Kuki "Numbuh 3" Sanban

"Don't your ever call these Rainbow Monkeys very stupid, because here comes the one and only Kuki Sanban, or Numbuh 3, the green sweater-wearing, hand-covering Jap girl who wants to play your butt dead. Well, she would've helped me crush these Coalition of the Red Star forces that get into our way. Darn straight."

--Su Ji-Hoon, Operation: D.O.O.M.S.D.A.Y.

Kuki Sanban-(Beetles) (三番茎 [Sanban Kuki]) aka Numbuh 3 is a happy-go-lucky, 10 (ten)-year-old 4th-grade Japanese-American girl who is in charge of Diversionary Tactics and is the Medical Specialist of Sector V. She also takes care of the hamsters that power the treehouse. She is the youngest operative, and one of the two female members (alongside Numbuh 5) and the only Asian-American in her sector. As an adult, she becomes President of the Rainbow Monkey Corporation, and the first thing she did when she took over was tear down a Rainbow Monkey Potty Training amusement park.

In When the Cold Breeze Blows Away, she is a medic serving for the Kids Next Door, and yet she still serves as the President of the Rainbow Monkey Corporation in her spare time. Also, she intentionally regressed her age back to herself as a 10-year old girl in order to rejoin the Kids Next Door, while she's still with her husband, Wallabee Beetles, or Numbuh 4.