Kai Green is a character in Ben 10: Hero Time.
Kai is tall, slim, tan and has black hair.
Kai is extremely attractive and popular at her school. She met Ben and Gwen when they were all 10. Ben instantly fell in love with her but Kai never felt the same way. In those five years they became very close and at the beginning of the series Ben 10: Hero Time she begins dating Ben.
Kai is a very skilled fighter. She often carries around small weapons such as throwing knives or blades to quickly make into a spear.