Keo over 10 years ago Always did perfered Hina and Hayate more myself.And Katsura with the gundam-otaku guy. Sorta.
Karis over 10 years ago ...I kinda expected this pairing a long time ago. Despite their similar experiences in their past, I can't see them in a friendly relationship, since they are teacher and student. And Hayate himself said he wouldn't get in a bath with her, LOL.