|This article is about a/an villain in GoGo Sentai Boukenger.|
|Furious Demon God Rei|
|Season:||GoGo Sentai Boukenger|
|First Appearance:||Task 17: The Ashu Mirror|
|Last Appearance:||Kamen Rider × Super Sentai: Super Hero Taisen|
|Number of Episode|
Full list of appearances
Grand Beast Rei (大いなる獣レイ ,Oinaru Kemono Rei, 17-42): Rei is the most evil of the Ashu. Furious Demon God Gai and Hyouga freed this powerful tiger-like demon from the 100-Demon Mirror by using the captured Natsuki's blood as sacrifice.
Rei is a calm, yet vicious and calculating demon who loves to make people suffer. He has power over fire and can breath forth an illusion-filled miasma that preys on the self-doubt of his victims. Satoru tried to use the Dual Crusher Mixer Head on Rei, but Rei simply broke out of it with his fire powers.
Though defeated by Satoru Akashi wielding the Crossbow of Fighters, and terminated by Ultimate DaiBouken and the Ashu Spirit Extinguishing, Arch Priest Gajah revived him as Quester Rei (クエスター・レイ ,Kuesutā Rei). In this form, Rei wields a sword that also turns into a gun and can also shoot lighting from his hands. He also kept his Ashu ability to project a person's memories and thoughts. He was able to put Natsuki into a trance that made her believe that her purpose as the last of the Lemurians was to bring destruction to the future humanity.