I was looking for the informations about hidden traits in sims 3. And I found it in THE SIMS WIKI. So I copied it to have it in one place where ever I will need it :) I didn't know there are so many of them :D
The Sims 3: Hidden Traits
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.
Children of high-ranking military officials know enough about the military's rules and regulations to snap off a smart salute when they want.
Immune to Fire (Ambitions)
The Immune to Fire hidden trait can be found in children of NPC Firefighters or Sims in the Firefighter career
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 (Ambitions)
The Pyromaniac hidden trait can be found in children of NPC Firefighters or Sims in the Firefighter career
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 shortly set things on fire without destroying anything.
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.
- Sims with this trait occasionally play air guitar. [confirmation needed]
PrivateEye (Ambtions)
The PrivateEye trait is a hidden trait added with Ambitions.
- What it does or how to get it is unknown, however, it is guessed that it is gotten by reaching a certain level in the Investigator profession or maybe it is given to the child of someone in the Investigator profession.
- It has no icon.
Asian Culture (World Adventures)
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 (World Adventures)
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 (World Adventures)
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 (World Adventures)
The Mummy hidden trait can be found in Sims who are mummies.
- Makes Sim behave like a Mummy
SimBot (Ambitions)
The SimBot hidden trait can be found in Sims who are SimBots.
- Makes Sim behave like a SimBot.
- Cannot enter water
- Able to destroy household objects, like fridges
- Eat scrap instead of food
- Don't have a hygiene or bladder needs
- Able to get jobs, and have romantic relationships
Vampire (Late Night)
The Vampire hidden trait can be found in Sims who are Vampires.
- Makes Sim behave like a Vampire.
- Runs faster
- More interactions with Sims
- Secret trait is passed on to their children
- Brighter eyes
- Sharper teeth
- Gives normal Sims who don't know them a negative moodlet
- Night gives them a major energy boost
- When sleeping, V's will replace the snoring Z's
- Sleeps on an altar
