Kato acts as butler to Marucho Marukura and offers steadfast assistance to the Battle Brawlers across their struggles. He presents as a slender elderly man with gray hair, prominent mustache and eyebrows, usually clad in a black suit, burgundy red bowtie, and white shirt. When operating aircraft, he dons a dull white pilot helmet featuring a translucent black visor and yellow cross. His involvement persists through every season. During *Bakugan: Mechtanium Surge* Arc 1, Kato partners with Kyosuke Marukura, unveiling technological aptitude that extends his role beyond traditional butler responsibilities, though particular tasks remain unspecified. In Arc 2, he moves to Bakugan City and reemerges as a key supporter of the Battle Brawlers. His presence marks a pivotal scene in "Back In Sync," where he observes Marucho combat Jack Punt. Following Marucho’s win, Kato exhibits clear pride beside Marucho’s father, recognizing Marucho’s battle commitment. Kato shares the rare distinction of appearing in every original series season among human characters—alongside Dan, Shun, Marucho, Miyoko, and Julie Makimoto. He features in both *Mechtanium Surge* arcs, unlike Julie’s absence from Arc 1 and Miyoko’s from Arc 2.