His main goal is clear: Get four Powerbands and revive the Emperor of the Darkest Yin. He mainly goes after the Snake Powerband since he feels it should be his. He has a pet snake called King Cobra and uses it as a spy or to help him in fights.
When empowering a stolen Powerband, like the Snake, he would normally say “Empower the Darkest Yin, Snake.” He is always a great threat to every Guardian, but Ang the Golden Dragon often saves the day.
On an interesting note, despite supposedly being very powerful, he is often easily defeated even in situations in which he has the clear advantage (such as having three Powerbands to Ang only using his Dragon Powerband).