He wears a grade school uniform for the Black Dogs standard.
He likes his sister, but not when she is a slave driver. He hates to see Leon giving up or hoping she was never born.
Romio, Leon and the Secret 1 & 2
His first appearance was when he accidentally bumped Inuzuka when he was running away from his sister Leon. After Leon caught him, she forces Inuzuka to come as well. They were preparing for Kuri's birthday party. Later, Leon wanted to talk with Inuzuka alone which make Kuri and Kai believe she was going to confess. After follow and hiding behind a tree, they saw that Leon was pissed at Inuzuka because he wants the hatred for both Black Dogs and White Cats to go away. After she left, Inuzuka found out that they were spying on them. He then asks why Leon hates the White Cats so much. Both Kai and Kuri told the story of Leon to Inuzuka.
After telling him about Leon's story, Inuzuka refuses to let the girl be the Head Prefect since that will make her unhappy because she would never see her mother again. Inuzuka will find a way to make the world where Leon could be happy as well.
Romeo, Leon, and Prefects 1 & 2
Kai and Kuri found Leon, who was about to leave the academy. They wanted her not to go, but Leon says it can't be helped. She assumes that Inuzuka and Persia will definitely change the school and she'll only get in the way. Kai exclaims that she wouldn't and calls her 'stupid nee-nee'. He tries to convince her to help Inuzuka and the rest to change the school together, but she declines as there's no way she can. No one would believe her if she suddenly said that she wanted the two dorms getting along. She no longer has any trust from the students, and she doesn't belong here anymore. Then Bouda and his gang showed up for revenge.
He was pissed at Leon for telling the Black Doggy House Master about what happened during the Voting day. Leon told Kai and Kuri to run, so they did. It turns out they went to Inuzuka for help. After the Head Prefect showed up and made Bouda and his gang left, he wanted Leon to be a Prefect. Leon still doesn't want to be a Prefect again until Kai and Kuri remind her what Inuzuka said back then.