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Doubt (ダウト Dauto) is a member of the Orpheus Order and one of the main antagonists in the second season of the anime series Phi Brain:Kami no Puzzle.
Doubt has messy, brown hair and blue eyes. He always has an intimidating look on his face, seeming most of the time angry. His outfit consists of a blue jacket over a gray shirt, white pants and black shoes.
Doubt is the most loyal member of the Orpheus Order, willing to follow Klondike's every order, even when he found out that his Orpheus Armband was a fake. He also doesn't tolerate nonesense and unpunctuality. Despite that, Doubt recognizes and respects any talented opponen t, as he did with Gammon and Kaito.