I thought a lot of people had good discussions as to who the real 'vampire knight' is, from Zero, to Kaname, to Yuuki herself! I personally think everyone is a 'knight' in his or her own way, or at least that's how I like to look at it. And do you mean Yuuki's mother Juuri and Kaien Cross, equinox? I was very interested in that too, and I didn't think it well explained in the manga. Perhaps there's more to tell. I love the Chairman-he's absolutely hilarious, but his serious side is as urbane as any night class student