| The subject of this article is non-canonical.|
While created as part of licensed material, it has not been confirmed as part of the "real" Buffyverse.
San Sui was an ancient Chinese vampire.
He was rumored to have challenged his prey to test his skills. In the 20th century, he showed up in Sunnydale to challenge the local kung fu trainer to mortal combat. But Buffy Summers, the Slayer, interfered just as San Sui was about to finish him off. San Sui was about to kill Buffy when Xander Harris staked him from behind.
About three years later, he was supposed to fight Buffy in a demon fighting arena arranged by Adam.