Kai Cap (born December 13, 2028 in Tokyo, Japan) is one of the adoptive sons of Matthew and Marci Cap. His other vigintuplet siblings are Shinji, Hitomi, Chikayo, Satoshi, Mao, Hikari, Kasumi, Tariko, Shizuka, Takao, Kenji, Yukina, Mako, Sakura, Yoshi, Daisuke, Toshio, Yusake and Hiromi. He was put into a foster care along with his other vigintuplet siblings at the age of 20 months.
He has black hair and brown eyes.
- Father: Matthew Cap
- Mother: Marci Cap
- Brothers: Shinji Cap, Satoshi Cap, Takao Cap, Kenji Cap, Mako Cap, Yoshi Cap, Daisuke Cap, Toshio Cap, Yusake Cap
- Sisters: Hitomi Cap, Chikayo Cap, Mao Cap, Hikari Cap, Kasumi Cap, Tariko Cap, Shizuka Cap, Yukina Cap, Sakura Cap, Hiromi Cap
Team Terrific 10's Medical Unit of Greater SupernannyaEdit
In Supernanny: The Theory AnimatedEdit
- His full name is Kai Takeshi Cap
- He receives a Ho-Oh plush and a wagasa for Christmas 2033
- For Halloween 2033, he was dressed up as a Grey Evil Ninja, complete with black socks, ninja assassin blades and short black gloves
- His favorite book is Little Daruma and Little Rabbit by Kako Satoshi
- His favorite ice cream is cactus
- He has a koinobori, a blue carp-shaped wind sock