Easily my favorite of the 1999 LIs, and probably my favorite overall, is Jenny. Sure, she's cute as hell, but more importantly to me, she's sweet as can be, and head over heels in love with MC--checks a lot of boxes for me.
I like "in love" a lot more than "friends with benefits" or "fuck buddies," putting Jenny (or Skylar) above 1999 Scarlett (hot as she is), Krystal, or Khloe--and remember, MC and Krystal were having sex almost as quickly as MC and Riley. The thing that I think hurts my opinion of Riley is that, especially early on, she presents as just plain crazy. She was forward, yes, but that was just one piece of the "crazy," and it was the latter than was the turnoff for me. Now, her popping up in the last update, and her dialogue, make her seem much less crazy, and much more devoted to MC, than had previously been the case. And maybe I'll come to revise my opinion of her.
I'd like to see that Darci's romantically interested in MC. I suspect that is the case; she's just been too good (for my preference) at hiding it. I'd accept "sexually interested." But what she's been showing is neither, which is fine if she isn't a LI, but she is. I want to like her that way, but I'm not there yet.