Niko appears as a brownish-gray German Shepherd, consistently outfitted in a blue coat and dark grey pants within official depictions. He stands as one of the central characters attending the Animal Space Academy alongside Kotetsu and their fellow trainees. As a core member of this group, Niko trains toward the collective goal of becoming an astronaut, focusing on overcoming obstacles and engaging in academy activities central to their journey into space exploration. His presence remains constant throughout the entire 64-episode series, chronicling the daily lives and development of the academy's aspiring astronauts.