A close friend Sims is someone who you can spill the beans about everything with. The Sims that makes your Sims feel comfortable. You can have this kind of friendship once you've reached a level 4 friend relationship with another Sim. You can deepen your friendship by starting a social event at home. You can level up your relationship with them by doing more friendly interactions.
Generous These Sims give a bit better daily Login Rewards
Lucky These Sims occasionally give you bonus XP while at home
Good These Sims occasionally get a bonus when being friendly with others
Outgoing These Sims are a bit better at Friendly Events
Good Upbringing These Sims are way better at all Events