Katsushika Hokusai is a Saber-class Servant in Fate/Grand Order, depicted as a fused entity of the legendary ukiyo-e artist Katsushika Hokusai and his daughter Oi. She appears as a girl with a symmetrical physique, embodying their shared artistic legacy, particularly the famous Thirty-Six Views of Mount Fuji. As a pair set, Hokusai's spirit manifests through Oi, who is blind and serves as his vessel in the story.