Hi Kassi! This is Calli, and I am just gonna point up at my intros above :P
So Kimiko is the sister of a bunch of Proudfoot boys, of whom I predict Mateo will perhaps be friends with Fitz? She's not particularly friendly, but also she will think he's pretty hot, so there you go. Anyway, she lives in Snowcap and you can see her around with her dog Hero, who is the Best Girl.
I think Tony will get on with him like a house on fire! He will flirt because he flirts with everybody and he doesn't really mean anything by it. He's pretty occupied on that front as he is currently dating... Freddy's other little sister. ;P As well as Dr. Scruffyface over there on the creature side of healing. Also, perhaps Mateo would like to hang out with him in the gym. And so many things. Anything you want.
Will hopefully will not end up in medical, but if he does he will like Mateo just fine, probably! He's pretty shy but very sweet and gets along with most people. IDK man, let's figure something out with any or all of these folks! :D