Rik Heisenberg holds the position of marshal within the Black Gema Gema Corps, an organization executing evil plans, primarily under Piyoko's direction. He possesses a tall and serious appearance, featuring light purple hair, dark brown or red eyes, and glasses, alongside standard dog-like ears, a tail, a collar, and a tie as part of his uniform. Despite this stern exterior, his personality frequently exhibits silliness rather than gravity. Animals are a constant presence, often perched on his shoulders, reflecting his deep affection for them. This affinity extends to his profession as a veterinarian, where he consistently shows kindness to the animals he treats. His loyalty is firmly directed toward the King and Queen of the planet Analogue, driving his dedication to the Black Gema Gema Corps' objectives and Piyoko's well-being. Within the group, he fulfills a paternal role, specifically watching over Piyoko as a father figure. His responsibilities include calmly devising evil schemes, though these plans typically unfold with comedic or inept results rather than genuine malice.

Across series installments and specials like the *Christmas Special*, *Leave it to Piyoko!*, *Nyo!*, and the anniversary series *Reiwa no Di Gi Charat*, his core characteristics remain consistent: his role as marshal, his veterinary practice, and his fatherly guardianship of Piyoko persist without significant change. He continues to calmly contemplate villainous plots. His age is noted as 26, and his preferred foods include sushi and yakisoba.