Mari would DEFINETLY not like Bacon. doesn't rlly matter if she's aware of the disability or not (she wont bully him though, just ignore him) She'd be mildly nice to Kitkat tho, generally just dismissing her. She'd probably look out a lot for her if she knew she was completely blind tho so.
Elias and Kitkat would only be able to get along once they know each other's disabilities, and they'd trauma bond and stuff like that. Otherwise without that knowledge i don't think they'd ever get along due to Kitkat being a bit cold and Elias being a casual, nice and chill guy.
Kel is basically an outgoing popular short king who a lot of people loved (and he liked back, halfway platonic and halfway romantic) he's generally very charismatic so yeh :p