Wabisuke was born as the illegitimate son of Tokue Jinnouchi, the former head of the Jinnouchi family, and an unknown woman. Because of his status as an outsider, he was never fully accepted by the rest of the family, leading him to develop a deep sense of resentment and isolation. However, Sakae Jinnouchi, the matriarch of the family, took him in and raised him as her own, giving him a rare source of love and stability.

Despite his strained relationship with the Jinnouchi family, Wabisuke proved to be exceptionally intelligent, pursuing a career in computer science and artificial intelligence. He eventually became a professor at Carnegie Mellon University, one of the world’s top institutions for technology and innovation. However, despite his professional success, Wabisuke remained emotionally distant from his family, choosing to stay abroad for years rather than confront his unresolved feelings.

Wabisuke is a tall, lean man with shoulder-length black hair and a cool, refined demeanor. His sharp facial features and confident, almost smug expressions give him a mysterious and slightly rebellious aura. He usually wears a white button-up shirt with the sleeves rolled up, along with black dress pants, emphasizing his effortless charisma and intelligence.

His relaxed but calculated posture reflects his detached nature, often appearing unbothered or amused even in serious situations. However, his body language subtly changes when interacting with Sakae Jinnouchi, showing his genuine care and respect for the one person who always accepted him.

Wabisuke Jinnouchi is intelligent, sharp-tongued, and deeply conflicted, often masking his emotions behind sarcasm and a detached attitude. He is a man who struggles with his place in the Jinnouchi family, feeling like an outsider due to his illegitimate birth. His cocky demeanor and blunt way of speaking serve as a defense mechanism, allowing him to appear unbothered by the family’s resentment toward him, though deep down, he craves acceptance and recognition. His pride makes it difficult for him to reconcile with his past, causing him to distance himself from the family for years.

Despite his abrasive personality, Wabisuke is not without warmth or loyalty, particularly toward Sakae Jinnouchi, the only person who fully accepted him. He respects her deeply, and her death shakes him to his core, forcing him to confront his mistakes and reconsider his place in the family. Though he initially acts indifferent toward the crisis caused by Love Machine, he ultimately proves that he does care, stepping up to help stop the disaster he unintentionally set in motion. His character arc is one of redemption and reconciliation, showcasing a man who, despite his flaws, is capable of change and responsibility.

• Returning to the Jinnouchi Family
  Wabisuke returns home after many years, invited by Sakae Jinnouchi, though his presence immediately stirs tension among the family members. His cold attitude and biting sarcasm irritate many, especially since he left Japan years ago without a word.

• The Creator of Love Machine
  It is later revealed that Wabisuke designed and sold the AI Love Machine to a U.S. defense contractor, unknowingly setting off the digital crisis in OZ. Though he initially brushes off the consequences, he is visibly shaken when he realizes the destruction it has caused, showing that he never intended for his work to be misused.

• Sakae’s Death & Turning Point
  Sakae’s sudden passing deeply affects Wabisuke, as she was the only family member who fully accepted him. For the first time, he shows raw emotion, expressing guilt and sadness over her loss. Her death serves as a turning point, prompting him to take responsibility and work alongside the Jinnouchi family to stop Love Machine.

• Helping Defeat Love Machine
  Though Wabisuke is not a combatant like Kazuma (King Kazma) or a strategist like Kenji, he contributes by using his technical knowledge to analyze and counter Love Machine. By working with the family, he proves his worth not just as a genius, but as a Jinnouchi.