.

• Ability to Sneak
• It is gained by reaching level 7 in the Investigator profession.
• Sim can bribe or beat up to convince another sim while completing an opportunity, even if they don't work in the Investigator profession anymore.
• This hidden trait is passed on to their children.
• It has no icon.

Asian Culture

The Asian Culture hidden trait can be found in children of Sims from Shang Simla

The three "culture" hidden traits from The Sims 3: World Adventures have no in-game icons or descriptions.

• Chinese-themed idle animations.
• Uses chopsticks when eating.
• Sings Chinese songs autonomously.

Egyptian Culture

The Egyptian Culture hidden trait can be found in children of Sims from Al Simhara

The three "culture" hidden traits from The Sims 3: World Adventures have no in-game icons or descriptions.

• Sings Middle Eastern songs autonomously.
• Egyptian-themed idle animations.

French Culture

The French Culture hidden trait can be found in children of Sims from Champs Les Sims

The three "culture" hidden traits from The Sims 3: World Adventures have no in-game icons or descriptions.

• Greets other Sims with a dual-cheek kiss (known in real-life France as La bise.)
• Sings French songs autonomously.
• Gets a discount when visiting France.

Mummy

The Mummy hidden trait can be found in Sims who are mummies.

• Makes Sim behave like a Mummy.
• Makes a sim unable to friend other sims.
• Cannot go on vacations.

SimBot

The SimBot hidden trait can be found in Sims who are SimBots.

• Makes Sim behave like a SimBot.
• Short Out upon entering water
• Able to destroy various household objects
• Eat scrap instead of food
• Don't have a hygiene need
• Able to get jobs, and have romantic relationships
• SimBots snore binary code (0s and 1s) instead of Zs
• Occasionally, when an electrical object breaks down, SimBots will approach it and mourn

Vampire

The vampire hidden trait can be found in Sims who are vampires.

• Makes Sim behave like a Vampire.
• Runs faster than normal Sims.
• They can read another normal Sim mind at night, hunt and drink plasma from sim.
• Secret trait is passed on to their children.
• Vampire Sim will have Brighter eyes and Sharper teeth.
• Gives normal Sims who don't know them a negative hunted moodlet.
• Night gives them a major energy boost.
• When sleeping, V's will replace the snoring Z's.
• Can sleep on altar.
• Thirst replaces hunger by drinking other human sims, plasma fruit can be grown and bought as a blood replacement, and a new quick meal of plasma juice replacing plasma fruit or actual blood.
• Vampires learn skills at an alarming rate of mastering a skill in the duration of 2 sim days in Late Night.
• Young adult vampires can live for 100 days.

Imaginary Friend

The Imaginary Friend hidden trait can be found in Imaginary Friends or in any Sim who was once an Imaginary Friend.

• An Imaginary Friend can switch from "doll mode" to "Sim mode" and vice versa if they have already drunk the Imaginary Friend Metamorphium potion.
• An Imaginary Friend that has not drunk the Imaginary Friend Metamorphium potion can only be seen by the owner of the doll.
• This hidden trait is passed on to their children.
• Has no game icon.

Lazy

The Lazy hidden trait from The Sims 3: Generations has no in-game icons.

• Has no game icon
• This hidden trait is removed from the game if The Sims 3: Pets is installed.

Unicorn

The Unicorn hidden trait can be found in Unicorns.

• Has no game icon.
• Gives unicorn special abilities.
• Makes horses behave like unicorns.
• Runs faster than normal horses.
• This trait may be passed on to a horse's foal.

Genie

The Genie hidden trait can be found in Sims who are Genies.

• Has no game icon.
• Gives genie special abilities.
• When running, a Genie will be floating.
• This hidden trait is passed on to their children.

World Peace

The World Peace hidden trait can be found in Sims who have wished for World peace from a Genie.

• Has no game icon.
• This hidden trait is passed on to their children.
• Sim can talk about "World Peace" with another sim.

World Misery

The World Misery hidden trait can be found in Sims who have the Evil trait and wished for World Misery from a Genie.

• Has no game icon.
• This hidden trait is passed on to their children.
• Sim can talk about "World Misery" with another Sim.

Trivia

• 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 from 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 in World Adventures. They will get the Singed moodlet, but they won’t die if they catch on fire again.
• Sims can't get the Lazy trait except by using a third party mod, and this trait has no effect on sim. When the code for this trait is opened, this trait have Code Version EP5 and Age Species Visible Dogs, Cats, Horses.
• Sims can get the Unicorn trait by using a 3rd party mod.
• There are 4 more hidden traits Labeled "DNT" that come with The Sims 3: Showtime. Sim can't get those traits except by using 3rd party mod. They currently have no effect on Sims.