Shun Kazami appears as an 18-year-old in Bakugan: Mechtanium Surge, retaining his signature calm and observant nature while displaying advanced ninja skills. His look evolves across the season's two arcs. In the first arc, he sports a light green shirt under a white shirt with dark green trimming, tan pants, light brown boots, and a dark green choker, his black hair grown longer. His attire transitions in the second arc to a green jacket over a green shirt, white pants, and black shoes featuring yellow details. He consistently partners with Ventus-attribute Bakugan. Initially, he battles alongside Ventus Taylean, a Bakugan from Neathia. In the second arc, his primary partner becomes Ventus Jaakor. He also acquires the Darkus-attribute Bakugan Skytruss and Orbeum through whistling. These three combine into the Baku Sky Raider Magmafury. Jaakor generates the Mechtogan Thorak, and Shun later shares a Mechtogan combination, the Ventus/Aquos Duomechtra, with Marucho. Mira provides him with the Ventus Battle Suit Fortatron. His brawling rank in Bakugan Interspace starts at fourth place, blamed on reduced battling due to ninja training. He deliberately forfeits a ranked match against Anubias to test Marucho's capabilities but later defeats Marucho to advance. His sharp observation discerns inconsistencies in Dan and Drago's battles, leading him to suspect Dan hides the truth about Drago's unstable powers and their link to the destructive Mechtogan Zenthon. This suspicion causes tension when Shun confronts Dan, suggesting a hiatus, which Dan misinterprets as distrust. Shun employs tactical precision in combat. He teams with Dan against Sellon and Chris in a tag match, using Taylean to siphon Drago's excess energy and prevent Zenthon's release, securing victory. During a Battle Royale, his Taylean creates the Mechtogan Silent Strike to counter opponents. When Team Sellon members Soon and Chris discover their leader's betrayal and alliance with Mag Mel, they adopt Shun as their leader. He guides them in combat against Chaos Bakugan and Mechtogan Titans during the season's climax. Shun's background as a co-creator of Bakugan's rules and his history of temporary retirements inform his reserved yet loyal approach. His development culminates in a mentorship role, directing Soon and Chris while maintaining his foundational traits of strategic combat and quiet leadership.