Ren Tao

Len is a Shaman from China, one of the few remaining members of the Tao Family, who after their years of serving as the guardians of the Forbidden City, became outcasts and condemned as witches and devils. Those two centuries of suffering were the fuel of the hatred En bared for those outside of their clan and even more for those of the Tao family who associated themselves with outsiders like his brother or Len's father (in the Japanese version, En is Len's father, in the English version, is his uncle).

Len was taught to hate and see the worst in people, with the Tao family Crest magically tattooed on his back by his uncle as a reminder of his "destiny" to be Shaman King so he can punish the world for what it did to the Tao clan. But that all changed when he met and fought Yoh, whose laid back nature and friends convinced Len that En was wrong about people.