Na I think Byakuya actually has respect for Yorouchi deep down, but his own pride in trying to best her gets in the way. Which is probably what Yorouchi senses as well, and why she continually plays around with him and mocks him.

I'm surprised that Byakuya is that young here. I would have expected to be just slightly older given the timeline at hand.

And Kisuke sounds very interesting. He sounds sick and twisted, but in a good way. Despite that you don't get an evil genius vibe from him, just that he thinks in a way nobody else does. And thats what probably freaks other people out about him.