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Description
Kanzo Hattori, commonly known as Hattori-kun, is an 11-year-old apprentice ninja from the Iga Province who serves as the central figure in the film Nin x Nin: Ninja Hattori-kun, the Movie. He is sent by his father, Jinzo Hattori, to the city of Edo, the modern-day Tokyo, as part of his final training. The conditions of his mission are specific: he must serve the first person he meets as his master, and he is forbidden from ever being seen by anyone other than this master, on pain of banishment from the Iga clan. This person is Kenichi Mitsuba, a young boy who becomes Hattori-kun's charge.

Hattori-kun is characterized by a pure-hearted and disciplined nature, strictly adhering to his ninja principles even when navigating the unfamiliar landscape of contemporary life. Having been raised in a remote, mountainous region, he is initially naive about modern urban society. He speaks in an archaic form of Japanese, which surprises those he meets, and common household items such as rice cookers and refrigerators, along with city elements like neon lights, completely baffle him. Despite his formidable training, he possesses a specific and strong fear of frogs, a weakness that can render him helpless.

His primary motivation throughout the film is twofold: to successfully complete his training by protecting and serving his master, Kenichi, and to investigate a mystery concerning his clan. He learns that the rival Koga ninjas are flourishing while the Iga ninjas are dying out, and he seeks to uncover the reason behind this imbalance. This mission drives him to confront a series of strange incidents in the city, including attacks that leave victims marked with a Koga crest.

In the story, Hattori-kun's role is that of a protector and mentor to Kenichi, who is portrayed as an isolated and shy boy with low self-esteem. While Hattori instructs Kenichi in lessons of confidence and self-defense, Kenichi in turn helps the bewildered ninja acclimate to the 21st century, creating a reciprocal relationship between the two. A key relationship is his rivalry with Kemuzou Kemumaki, a ninja from the opposing Koga clan who initially disguises himself as a schoolteacher. Although they are enemies by heritage, their dynamic evolves during the film when they are forced to cooperate against a greater threat, Kurokage, a rogue Koga ninja responsible for a series of poison dart attacks. Hattori also develops a friendship with Midori, Kenichi's artistic and blind friend, who aids him in his investigation.

Throughout the narrative, Hattori-kun demonstrates significant development. He begins as a rule-bound apprentice strictly adhering to his father's command to remain unseen. However, when Kenichi is kidnapped, he breaks this cardinal rule to rescue him, knowingly accepting the consequence of exile from his clan. This act of prioritizing friendship and compassion over a rigid directive shows his growth. In the end, his father forgives his transgression, allowing him to return to Edo and continue his life there. This arc reinforces his steadfast, compassionate nature as a defining trait.

As a ninja, Hattori-kun possesses exceptional skills in ninjutsu, which he uses to assist Kenichi with various problems and to combat his rivals. He is a capable fighter, skilled enough to engage in tense close-quarters combat with experienced enemies. He always carries a katana as part of his distinctive blue ninja outfit, which features yellow sleeves and a cape. His physical stature is recorded as 140 cm tall and weighing 40 kg. Despite his expertise, his debilitating fear of frogs remains a notable and exploitable weakness.
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