A boy who was orphaned at the age of 5 at the Mont Saint-Michel. He unwittingly released Salamander from his prison, mistaking him for someone else. For many years, Olivier and Salamander traveled the world together. Olivier thought of Salamander as the father he never had until he realized he was being turned into a werewolf to be used for destruction and nothing else.

He was named Loup-garou by Salamander (French for "werewolf"), but is called Olivier by Tsubomi and co. because it's easier to say and because it's the French name of his heart flower.

He develops a great liking for Tsubomi and becomes friends with the other Precure as well.