The Sims 4
Traits are what give Sims their personalities. Every trait you give a Sim will add something to their personality. For example, giving a Sim the cheerful trait will make them happy more often. When you are first creating your Sim you can give them three traits, and when you choose their aspiration you get one more. After that you can give them more traits by completing aspirations. There is no limit to the number of traits a Sim can have. The aspirations are: