Captain Hardner is He is the Captain of the Blue Guardians, and the main antagonist of the Blue Guardians arc.
Synopsis
He was recruited by Iulius for Demon Card's DR (Dark Rendezvous) plan. His Mother DB Anastasia allows him to "restore" anything, including his missing arm, ruined buildings that had long since been leveled, the atmosphere after Haru tried a smoke screen, and all his opponents old wounds which they have ever suffered and is usually fatal (although it appears he has to touch the subject). He also carries a sword with a blunted tip since he prefers to slash off heads instead of stabbing people, thus earning the nickname "Executioner".
He aims to merge with Endless, to forget the incident of which killed all of his comrades, wife, and unborn child, which made him and his best friend the only survivors. Unknown to him, his unborn child was alive and raised up by his best friend. Hardner also tried all means to torture his daughter to reveal the hideout of which hid an ancient staff deep underground. Realizing what he had done to his own flesh and blood, Hardner broke down in defeat as Haru spares him, only to be stabbed in the back by Lucia to retrieve the mother DB piece in volume 28. It is later revealed he survived the attack.