I think Kato would ask Morgan a million questions if they talked, mostly about Wiccan stuff and be confused and a bit nervous about the matter of curses and that stuff.

Kato would be weary of Mason for the most part, but Kato would be polite to him if he had to talk to him, and he avoid the topic of the bullies.

And Kato wouldn't be sure how to talk to him, mostly he already know what kind of lifestyle he lived, so he would find it awkward for him to find a topic to talk about.

And that all I can think of at the moment.