Ayato Kirishima (霧嶋 絢都, Kirishima Ayato) is Touka Kirishima's younger brother, and goes by the alias Black Rabbit. He grew up with his sister in the 20th Ward but at some point in time, he left the district. According to Kazuichi Banjou, Ayato subsequently began to wander all the wards of Tokyo, bringing sheer wreckage and chaos upon them, until his unique powers and abilities caught Tatara’s eye. Ayato was therefore pulled into joining Aogiri Tree, where he is currently an Executive.