Shun Kazami co-created the Bakugan brawling game with childhood friend Dan Kuso. Initially ranked first worldwide, his position fell to sixth after Masquerade dominated the rankings. Personal circumstances, including his mother's terminal illness and subsequent coma, led him to temporarily resign from brawling under his grandfather's insistence that he focus on ninja training. His mother's passing deeply affected him; he received the Ventus Bakugan Skyress as her final gift, which became his original partner. Rejoining the Battle Brawlers, he specialized as their Ventus attribute brawler, rising back to third place by the end of the initial conflict. Personality-wise, Shun maintains exceptional calmness and rarely displays overt emotion. He operates as a lone wolf, prioritizing independence and ninja discipline, yet demonstrates unwavering loyalty to friends. His combat style integrates stealth, speed, and strategic patience, reflecting his ongoing ninja apprenticeship. He possesses sharp instincts, often discerning deception or hidden motives, as seen detecting falsehoods in Ren Krawler and Jake Vallory. Though initially distrustful of new mechanics like BakuNano, he adapts pragmatically when necessary. During the New Vestroia arc, Shun arrived accidentally when a dimensional portal pulled him from Earth during mountain training. He rescued the Ventus Bakugan Ingram from Vexos capture, forming a new partnership. He aided the Resistance by infiltrating Vestal cities, often wearing stolen Vestal attire: a black turtleneck, gloves, and boots. Key battles included a forced team-up with Ace Grit in Alpha City’s tournament, where they overcame friction to defeat Vexos members Lync Volan and Volt Luster. He later confronted Shadow Prove in Beta City but lost to Mechanical Darkus Hades and Fortress. Captured alongside Ace and Marucho, he escaped with Spectra Phantom’s covert assistance. He reclaimed Storm Skyress during Prince Hydron’s downfall, though she chose to remain in New Vestroia, permanently entrusting Ingram as Shun’s partner. Ingram evolved into Master Ingram after receiving Ventus attribute energy, and Shun later unlocked Ingram’s "Shadow Wing" ability to defeat Lync. In later conflicts, Shun transitioned to new partners: the synthetic Ventus Hawktor during the Gundalian invasion (where he ranked second in Bakugan Interspace), and Ventus Taylean in the first arc of Mechtanium Surge. During the second arc, he partnered with Ventus Jaakor and utilized Battle Suits like Fortatron. He temporarily commanded Darkus Bakugan Skytruss and Orbeum, forming the combined Baku Sky Raider Magmafury. His combat record remained strong, though external factors like mechanical Bakugan advantages or trap fields occasionally caused losses, such as a tag battle against Volt and Mylene that cost the Ventus energy. He played critical roles in major victories, including infiltrating and destroying the Alternative weapon system using his knowledge of its blueprints. Shun’s development centered on reconciling his solitary nature with teamwork, particularly after accepting Komba O’Charlie as a ninja apprentice and collaborating with allies like Baron Leltoy. His bond with Bakugan deepened through transitions between partners, emphasizing mutual respect over dependence. Trauma, like battling an illusion of his mother in the Doom Dimension, reinforced his reliance on friendships, catalyzing Skyress’s evolution. His character consistently balanced ninja philosophy with tactical brilliance in Bakugan battles.