A friend is a person whom you possess a bond of mutual affection but purely platonic. This is a level 2 relationship. You can start a social event with an acquaintance after 2 interactions with them. This will unlock additional friendly interactions. Being a friend with other Sims will lead to various kinds of relationship, such as romantic interest or rivals.
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