Nariaki Utsumi (内海 成彰, Utsumi Nariaki) is the former assistant of Gentoku Himuro at the Touto Institute of Advanced Matter Physics who acted as his decoy Night Rogue (ナイトローグ, Naito Rōgu). After being saved by Evolto, he now operates as Kamen Rider MadRogue (仮面ライダーマッドローグ, Kamen Raidā MaddoRōgu).