Pierre is a character from the one-shot Rohan at the Louvre.
Pierre was the son of Noguchi. One day she left him alone for a moment close to a lakeshore in a park to take her things out of the car, but in the meantime he had fallen in the pond and drowned. When she came back to see his body she put all the blame of his death on herself.
Pierre's "ghost" (actually a recreation created by Nizaemon Yamamura's painting "Under the Moon" using Noguchi's memory) is brought back. It confronts Noguchi, who breaks down and apologizes to her son, emotionally unstable. Rohan's pleas for her to get away from the ghosts are in vain, as Pierre inflates her body with water, drowning her. Even in her last moments, she is grateful to see her loved son for one last time.