It is Nobuhiko. Shadow Moon.
For months, Kotaro lived as a fugitive, haunted by nightmares of the incomplete transformation. He could feel a strange, alien power coursing through his veins—a power that ached to break free. He learned that Gorgom hadn’t given up. They had turned Nobuhiko into their ultimate weapon: Shadow Moon, a perfect, loyal warrior of darkness. And now, Gorgom wanted Kotaro dead. kamen rider black ep 1
He rises. He is no longer Kotaro Minami. He is Kamen Rider Black. It is Nobuhiko