Kato is a minor character in Gundam Build Fighters.
Kato was a regular Gunpla Battle competitor, and a veteran of the tournament circuit. Nicknamed the 'Magician of Armies', one of his favored tactics was to utilize an entire squadron of mobile suits to overwhelm his opponents with sheer numbers. His primary model was a custom-colored GX-9901-DX Gundam Double X, which in turn controlled a dozen FX-9900 GX-Bit through a replica of the Flash System. Kato was aided in the control of all these models by two supporting builders.
During the final round of the Japan 2nd Block regional qualifier for the 7th Gunpla Battle World Championship, he had the misfortune of facing Sei Iori and Reiji in the debut of their RX-178B Build Gundam Mk-II. Kato's GX-Bits were swiftly shot down, and the Double X soon followed.