I thought Tsukasa was supposed to be an out and out asshole anyway. At least, that's what my Karate Bugman friends insist at me. :V

That said, I think you're doing alright with Q - he feels like an AU Discord in a way, and I think that's the right way to tackle him. The two are very likeminded, and when they aren't, it will be openly obvious. Regardless, being a general trickster for him isn't too hard, as long as you keep in mind that he's not the type to hurt others with those tricks - though if others hurt themselves, well, that's not on him.