Шішіо Ґен

Gen has a very serious appearance for a young teenager, possessing sharp eyes (due to being half Ayakashi) like an animal's, with sharp spiky black hair, and a dark skin tone. His clothing mainly consists of two outfits, the one he wears during battle consists of a ninja like costume with purple pants and a short sleeved robe with arm guards on both his arms and legs. His outfit also carries The Shadow Organization Star symbol. During his stay at Karasumori Academy, his regular clothes mainly consisted of the Middle School's uniform. He also carries a special flame tattoo around his body, given to him as a young boy in order to keep him from fully transforming.

Gen had a very solitary nature, and was slow to trust or even interact with anyone. He had trouble understanding the way other people behave, and spent a great deal of time observing them and reflecting. He was particularly puzzled by the partnership between Yoshimori Sumimura and Tokine Yukimura (since their families are supposedly still feuding), and could not understand what Yoshimori sees in such a "scary girl." Even when around people he considered friends, Gen only opened up so much. Like Yoshimori, Gen thought nothing of stepping in to save someone despite any danger to himself, though his reasons stem from Masamori entrusting him with his duties.

After some time, it was revealed that Gen was reluctant to get close to others out of fear that they might witness his powers, and either label him as a monster or be hurt by him. After he fully transforms in front of Yoshimori and Tokine and is immediately accepted he begins to come to terms with and accept himself but is very soon after killed in battle by Kaguro.