Kai Green is an archeological adventurer who travels the world with her grandfather, ex-plumber Wes Green, to uncover ancient secrets and face supernatural threats. She meets Ben during one of his adventures and they regularly team up whenever the supernatural is involved. As dedicated to saving the world as she is discovering the wonders of it, Kai is a hero worthy of Ben’s status.

• Kai meets Ben when they are both 16-Years-Old.

• Due to her mystical and cryptozoological knowledge, she regularly partners with the Secret Saturdays to protect hidden species.

• She met Ben on an expedition to find the Yenaldooshi, a Navajo werewolf. She initially dismissed him due to Ben’s immaturity, plus she was more interested in the Omnitrix rather and his aliens.

• The Yenaldooshi was actually an Alien called a “Loboan”. It scratched the Omnitrix which slowly transformed Ben into a Loboan through a 12 hour process. She tried to help Ben as much as she could and got to know him personally in the process, seeing how much of a hero and a cool guy he is.

• Once Ben became human again, she asked him out but he rejected, due to him being in a relationship with his girlfriend Julie at the time. They left on good terms.

• She’s trained in many forms of martial arts and weaponry (especially swords and archery), including some Alien martial arts.

• Despite her Grandpa, Kai has no interest in being a plumber.

• During her team-ups, Kai gets along with Kevin then most due to his knowledge on Alien lore and mechanical expertise. She has a love for cars and motor racing, much to Kevin’s delight. She studies with Gwen and helps her learn mystical histories from Ledgerdomain. Rook spars with her when they get a chance.

• Out of all of Ben’s aliens, Kai’s favourite is Benwolf due to his connection with the Yenaldoosh. She’s also a fan of Frostbite, Shriek, and Pesky Dust.

• A year after he and Julie break up, Kai and Ben decide to date at around 18-Years-Old.

• She’s a very active person, with hobbies including rock-climbing, muay thai, hiking, speed driving, and swimming.

Kai is a dedicated girl who preserves and values her work, exhibiting strong attachments to the objects she collects from her travels as well as the places themselves. She does whatever she can to fulfill her goals, always trying to find a way to overcome adversity, especially when artifacts or culture is involved. Additionally, she is quite intelligent and resourceful for her age. Despite her typically serious and stoic attitude, Kai also exhibits a playful side, often teasing Ben and making snide remarks at his expense, masking her feelings for him. However, her true feelings are often revealed when she is especially excited or elated, usually gravitating towards Ben when he’s around.