Hiroshi Agasa lives next door to the Kudo family as their neighbor and close family friend. An eccentric inventor and scientist, he operates from a large house doubling as his personal laboratory. His appearance features a bald head, prominent eyebrows, a mustache, glasses, and a frequent white lab coat. Agasa possesses a kind, gentle, and often absent-minded personality, typically engrossed in his latest inventions, many of which turn out impractical or comically flawed. He shares a long-standing childhood friendship with Yusaku Kudo, leading to a close, almost avuncular bond with Yusaku's son, Shinichi Kudo. Agasa becomes the first person Shinichi confides in after being transformed into a child. Recognizing the danger, Agasa devises the alias "Conan Edogawa" and facilitates his placement with Ran Mouri. Agasa provides crucial scientific and technological support to Conan, creating specialized gadgets to aid investigations and maintain his secret identity. Key inventions include a voice-changing bowtie, a stun-gun wristwatch, power-enhancing kick shoes, tracking glasses, and a miniature transceiver earpiece, which he frequently upgrades and maintains. Beyond gadgetry, Agasa offers significant logistical and emotional support as Conan's primary confidant, advisor, and chauffeur, driving a distinctive yellow Volkswagen Beetle. His home serves as a frequent safe meeting point and base of operations. Agasa actively supervises the Detective Boys group Conan befriends, chaperoning their outings and assisting in minor cases, usually letting Conan lead deductions. Agasa's role expands when he takes in Ai Haibara after her defection from the organization behind Conan's condition. He becomes her legal guardian, providing shelter, protection, and paternal care, forming a strong familial bond. He assists Haibara in her research for an antidote to the transformation drug and safeguards her secret. While generally avoiding direct confrontation, Agasa demonstrates resourcefulness and courage protecting the children. He possesses broad scientific knowledge, including medicine and computer science, occasionally employed in investigations. Despite his forgetful nature and occasional social awkwardness, Hiroshi Agasa remains a steadfast, reliable pillar of support, instrumental in facilitating Conan's investigations and ensuring the safety and well-being of both Conan and Haibara.