Kumarba is a 5-year-old male bear cub with green eyes and an inherently curious nature. He lives at home, where he frequently watches children's videos on his father's old tablet. He discovers and imitates content like nursery rhymes and dances, often earning daily praise from his mother for these activities.

A pivotal moment occurs when a mysterious voice emerges from the tablet during viewing. The voice, later identified as Tabris, invites him: "Would you like to go to the YouTube world with me?" This invitation initiates Kumarba's journey into the Internet realm, transforming him from a passive viewer into an active participant. His core motivation centers on exploring this digital landscape alongside Tabris, fulfilling his innate curiosity about online content.

Within the Internet world, Kumarba encounters the antagonist Bagurin, who creates viral chaos. This conflict shifts Kumarba's role toward proactive engagement, collaborating with companions like Tabris and Nekorun to counter Bagurin's disruptions. His development reflects an evolution toward problem-solving and teamwork, focusing on restoring stability to the digital environment.

Kumarba's narrative purpose emphasizes fostering imagination and expression among preschool-aged audiences. His adventures integrate educational themes through music, interactive challenges, and digital navigation, fueled by his curiosity. His design, overseen by an artist associated with prominent mascot creations, visually reinforces his child-friendly appeal.

Expansions beyond his original YouTube presence include terrestrial television broadcasts and global content localization initiatives. These developments maintain his core attributes while adapting his adventures for broader accessibility. His story remains confined to his established digital explorations.