Daizaemon Kanzaki is a pivotal figure behind the scenes in his world, known professionally by the alias Mr. Miracle. As a highly accomplished coach, he has trained a remarkable seven champions to achieve the title of Cosmo Beauty, the highest honor in the universe. His reputation is built on an intense, no-holds-barred approach to guidance, one that does not spare his own body and demands the complete suppression of emotions from his athletes to achieve victory by any means necessary. This extreme philosophy, while effective in producing winners, often puts him at odds with more traditional authority figures, such as his school principal.

Physically, Daizaemon's dedication to his work has taken a severe toll. His body is so worn down that he survives on a diet of chocolate mixed with medicine, a stark symbol of the sacrifices he has made for his career. This unusual dependency also makes him vulnerable, as his health is tied to these medicated supplements.

Beyond his role as a coach, Daizaemon has a deeply personal and secret history. He is the husband of Tomoe Mido and, most significantly, the estranged father of Akari Kanzaki, a promising young athlete. To dedicate himself fully to a critical mission, he abandoned his family, an act that created a profound rift between him and his daughter. Because of this, he feels unworthy of being called a father and initially keeps his distance, showing a strange, conflicted interest in Akari's progress rather than openly acknowledging their relationship. He did not even watch her early practices, driven by guilt over his choices.

Daizaemon's primary motivation stems from a cosmic conflict against a powerful adversary named Saint Neriri. He believes that to fight this enemy, he must forsake all personal attachments and focus solely on creating the ultimate athlete. This singular drive defines his actions, leading him to develop athletes like Akari, Chris, and Anna, as well as others like Larry and Miranda, at the university satellite. His role in the story is therefore that of the demanding mentor and the hidden father, whose actions are ultimately revealed to be part of a larger, desperate battle.

His key relationships are fraught with tension and unresolved emotion. With his daughter Akari, there is a significant emotional distance and resentment, as she doubts whether she should even acknowledge him as her father. With his wife Tomoe, the bond is complicated by his long absence. At a critical juncture, Tomoe falls under the influence of Saint Neriri's brainwashing. In a dramatic turn, Daizaemon breaks the brainwashing with a deep kiss, and after the ordeal, Tomoe openly and affectionately confesses her love for him in front of reporters, leading to a heartfelt reunion.

Throughout the narrative, Daizaemon undergoes notable development. While he begins as a distant, seemingly cold coach obsessed with results, his true identity and the sacrifices he made come to light. He confronts his own failings as a father but ultimately reconciles with his family. In the end, he is depicted living together with Akari and Tomoe, having resolved his past conflicts and reclaimed his role as a husband and father. Regarding his abilities, his primary strengths are not athletic but strategic and psychological; he is a master tactician and an elite coach capable of molding raw talent into champions, even if his methods are ruthless and his personal life is left in shambles.