Kai Green is a Navajo girl who is one of Ben's first love interests. Kai is the granddaughter of Wes Green, a friend and former partner of Max Tennyson. She is also currently Ben's girlfriend.


In The New Omniverse, she is slender yet athletic in build. She wears a long sleeved white shirt with a white and red colored sweater. She now has red boots (now with white stripes) and her shorts are longer now. Her hair is in a high ponytail and she also has a tan earring. She wears tan socks and a belt.

and Abilities

Kai has considerable tracking skills taught to her by her grandfather.

She has been taking Judo lessons, showing considerable skill against trained soldiers of the Forever Knights.


In season 2 of Ben 10: The New Omniverse, she gains an Omnitrix with 10 alien forms:


  • In the future, Kai will marry Ben and will have a son known as Kenneth Tennyson.
  • Kai is shown to be able to slightly move the sword Excalibur from its stone, having grabbed on it to prevent herself from drowning. In the future it is revealed that she is indeed worthy.
  • Blitzwolfer is Kai's favorite out of all of Ben's aliens. She also thinks that Pesky Dust is cute.
  • While originally only interested in Ben's Blitzwolfer form, she has since shown signs of growing feelings for Ben as himself, becoming bashful when people imply they are a couple. She also on impulse kissed XLR8 on the lips as thanks for showing her the way to the Temple of the Sky.
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