Joker likes Roxas! It's generally pretty simple with Joker when it comes to people that are outside of the whole Hokage Uruha situation back home. Roxas has managed to surprise him a couple times with his observations but Joker still thinks he's a little naive. BUT THAT JUST MEANS HE'S FUN TO TEASE. Roxas seems like he's serious all the time so it's fun to get reactions.