I think Saph would probably be the closest with them due to their hobbies, backgrounds, and Toni Kensa bond LOL, but Astra and Cerise would still be friendly with them of course. Astra would always want to try and convince them to do turf battles or salmon shifts with her, and Cerise relates to Kiki's background a lot which I'm sure they'd bond over (and he thinks Sasha's tech is neat)