I’ll try not to make this too long because I have a hard time condensing my thought.
She and Bacon may or may not get along, at least in step 1. Bacon is a really happy and friendly person, but can be rather loud and hyperactive and has a hard time reading social cues. So interacting with Bacon in step 1 can be very exhausting at times, he does calm down a bit in step 2 though. So, I’m not sure how MianMian would react to Bacon. They could probably bond over their mutual sweet tooth though.
Although I think Kathryne would have a major crush on MianMian as she loves cute girls, I don’t think the two would get along in the beginning to be honest. KitKat doesn’t speak English in step 1. She’s also afraid of new people, constantly cold and tired, and brutally honest. All this made her appear to be very unfriendly and rude. The two could only be friends if MianMian actively tried to get closer the her in step 1 as she’s extremely closed off by step 2. I imagine MianMian would like KitKat’s clothing, approach her to compliment and ask about them, then be met with nothing but a silent stare as KitKat only understood about 6 of the words spoken to her.