Heiji Hattori, a high school detective hailing from Osaka, earns renown as the "Detective of the East," balancing a fierce rivalry and collaborative partnership with Shinichi Kudo. The son of Heizo Hattori, a police superintendent, and Shizuka Hattori, he cultivated detective instincts early, tackling minor cases like recovering lost pets. His childhood intertwined with Kazuha Toyama, a lifelong friend and romantic interest, after an incident left them bound by unbreakable handcuffs—a shared ordeal later commemorated by matching charms forged from the chain. Renowned for deductive prowess rivaling Shinichi’s, Heiji uncovered Conan Edogawa’s true identity swiftly, cementing a partnership where he shields Conan’s secret while leveraging his insights. Their dynamic blends brotherly camaraderie and mutual trust, with Heiji’s boisterous Osakan accent and playful humor offsetting sharp intuition. Though occasionally impulsive, he prioritizes averting tragedy over rigid protocol. Non-canon explorations, like the OVA *The Stranger from Ten Years Later*, envision Heiji’s future through Shinichi’s dream: a celebrated detective leading his own agency, dubbed "The Lady-Killer of Naniwa" for his perceived charm. Yet, televised interviews reveal lingering tension with Kazuha, their mutual affection unspoken. This speculative narrative underscores Shinichi’s faith in Heiji’s legacy while hinting at personal unresolved threads. Protective of allies, Heiji acts on premonitions—summoning Conan to Osaka after dreaming of Shinichi’s peril—and shields Kazuha from danger. His competitive streak emerges in deduction debates, yet he champions collaboration, internalizing Shinichi’s creed that detectives must prevent harm above all. Distinct traits include a preference for Ellery Queen novels over Sherlock Holmes, mastery of kendo, and a signature light green motorcycle. His rapport with Kazuha dances between affectionate teasing and unvoiced longing, their bond anchored in shared history. While canonical material leaves his future open, non-canon glimpses juxtapose professional acclaim with personal hesitations, framed through Shinichi’s lens.