First, you don't need my permission to draw my MCs.
Second Prepare for some yapping as I just got home from a workout and I am too tired to shorten my thoughts.
I feel like Kathryne and Maeve would be good friends as their both socially inept and selectively mute, IF they were force to interact. Although I feel like Maeve would have to introduce themselves first as in step one, KitKat can only speak German and Greenlandic (an Inuit language) as she's a German girl who grew up in Greenland. She does know like 20 English words but that's it, so she doesn't like talking to strangers since she doesn't know what they're saying. I could also see KitKat having a girl crush on her since Maeve would be someone who understands her struggles.
Bacon might be a bit too much for Maeve to handle at first, but he's used to looking out for KitKat who has a similar personality, so he'd likely recognize that she's uncomfortable and dial it back a bit. He'd honestly see her like another sister he has to protect.
Kathryne and Haruki would be an interesting pair due to KitKat's hair. I feel like they could eventually become friends with Haruki constantly chasing her down to brush her hair. Haruki would probably have a panic attack when he saw how wild and unkempt her hair was for the first time, and would immediately try and brush it, something Kathryne hates. Then he'd be left confused when he realizes that KitKat's hair isn't tied or clipped into loops, but instead grows that way naturally. Then he would be more confused when she tries to explain it to him in two different languages, neither of which he understands.
I feel like He and Bacon would get along quite well. I like to think that Bacon would have to hold KitKat down while Haruki brushes her hair.