Lupin is a supporting character in the original television series Magical Princess Minky Momo and returns in its 1985 OVA Fairy Princess Minky Momo: La ronde in my dream. He is a gentleman thief known for his cunning and flair, often operating under the moniker of a phantom thief. His background is rooted in classic literary archetypes, sharing a name and concept with the fictional French master burglar Arsène Lupin. In the TV series, an episode titled Mysterious Thief Lupin: Great Counterattack centers on his exploits, and he is later shown escaping from prison, which sets up his involvement in the OVA.

As a character, Lupin is clever, resourceful, and somewhat roguish, but he is not depicted as truly malevolent. His motivations primarily revolve around his life of theft and outwitting authority, though he also exhibits a sense of honor and a personal code. In the OVA, he becomes entangled in the larger conflict surrounding a mysterious island where adults are transformed into children, and he contributes to the chaotic standoff between world powers. His presence adds an element of playful mischief and adventure to the story.

Lupin has a notable relationship with his young son, who appears alongside him in the OVA. This father-son dynamic humanizes him, showing a softer side beneath his criminal persona. He also interacts with the protagonist Minky Momo, often as an adversary or rival, but their encounters are more about wits than genuine hostility. Over the course of his appearances, Lupin demonstrates adaptability and a sharp mind, making him a memorable recurring figure. His abilities include skilled thievery, disguise, and escape tactics, and he is often shown outsmarting guards and authorities. While not a major character, his role provides comic relief and thematic contrast to the fairy-tale elements of the story.