Emperor Gaia is the leader of the soldiers of the Empire and the ruler of the Underworld. Gaia has the ability to easily tear his enemies limb by limb with his strong sharp teeth.

He fights several soldiers of Gin and Reima. He kills Raiga, Sakon and Ukon. When Gaia tries to attack Gin, Reima jumps in front of him and the two leaders are now face off. As they fight, an earthquake breaks loose and causes a landslide. Gaia is then crushed by the heavy rocks that fall from the ceiling of the Underworld.

Gaia is likely the son of Purple Wolf, making him tenth-generation descendant of Black Wolf.

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