Honestly, I think Kattar would be pretty good friends any member of the 'Blitz Team' from Zoids: New Century Zero (with the exception of Doc and Lena), he'd connect pretty well with Takeo from 'my love story' though he'd probably laugh when Takeo didn't want him to. He'd honestly be able to befriend basically anyone of they were nice.
I think Alicia would really connect with "Naho" from "Orange" and "Yamato Rinko" from "My love story." She and Naho would discuss emotional things, and she and Yamato would visit cafes and bakeries.