Martin Kanou, known in the English adaptation as Marcel Bonaparte, is a new student who enters Ra Yellow during the third season of the anime. His role in the story is defined primarily by his possession by the spirit Yubel, which turns him into the main antagonist for the second arc of that season. In this possessed state, he becomes a manipulative and powerful duelist, carrying out Yubel's agenda against the main characters. His appearance is characterized by multiple layers of clothing and a wide range of expressions. In the English dub, he speaks with a French accent when not possessed, while the possessed version does not retain that accent. Limited information exists regarding his personal background, independent personality, or individual motivations, as his character arc is almost entirely tied to the possession and the actions he takes under Yubel's control.