Hee, they are. And I think TRC!Kamui would be as baffled by Sorata as X!Kamui tends to be. XD
In the government building group, I think Kamui probably liked Kusanagi and Kakyou. Kakyou because he was stoned very even keeled and probably took on a lot of the stuff Kamui didn't want to deal with. And Kusanagi because he probably was good at keeping Kazuki away from him. X3 As for the Tower group, I don't think he registered them as individuals. They were just "the Tower group" and Fuuma. That having been said... I don't think he really completely hated Fuuma. And if the Tower people had stayed in their sandbox and stopped trying to get into his, I don't think he would have had a problem with them.
Kamui joins the Defense Force and is told he needs to have a buddy for patrols. Who would he pick?