Shun Kazami stands as a central protagonist across the Bakugan series, culminating in *Bakugan: Mechtanium Surge*. A highly skilled Ventus-attribute brawler grounded in ninja training from his grandfather, he co-created the foundational rules of Bakugan gameplay with Dan Kuso. Initially ranked the world's top brawler, he later fell to sixth place due to Masquerade's dominance and personal circumstances involving his mother's terminal illness and death, which caused him to temporarily cease brawling. Approximately 18 years old in *Mechtanium Surge*, Shun's appearance evolves. In the first story arc, he wears a light green shirt layered under a white shirt with dark green trimming, a dark green choker, tan pants, and light brown boots, his black hair grown longer than before. For the second arc, he adopts a green jacket over a green shirt, white pants, and black shoes. His reserved, analytical personality persists, emphasizing strategic combat and ninja principles like speed and stealth. Maintaining a lone-wolf approach, he nonetheless shows unwavering loyalty to allies like Dan and Marucho. His sharp instincts enable him to detect deception, such as sensing anomalies in Dan and Drago after their return from Neathia. His formidable brawling expertise endures, though his Bakugan Interspace ranking initially drops to fourth due to reduced participation while focusing on ninja training. He later climbs to third and ultimately reclaims the top position after defeating rivals Anubias and Marucho, subsequently dropping to second following a loss to Dan. His primary Bakugan partner in the first arc is Ventus Taylean. In the second arc, he partners with Ventus Jaakor and utilizes the Ventus Fortatron Battle Suit provided by Mira Fermin. He later bonds with Darkus-attribute Bakugan Skytruss and Orbeum, summoned via a distinctive whistling method. These three Bakugan combine into the Baku Sky Raider Magmafury. Jaakor generates the Mechtogan Ventus Thorak, while Shun shares the Aquos/Ventus Duomechtra Mechtogan combination with Marucho. Shun confronts escalating threats, including the rogue Mechtogan Zenthon and antagonist Wiseman. He participates in critical battles against the Nonet Bakugan and the Mechtogan's ultimate weapon, Mechtavius Destroyer. During the climax, he joins Dan and Marucho in utilizing the Current of Time to avert a catastrophic future where Bakugan City and allies like Runo, Julie, and Mira are annihilated. His development throughout the series reflects a balance between solitary discipline and deepening reliance on teamwork during global crises.