Ryuunosuke Nagumo

He was killed by the shadows in middle school. After Haine killed him, he was copied and his shadow entered Hizuru, allowing them to switch control of her body. His ability to see two seconds ahead stems from Haine's human side splitting from her main self with a two-second time error. After Hizuru is killed, Ryuunosuke is transferred into Shinpei's mind and helps protect him. In the end, Ryuunosuke is alive as an adult with a reincarnated version of Haine as his daughter.