One of my favorite traits was in Sims 3, and it was the shy trait.
https://scontent-dfw5-2.xx.fbcdn.net/v/t1.0-9/17554174_768876686595962_8513210065886942113_n.jpg?_nc_cat=0&_nc_eui2=AeHBrNjSu3Z6k6V6cbI23zxaI3Z2PEAQW_5SrL9bjborw7b9fNeFGlB2ulHepP-s96w6X9MGRHjgPqLAjzncEE69iUk41Nw5h9NUmpiEGf3giw&oh=5dc496562991c9a6ffae1d7cfa540160&oe=5BB44A7A
The really cool thing about that trait was when ever my shy sims were with two of their friends, nothing ever bothered them, and they got a wonderful mood boost with being with their friends.
I think I'll head off and play one of them now.