I mainly use all the negative evil traits for non main character sims just because I want conflict and drama, though it doesn't make a big difference I still use them.
For my main sims they usually end up with the childish trait probably because I'm childish myself ??? love toys, games, dollhouses etc etc so I love to see sims doing the same and enjoying it. I wish they would extend on this trait more. They cannot do enough childish things.
Hotheaded Is a close second just because I like to see them get bent out of shape ?
And paranoid is my last favorite. Love the idles and buffs and how they feel safer in basements lol
