TV-Series
Description
Gantetsu Suzunone leads the Saiga ninja village and crafts ninja tools, embodying an old-fashioned pride in his work. His name, signifying "rock" or "crag" (巌) and "iron" (鐵), mirrors his traditional values and steadfast character. He is the father of Ryoko Suzunone, a Ninjutsu Academy student whose pursuit of the family's ninja traditions he opposes, wishing instead for her to live an ordinary life.

The Saiga village, once a celebrated technological center for ninjutsu tools, now faces decline and nears extinction, with Gantetsu and Ryoko among its final inhabitants. Economic pressures mount as the rival Koga clan redirects its orders to overseas factories, threatening Saiga's survival. Gantetsu negotiates with Koga representatives like Enbi Takamine, who presents blueprints for an undisclosed project. This proposal forces Gantetsu to a critical juncture: acceptance would make Saiga economically dependent on Koga, while refusal could doom the village entirely.

Gantetsu maintains professional connections with Iga ninja, including Tokisada Kaga, who seeks information and tool repairs. During one encounter, Gantetsu discloses that Koga leader Kidō Minobe once commissioned an advanced "Ninja Core" designed to store unprecedented energy levels. Gantetsu rejected the project, judging it beyond current technical feasibility and ethically dubious. His expertise in traditional craftsmanship surfaces when Ryoko excels in a ninja tools exam at the academy, solving complex problems with knowledge likely inherited from him.

Facing Koga's coercive tactics, Gantetsu receives a fraudulent bulk order for ninja toys, compelling Saiga into production before the deception is uncovered. This incident strains relations with Koga but demonstrates his commitment to honoring contracts once initiated. His role intersects with the wider ninja conflict when he shares vital intelligence about Koga's interest in Iga's secret Ninja Core, aiding Iga's understanding of Koga's strategic motives.

Gantetsu possesses grey hair and grey eyes, consistent with his portrayal as an older, experienced figure.