Good Traits for Charisma
Certain traits will help Sims raise their charisma quicker and easier. These include:
Charismatic: An obvious choice that is beneficial in several ways. It will help Sims raise their charisma skill faster, they will not cause negative reactions very often, and they will be less boring in conversation. Choosing this trait also starts them out with the charisma skill book that they should study to get to skill level 3 faster. When a Sim has a successful and positive social interaction, their friendship bar will rise quicker.
Flirty: This trait is beneficial for Sims who want to find lovers in addition to making friends. However, if a Sim isn't seeking many romantic relationships, this trait won't help them much with the charisma skill. The Flirty skill will also make them naturally better at giving massages, will decrease the time it takes for flirting to be successful, and will make it so that Sims do not fail as often in flirting.
Friendly: This trait is incredibly beneficial to charisma. It helps make talking with other Sims easier and adds a little extra increase to these and other friendly interactions. This trait also helps them avoid some negative conversations, getting upset with Sims who repeat themselves, and they will generally be nicer in free will mode. Sims will be less likely to bore others and will be able to mix up their conversations better, and they will notice many more social interactions coming up under the Special category.
Good: This trait makes Sims friendlier to other Sims making it a great charisma trait, as well as a great trait for Sims who will spend a lot of time living autonomously. This trait ensures that they are nice to other Sims when they talk and helps to ensure other Sims will like them. They will also not get upset when another Sim says something mean or wrong. This trait also gives Sims a special comforted moodlet which helps to boost the moods of other Sims.
Good Sense of Humor: This trait is especially useful for Sims going for the comedian charisma challenge and it helps them gain friends. It will help to make a Sims' jokes better and provides them with several joke interactions to use. The comedian challenge requires Sims to tell 100 jokes, so those pursuing this challenge should choose this trait and get started telling jokes as soon as possible.
Schmoozer: Sims with this trait are people pleasers. This trait helps them compliment others and kiss butt at work. Sims will gain flatter interactions and praise and their compliments won't fail. It also helps them make friends.