Kai Green

Kai Green is one of Ben's first love interests, who makes her first debut in Benwolf. Kai is the granddaughter of Wes Green, a friend and former partner of Grandpa Max.

Original Series
She first appeared doing a spiritual Native American dance in the episode Benwolf. She was Ben's first crush, but she only took interest in him after he started becoming Blitzwolfer because she wanted to, as quoted, "train and tame him". When she admitted to this, Gwen gave her a stern talking to.

She made a cameo appearance in Ben's dream world in Perfect Day.

Ben 10

 * Benwolf (first appearance)
 * Perfect Day (dream; cameo)

Meaning in different languages

 * In Hawaiian "Kai" means "Ocean" or "Sea".
 * In Maori "Kai" means "Food".
 * In Portuguese "Kai" is pronounced "cai" which means "Falls".
 * In Romanian "Kai" looks like the word "cai" which means "Horses".
 * In Japanese "Kai" means "King". It can also mean "Sea" or "Ocean".
 * In Lithuanian "Kai" means "When".
 * In Marathi (an Indian language) "Kai" is pronounced "kaay" which means "What".

Trivia

 * In Ken 10 it is seen that Kenny's skin color is a mix of white and native American.﻿ According to the pop-up version Ben would eventually marry Kai in a possible future, and she is Ken's mother.
 * According too Derrick J. Wyatt Kai will marry Ben eventually.