Tako-chan, codenamed Octo-1 in English adaptations, is a compact robotic octopus engineered by Hiyoshi Goh, the youngest scientist of the Voltes team. Programmed as a support unit and auxiliary sixth member, the robot displays fervent loyalty to Hiyoshi and teammates, persistently inserting itself into missions despite sometimes causing chaotic mishaps. Its debut occurs in episode 7 when Hiyoshi unveils his invention, though team leader Kenichi’s initial doubts spark friction. During a pivotal battle, Tako-chan inadvertently triggers mechanical complications in Hiyoshi’s Volt Machine, forcing its temporary dismantling for urgent repairs. Hiyoshi later reconstructs the robot, securing its permanent position on the squad.

Equipped with flight systems, environmental scanners, and reconnaissance tools, Tako-chan assists in field operations and docks with Voltes V during critical power-up phases. Though limited in articulation, its design incorporates mission-specific adaptations for underwater maneuvers and combat assistance. Narratively, the robot transitions from a contentious liability to a valued comrade, participating in high-stakes missions.

The live-action *Voltes V: Legacy* amplifies Tako-chan’s persona through playful fourth-wall-breaking moments, with Octo-1 directly addressing viewers during self-introductions. While maintaining the core origin as Hiyoshi’s creation, this adaptation highlights the robot’s dual role as both tactical asset and team mascot. Regional naming conventions vary, with “Octo-1” in English dubs and “Takko-chan” in select Japanese releases. Beyond primary series appearances, no confirmed media expansions exist for the character.