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Pu (ぷう, Pū), or Pusuke (ぷう助, Pūsuke), known as Puu in the English anime, is Yusuke's spirit beast. Puu is a small, beady-eyed, bird-like creature with an all blue body, whitish-blue belly, a yellow beak and feet, tiny "arms" and a small patch of black hair on his head which mimics Yusuke's hairstyle.