Gaucher Bigotte is a character from the one-shot manga Rohan at the Louvre, where he serves as the curator for the Department of Asian Arts at the Louvre museum in Paris. He is a man of average height and build, with shoulder-length black hair that is combed back and wavier at the bottom. He also possesses a beard that is darker on his chin, angled eyebrows, and beige-colored eyes, typically wearing a light-colored suit with a white buttoned shirt.

In terms of personality, Gaucher is portrayed as a cautious and secretive individual. He takes several security measures before allowing the manga artist Rohan Kishibe to view a mysterious painting, insisting that Rohan leave behind all personal items. To ensure nothing goes wrong, he limits Rohan’s observation time to just five minutes and arranges for two firefighters from the museum’s security services, as well as an interpreter named Noguchi, to accompany them. His secretive nature is shown when he refuses to tell Rohan which part of the museum they are traveling to on their way to an abandoned warehouse. Despite his wariness, he demonstrates an in-depth knowledge of the Louvre’s history, including knowing exactly when the museum was founded and why the Z-13 warehouse was abandoned.

His motivations are rooted in his professional responsibility and a hidden personal history. As a curator, he is dedicated to the safety and security of the museum’s artworks and visitors. However, his past holds a key secret: at some point in his life, Gaucher was involved in a car accident that resulted in the death of a man. This event becomes directly relevant to his role in the story.

In the narrative, Gaucher is the one who grants Rohan authorization to research the painting Under the Moon by the fictional artist Nizaemon Yamamura. Surprised that the Louvre possesses a work by an artist he has never heard of, stored in a long-abandoned section, he accompanies Rohan and the others to investigate. The group’s journey leads them to the warehouse where the painting is kept. When they finally locate the artwork, supernatural events unfold. One of the firefighters has his skull pierced and is sucked into the darkness of the ceiling. Gaucher is the first to notice a mob of ghosts attacking them, initially believing them to be simple thieves and attempting to call the police. Before he can act, he is smashed against a wall, and tire marks inexplicably appear across his body, crushing him. In his final moments, he recognizes one of the ghosts as the same person who was killed in the traffic accident from his past, before he too is sucked into the ceiling’s darkness. His body is never found, and he is subsequently considered missing.

Gaucher’s key relationships are primarily professional. He interacts directly with Rohan Kishibe as the visiting artist seeking access to the archives, with the interpreter Noguchi, and with the two firefighters who serve as security. His development is brief but tragic, as his own hidden guilt—symbolized by the spectral car accident victim—directly leads to his unique and gruesome demise. A notable ability is not a supernatural power, but rather his extensive and specialized knowledge of the Louvre’s history and collection, as well as the thorough security protocols he commands as a curator. In the live-action film adaptation of the story, his role is changed significantly; he becomes the curator who purchased the black painting in the past, and his function in the manga is largely replaced by another character named Ryunosuke Tatsumi.