What Sim character trait is most important to you, and why?

The traits matter so little. I pick them based on what moodlets I want my sim to have. Maybe I want them to struggle a bit and feel emarrassed/sad/tense. For sadness I could pick vegetarian for example because they're easy to make sad. Another thing I consider is storytelling purposes and what suits their character. A trait that's most important to me is probably loner, because at least it works making sims tense or embarrassed.