Cador hails from the Flower Planet, a realm also known as the Flower Star, populated by plant spirits and fairy-like beings. He is sent to Earth with his dog companion, Nouveau, on a vital mission to locate the Flower Child, a descendant possessing both human and Flower Star heritage. This individual holds the destiny of finding the legendary Seven Color Flower, crucial for crowning a new ruler of the Flower Planet. Their search identifies Lunlun in France, whom they recruit for the quest.

Journeying across Europe and parts of Northern Africa, Cador acts as Lunlun's constant companion and advisor. He primarily adopts the form of a white cat on Earth to communicate with humans. His personality is marked by practicality and caution, often offering grounded advice during their adventures. This measured approach provides balance against Nouveau's more impulsive nature.

Cador possesses deep knowledge of Flower Planet customs and magic, including the workings of Lunlun's transformative Flower Key pin. He demonstrates consistent concern for her safety, particularly during encounters with the antagonists Togenishia and her servant Yabouki. His role extends beyond guidance to active problem-solving and intervention in perilous situations, such as facing Togenishia's Dark Wind attacks.

He maintains this supportive function throughout all official media, including the main 50-episode television series and the theatrical short film "Hello Cherry Country," where he accompanies Lunlun to Japan. His origins, mission, core role, and personality remain unaltered in any spin-offs or adaptations. Following the quest's successful conclusion, where the Seven Color Flower is discovered in Lunlun's grandfather's garden, his subsequent activities are not detailed in available sources.