Puu is Yusuke's spirit beast, hatched from an egg that essentially fed on Yusuke's actions and emotions. The two share a deep spiritual bond—Puu is basically a physical manifestation of Yusuke's soul, which means the creature's health mirrors Yusuke's own condition. No matter how far apart they get, Puu can always track Yusuke down. Because of this connection, Yusuke has come to see Puu as his other half.
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