Don't have the motivation to write another super important character right bow so here's two slightly smaller ones
Toriel!Sarvente & Ruv:
-In LLNL, Kris lives in the city in which FNF and it's Modverse is located instead of Hometown. More specifically, lives with Sarvente & Ruv
-Meaning Selever will probably only exist as the Secret Boss of Chapter 3
-Sarvente is I would say honestly worse taking care of their mental wellbeing than Toriel, as she is, expectedly, your average overbearing mother, as Kris has to live with things like having to look "Presentable", feeling pressured to join in on some familially-tied stuff that they don't want to, and not being able to do things other kids can do because they're "Unholy"
-But most of all, they think she wouldn't approve of the Dark World. She's told them many times not to get involved with Magical shit, and they don't even wanna think about how she'd react upon learning the Prophecy involves essentially fighting God
-As you can expect, Sarvente was not happy about the fact that Kris's "ideal self" had red horns. Her throwing them away was when their relationship started to go South, as well as the first time she told them not to get involved with Magical shit
-In fact, Kris opening a Fountain at the end of Chapter 2 is the result of an argument that occured when Sarvente told them she didn't approve of Susie. The only reason she was allowed to stay was because they had predicted that, and went prowling around outside to make it look as if it was too dangerous for her to leave
-Ruv, on the other hand, thinks they should have more freedom than that. A privilege as small as being able to pick out their own clothes shouldn't be something they have to fight for, just because they partake in some activities that normal kids their age do doesn't mean they're gonna end up doing something worthy of jailtime, etc. And sure, them having a friend that pretty much goes against everything they stand for isn't a good look, but Kris isn't their Good Looks Generator. They're their child
Oo, I see...These are incredibly interesting concepts. :]