He treated us good, just like we were his own family. Even stupid me who couldn't die right.
~ Raiden about Kato

Raiden is a henchman of Kato in the video game Shadow Hearts: Covenant. Raiden is never far from his fellow Mutant Apes Ouka and Hien and lives to serve his master like all the Mutant Apes. Raiden was a member of the Japanese military injured in the Seraphic Radiance's rampage.

Raiden was badly injured but Kato saved him and got him medical attention. When the doctors said there was no hope and Raiden faced death Kato took Raiden to get experimental surgery and cybernetic implants that saved his life and completely restored him. Raiden was trained as part of the Japanese Military's new initiative called 'the Mutant Apes' which were to be made up of reanimated undead super soldiers. Though Kato was working on undoing death completely instead of just bringing people back from the brink of death Raiden and Hien were his first two soldiers revived and reassigned as Mutant Apes. When Kato's experiment payed off with the creation of Ouka, Raiden welcomed her into the Mutant Apes and became devoted to protecting his master's prized experiment.