Yama is a Skypiean and the commander of God's Warriors, under Eneru. A large, imposing fellow, Yama is merciless in battle, defeating the famed Shandian warrior Genbou in Eneru's survival Game. Coming off of this victory with an air of overconfidence, he made the mistake of provoking the ire of Nico Robin when he destroyed the ancient village of Shandora, landing the commander a crushing defeat at the hands of the archaeologist.
First Appearance: Chapter 254; Episode 167

Source: http://onepiece.wikia.com/wiki/Yama