AskHeadmasterCross

Kaien Cross (黒主 灰閻理事長 Cross Kaien) is over 200 years old, the oldest and most powerful known Vampire Hunter, nicknamed "The Fangless Vampire". In spite of being a vampire hunter, Kaien maintained friendships with several pureblood vampire families, especially the Kurans. Kaien adopted Yuki and also took Zero and Saboten into his home after they lost their families. Kaien retired as a vampire hunter and became the Headmaster of Cross Academy, he established the Day Class and Night Class with Kaname Kuran with dreams of promoting peace between humans and vampires. Kaien is an eccentric character who often provokes Zero and irritates other characters with his silly mannerisms, though he is a serious character when it comes to matters he cares about. He carries a hidden anti-vampire weapon in his cane[8] which he uses to fight against the President of the Hunter Association who had turned corrupt from drinking Rido Kuran's blood.[9] It is also pointed at, although never said directly, that he was in love with Juri Kuran.

After the one year time skip, he is not impressed by Kaname's rebellion against the rest of the purebloods, and tells Zero that he will go to stop him. The hunters later reveal to Zero and Yuki that they think that he should just let Kaname do what he wants. Kaien and Kaname fight with swords, and Kaien tells him that he will never return Yuki to him, though she still believes in him somewhere in her heart, and that it is his turn to change her back into a human. When Kaien slashes Kaname, he is revealed to be Toma, who has been used by Kaname. Kaien carries Toma back to the Hunter's Association.

When Zero brings Sara to the Hunter's Association, he thinks that Sara and Kaname killing each other is a sick joke.