Rik Heisenberg is the marshal (or general) of the Black Gema Gema Corps, dedicated to serving the King and Queen of Planet Analogue. He acts as a father figure within the group, supporting the young Princess Piyoko on her missions alongside Ky Schweitzer and Coo Erhard. A 26-year-old veterinarian by profession, Rik possesses a deep fondness for animals. He is frequently accompanied by creatures like Bun Bun, Amaenbou, and the slime-like Boo Boo, often seen perched on his shoulders. Despite his serious appearance—featuring neat greyish-purple hair, black dog ears and tail, glasses, a collar or large dog necklace, and typically a suit with a purple tie or a white doctor's coat bearing a Black Gema Gema armband—his personality balances level-headedness with an inherent silliness. He tends to deliver dramatic monologues and serves as the group's primary strategist, though his plans frequently fail. Loyalty to the Analogue royalty drives his commitment to villainous duties and ensuring Piyoko's well-being. This dedication remains consistent across his appearances, including his debut in the Christmas Special, the alternate continuity of *Di Gi Charat Nyo!*, and the film *Di Gi Charat: Hoshi no Tabi (A Trip to the Planet)*, where he participates in attempts to capture Dejiko. His character emphasizes his role as caregiver, animal lover, and loyal retainer without significant development arcs across the various specials, OVAs, or series. Information detailing his specific actions or role within the *Summer Vacation Special* is not present.