I delete most of the pre-made households so my Sims rarely get to meet any of them. The few that they have become friends with are Johnny Zest, Alice Kim, Salim Benali, Akira Kibo, Vlad Straud, and Caleb Vatore. None of my Sims have ever become romantically involved with any of these Sims though.
My Sims in various saves have befriended quite a few NPCs (townies) like Vampires and Aliens. My Sims also seem to like to chat with Sims coded as a weirdo.
Usually any vampire unless I'm playing with them in a specific vampire save. I mostly ignore them otherwise. I'm also not fond of the 2 mermaids with the strange faces either.
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My Sims in various saves have befriended quite a few NPCs (townies) like Vampires and Aliens. My Sims also seem to like to chat with Sims coded as a weirdo.