Movie
Description
Heiji Hattori, a 17-year-old high school detective from Osaka, bears the title "Great Detective of the West." His father, Heizo Hattori, leads the Osaka Police Department, while his mother is Shizuka Hattori. He inherited dark brown skin from his paternal grandfather and proudly speaks in a distinct Kansai dialect despite occasional ridicule. He typically wears a backward Osaka baseball cap, flipping it forward when challenged.

Childhood experiences shaped his detective instincts, including frequent searches for lost cats. A pivotal incident involved handcuffing himself to Kazuha Toyama without a key, forcing prolonged proximity during daily activities. Kazuha later crafted two matching lucky charms from the handcuff links, which both wear as symbols of their bond. Heiji once glimpsed a girl through a building window as a child, developing feelings he later realized were for Kazuha.

Heiji initially traveled to Tokyo to challenge Shinichi Kudo, the "Great Detective of the East," following an unseen deduction contest during a skiing trip three years prior. After Shinichi corrected his deductions in a case, Heiji gained profound respect for him. During their second encounter, Heiji discovered Conan Edogawa’s true identity as Shinichi after waking prematurely during Conan’s use of a voice-changing bowtie. Heiji now helps conceal this secret, though he occasionally slips by calling Conan "Kudo" in front of Ran Mouri or Kazuha. The detectives collaborate regularly, with Heiji providing backup during Shinichi’s temporary age reversals and impersonating him when needed—complicated by his Kansai accent.

Heiji possesses exceptional deductive reasoning, sharp observation, and broad knowledge, coupled with an eidetic memory that recalls complex sequences after one viewing. More impulsive than Shinichi, he sometimes overlooks details due to competitiveness or protective instincts. Saguru Hakuba criticized this impulsiveness during the "Detective Koushien" case for disrupting a crime scene, but Heiji defended his actions, asserting a detective’s duty is to prevent death. He fiercely protects friends, frequently ordering Kazuha away from danger.

A skilled kendo practitioner ranked fifth nationally, Heiji captains his high school team. He subdues criminals with bokken or improvised weapons, displaying agility like jumping bookshelves or balancing on a katana. He rides motorcycles proficiently and speaks fluent English.

His relationship with Kazuha Toyama features mutual but unspoken romantic feelings. Heiji exhibits jealousy when Kazuha interacts with other males yet struggles to confess. He privately treasures the lucky charm she gave him, once insisting Conan wear it for protection. In "The Million-Dollar Pentagram," he planned to confess at Mount Hakodate—a location Ran Mouri suggested based on Shinichi’s London confession. Momiji Ooka, who claims Heiji as her future husband, attempted off-screen interference.

Regarding the Black Organization, Heiji aided Conan in probing Jodie Starling or Eisuke Hondou but never directly confronted the group and occasionally underestimated their threat.

During "The Million-Dollar Pentagram," Heiji traveled to Hakodate for a kendo tournament. He identified Kaito Kid’s disguise during Kid’s wakizashi theft attempt, confronted him on a rooftop, recovered one sword, and dueled him. Slicing off Kid’s hat revealed a face resembling Shinichi, shocking Heiji and enabling Kid’s escape. Heiji later entrusted the sword to police. He and Conan solved a murder with a cross-shaped chest wound and a treasure hunt tied to WWII industrialist Keizaburo Onoe. Using a pentagram motif and historical swords, they coordinated with the Detective Boys in a hot-air balloon to align a laser with Mount Hakodate. Heiji battled a masked swordsman who attacked Kid, recognizing the assailant’s method from the murder case. At Goryōkaku, he summoned Soshi Okita for backup against arms dealer Brian D. Kadokura’s men.

Heiji references philosophical discussions with Conan about preventing criminal suicides, believing a detective who fails to stop one is akin to a murderer. This principle guided his intervention in a serial killer’s suicide attempt.