Pierre (ピエール Piēru) is a tertiary character featured in the one-shot Rohan at the Louvre.
He is Noguchi's young son who drowns in a lake when she momentarily leaves him by himself. Pierre briefly reunites with his mother as a ghost conjured by her memories from the curse of the "Under the Moon" painting in the Louvre museum.
Pierre is a small child with a dark bowl cut hairstyle. He wears a long sleeve shirt and shorts, along with pants underneath the shorts.
As a ghost, he has a solemn face with droopy eyes.
Nothing is known of Pierre's personality from when he was alive. However, as a "ghost" summoned by the Under the Moon painting, he momentarily looks happy to reunite with his mother.
While Pierre and his mother Noguchi were at a park, Noguchi had to retrieve things from her car so she momentarily left Pierre alone close to a lake. In the meantime, he had fallen in the lake and drowned. After finding his body, Noguchi only blames herself for causing his death.
A ghost-like creature based on Pierre from Noguchi's memories emerges from Nizaemon Yamamura's "Under the Moon" painting when she approaches it in the Louvre museum. As he walks closer toward his mother, she breaks down and apologizes to him, feeling guilty for his death. Rohan Kishibe's pleas for Noguchi to get away from the ghost are in vain, as touching Pierre causes her body to inflate with water. Her body quickly bursts from the water, due to the curse of the painting making her experience drowning like how her son died. Even in her last moments, she is grateful to see her son for one last time.