What sims do you not like for things that happened in your game?

For me, it's Supriya Delgato. My sim is best friends with Justin and thus tries to get along with her, but they barely gain any relationship at all even if I try. I just find her so, so dull. I love it, though. It feels like my sim is equally as bored with her as I am, since they seem to refuse to become friends. I'd love this to be more common as a chemistry system for personalities are implemented.

What are your experiences? :)