Magoroku Shido emerges as a central antagonist across the first two seasons, wielding authority as student council president of Aibo Academy’s middle school division. His tactical arrogance and academic prestige fuel a pattern of underestimating rivals, resulting in consistent defeats despite calculated strategies. Aligned with the organization Disaster, he adopts their black-and-red uniform but discards the signature cape, maintaining a distinct presence. His combat arsenal rotates through multiple buddy monsters—Bluechase Dragon Garg of the Danger World, Silver Dragon Adelaide from the Ancient World, and ultimately his true partner, Death Ruler Gallows of the Darkness Dragon World. Beneath a composed exterior lies a volatile psyche prone to deflecting blame onto subordinates like Gremlin for tactical failures. His brittle superiority complex surfaces in refusal to acknowledge defeat, from tearful breakdowns after reporting losses to his father to berating allies. Unwavering devotion to Disaster’s leader Ikazuchi borders on fanaticism, persisting through verbal abuse and threats, even as he orchestrates Ikazuchi’s monster assaults during Season 2’s clashes against Yamigedo. Fusion rituals with Gallows trigger physical metamorphoses: first as Death Shido, marked by a skull helmet and crimson cape, then evolving into Des Shido with reinforced red armor and diminished horns. These shifts mirror Gallows’ own progression and Shido’s fluctuating allegiances. His signature "Hundred Demons Calling" technique conjures entities through a sinister seal, though overdependence on this external power frequently undermines his efforts. Chronic losses to protagonists Gao Mikado, Genma Todoroki, and Noboru Kodo expose strategic vulnerabilities in his Buddyfight record. Season 3 hints at tentative redemption as he reclaims his student council role sans overt antagonism, yet Season 4 reignites his rivalry with Gao, ending in further defeats. A fractured dynamic with his father, Sueroku Shido—a Buddy Police official manipulated by Kyoya Gaen—fuels his early contempt for moral boundaries, shaped by Sueroku’s authority-centric ethics that indirectly steer Magoroku toward Disaster’s agenda. Pivotal arcs include manipulation by Disaster higher-ups, temporary fusion with Sofia to manifest Death Shido, and high-profile tournament entries like the ABC and Gaen Cups. His habit of cycling through decks and buddies—matching Gao’s record for most flags utilized—showcases adaptability tainted by inconsistency, often culminating in tactical missteps.