Rik Heisenberg holds the dual roles of marshal and veterinarian for the antagonistic Black Gema Gema Corps, serving the King and Queen of Analogue. His age is approximately 26 in the original Japanese continuity, increasing to 28 in the English dub of "Leave It to Piyoko!". He possesses light purple or greyish-purple hair, dark brown or red eyes, and distinctive black dog ears and tail. His consistent attire includes glasses, a collar, a tie, and a uniform, frequently augmented by a doctor's coat bearing a Black Gema Gema armband marked with a "B". As the oldest member of the Black Gema Gema Gang, Rik acts as the primary strategist and caretaker, earning the moniker "Daddy". Though projecting seriousness, his personality frequently reveals silliness and dramatic flair, including delivering monologues. Driven by unwavering loyalty to the Analogue monarchy, he dedicates himself to the gang's objectives and particularly to Piyoko's well-being. His veterinary profession stems from a deep fondness for animals, resulting in him being constantly accompanied by creatures like Bun Bun, Amaenbou, and even slime-like entities such as "boo boo" in "Di Gi Charat Nyo". Within the group, Rik functions as the most level-headed member despite his plans often failing. He serves as the primary speaker during team confrontations and maintains a paternal relationship with the other members. While specific plot details involving Rik in the "Flower Viewing Special" are not detailed, his established role places him within Piyoko's efforts against Dejiko during seasonal events like cherry blossom viewing. His presence is similarly noted in broader series media, including the movie "Di Gi Charat - A Trip to the Planet" and the OVA "Di Gi Charat: Kuchi Kara Bazooka," where Piyoko's group schemes against the protagonists. His character remains consistent in his dedication to Piyoko and the gang's comedic, albeit unsuccessful, endeavors across the franchise.