Chibimaru is a young ninja and the younger brother of the protagonist, Pyunpyunmaru. He has a male gender and works alongside his sibling at the Nandemo OK Office, an agency that takes on any kind of task or request. In this role, Chibimaru helps resolve various unexpected incidents and problems caused by other ninjas. As a ninja, his occupation suggests he possesses a range of stealth and combat skills, though no specific special abilities are highlighted.

In terms of personality, Chibimaru is characterized by a distinct verbal tic, as he tends to end his sentences with the phrase...da mon. This speech pattern adds a recognizable and consistent trait to his dialogue. His motivations are closely tied to his work at the agency and supporting his older brother in their missions. His most significant relationship is with Pyunpyunmaru, who is explicitly identified as his older brother. The two brothers function as a team, tackling the various odd jobs and adventures that come their way. Information regarding his personal development or any changes he undergoes throughout the series is not available from the provided sources.