The protagonist, a transfer student who has not been able to make friends in his first month at St, Chronica's. Of all of the members of the club, he is the most gentle, balanced and socially competent in personality; but his unusual hair color, inherited from his late English mother, leads classmates to assume he is a violent and abusive delinquent and spread defamatory rumors about him. Because of his long experience of antagonism, Kodaka has become accustomed to fighting and can defend himself quite well.

His father is working in the United States, and so he takes care of his younger sister alone at home, which has also made him a good cook. His childhood was characterized by frequent movement, and as a result he has few memories related to home life and close friendships; however, though he does not realize it at first, he and Yozora were childhood friends before his family moved.