Chiku-chan functions as one of Don-sama's two primary lieutenants in the Evil Corps, an organization bent on universal domination starting with Earth. The character's contribution to the squad's effectiveness remains dubious. A defining and intense obsession with gaming forms the core of Chiku-chan's personality during Earth operations.

After the Evil Corps' initial failure to conquer humanity, Chiku-chan joins the group's abrupt pivot towards basic survival—scrambling for food and rent money. This shift involves taking part-time jobs and engaging in mundane terrestrial life, forcing the postponement of the original invasion plans.

Direct interactions with Earth's quirky human population further distort the Evil Corps' mission objectives. Chiku-chan consistently operates within the central trio alongside Don-sama and Pepu-chan throughout all documented episodes. The character's presence or development is not explored in media beyond the original 12-episode television series.