Pu is a fictional character from the anime series YuYu Hakusho, known for being the spirit beast companion of the protagonist, Yusuke Urameshi. Pu is a small, blue creature resembling a penguin with large ears and wings. He plays a vital role in the series by providing emotional support and demonstrating the bond between Yusuke and his spirit energy. As Yusuke's spirit beast, Pu symbolizes his pure intentions and good nature, despite the hardships he faces throughout the series. Although Pu doesn't engage in battles, his presence is a constant reminder of Yusuke's growth and development.