I'm trying to find all the special characters. The only ones I haven't come across in any of my playthroughs are the gambler, the parasocial fan, and the delivery driver. And there are just the special characters I know of because of the gender options, I know there's others.
Also the classroom admirer won't register jewelry as a great gift. It worked for the other two people in the polycule. I have all the hearts filled except the great gift one.