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Rei Katsura is a main character in Digimon Universe: Appli Monsters. His Buddy Appmon is Hackmon.
He is voiced by Toshiyuki Toyonaga.
Rei is a teen-aged boy with pale skin, gray-green hair and red eyes. He wears a black hooded jacket over a gray hooded sweatshirt. He also wears dark blue pants with a white zipper pattern, and white sneakers.
Rei is a skilled hacker. He is usually untrustful of others, and initially suspected Hackmon to be working with Leviathan.
Haru and others are lured into an ambush by Hackmon and his Appli Driver Rei Katsura, who challenge them for a fight.
Haru, Eri, Torajirou and Rei are attacked by the Ultimate 4, a team of powerful Appmon under Leviathan's that easily destroy both their buddies and AppliDrives. Just as they are about to be killed as well, Yujin and Shutmon appear and face the enemies by themselves to help them escape.
Rei and the others reunite with their Appmons, who do not remember them at all, and are sent to a journey to restore their buddies' memories. In the occasion, they not only reconnect with Hackmon and the others, but obtain each one their own AppliDrive DUO.