Which Sims now have special conversations?

I recently learned that The Sims 4 now has special responses for some Sims. I read that Lily from Moonwood Mill has her own, and I've seen unique responses from Grimmie. 

Since I deleted most premades when I started my new save, I now am stressed out and think I must be missing out. I don't yet have Werewolves installed, so I'm prepared to just keep those Sims and give them makeovers, but I need to know which other sims I'll need to either try to put back in my game (and if that works) and which other sims to just keep in the future.

Are these just new Sims and Grimmie or did they backtrack and enhance the older premades? If they did that, I might be screwed, LOL. Are there hidden traits I need to cheat Sims or is it stored some other way???

THANK YOU SOO MUCH!!