I did a crossover with Ouran Host club. They just seem to blend well
Hobo would eat sweets all day with Honey
Kyoya and Purple would get along I think|
Haruhi and Assistant would have fun just hanging out and talking about how crazy their friends are
I’m not sure if Tamaki and Wallis would but heads with their egos or get along even more and collaborate on something.
Harold and Mori would probably chill in the background
And Seaweed and the Twins would probably pull pranks for the fun of it and annoy people on purpose.