Tai-Fu

Tai-Fu had originally been East Kai and had trained Sora until he introduced her to his master, Quip. Tai-Fu had also trained Kage, and was also the one who killed him. For that, Kage hates Tai-Fu and has sworn to destroy him.

Tai-Fu was kicked out of being East Kai after he had fooled around too much and well... ticked off the others. He wondered the universe for a very long time and has finally returned to the Next Dimension after being killed on Earth.

Since then, he has reunited with Sora and Kage. He is a prime factor in Kage's power struggle, and his prime target.