Definitely Eryka. She just kind of shows up, you purify her, and then do nothing with her again. Atugia is also one that just feels forgotten and abandoned despite her writer still doing other things for the game. Really sucks because those two are right up my alley, especially 'Tui. All the dryads seem pretty underwhelming except for Orlatih(go figure) but even her whole "Give blowjobs to her and something happens" kinda goes nowhere besides extra scenes. Centaur village as a whole seems underutilized, doesn't even feel like an actual village honestly. Ihzalti, Nihara, Fallah, Nottia(cowgirl farmer), and the Countess are the only other ones I can think of that just seem underwhelming.
Would be pretty nice if we could somehow get some Feronia action(KM Brothel owner) ourselves in the future since but not sure how they'd go about it
I haven't even seen a hint of anything planned for Atugia.
I assume she'll be involved with Carmen stuff when it happens, and I know Carmen is supposed to have a bunch of stuff eventually (marriage, possibly involves in conflict with Evergreen) but it really does seem like she gets the short end of the stick.
The dryads supposedly have lot of stuff coming from Wsan, but for obvious reasons he can't work on them now. He's outlined a bunch of stuff he has planned for them though, including corruption stuff, preg stuff, Orlaith sub route (yuck), but since he's not gonna be free until probably early-mid next year, it's gonna be a wait.
I'm pretty sure he'll get to it though simply because we all know how much Wsan absolutely loves horsies.
I know Ahmri has more stuff coming which may or not be related to the corruption of centaur village.
Fallah does feel kinda just "there". The Wayfort still has a bunch of stuff planned, supposedly, and the demons from the Undermountain are supposed to be moving in; so I feel like there's a chance for her to get some love at some point.
Eryka has stuff actually written and upcoming, and Ihzalti has stuff "planned" supposedly.
Nottia though? I don't know, I feel like her little story arc feels complete. She needed help with her farm, and you get her help, either from centaurs or guards.
Her design is fantastic though, wouldn't mind more of those scenes...
Feronia, idk. I would think it depend on if the state of KM actually changes after we finish up there. She might just be more for flavor if it stays the same. But if it actually drops the quarantine, maybe we'll get some major NPC shifts.