Gen Shishio (志々尾限, Shishio Gen) was the youngest son of the Shishio Family and a member of the Night Troop. He was an Ayakashi Majiri and possessed a wolf-man transformation. Gen was sent to Karasumori by Masamori Sumimura to help the Kekkaishi fight against Kokuboro, but was eventually killed in battle by Kaguro.