Nikumaru Sarutobi serves as the central protagonist within the series. This seventeen-year-old student attends Ninja High School, an institution specializing in ninja training. His appearance features a short stature and chubby build, leading to the nickname "meatball." Despite this physique, he displays remarkable agility and formidable combat skills. His signature technique is the "kamikaze," generating powerful whirlwinds through rapid foot movements, frequently utilized during confrontations and challenges.

The narrative follows his experiences and escapades within the school setting and beyond. He engages in various pranks, rivalries, and conflicts with fellow students and external adversaries, driving the series' comedic and action scenarios. These adventures involve navigating ninja training dynamics, interpersonal relationships, and competitive situations typical of a martial arts-themed world.

Details regarding his family background, childhood, origins, character evolution, long-term development, or transformative arcs across episodes are not documented. Similarly, his portrayal or involvement in alternate media formats like movies, OVAs, or spin-off productions is not detailed; his depiction remains confined to the original television series.