Numbuh Three (real name Kuki Sanban) is one of the main five children from Codename: Kids Next Door and is the most childish in terms of personality. Her home nation is Japan (making her and Samurai Jack the only Japanese characters in FusionFall). She has two uptight parents and a younger sister in her family. Her biggest weakness is her love for every type of animal and her favorites are the Rainbow Monkeys, stuffed toy monkeys.
War Against Fuse
The PastIn the Past, she's at Mount Blackhead with Numbuh Four, Coco, Mac, and Ed. She wonders about Mandy's cold personality and thinks she needs a hug.
Her sweet personality has easily made her friends with Bubbles, in which Numbuh Three helps mend the injuries of Bubbles' squirrel, Bullet, during Squirrel Squad; she then directs the player to the local Infected Zone to investigate the culprit of the attack on Bullet.
My Monkeys! (Nano Mission)When the player heads for Monkey Mountain to complete the Numbuh Three Nano mission, she asks for the player's aid in saving a family of Rainbow Monkeys, including Baby Monkey, who was in the possession of Fusion Numbuh Three.
There are two helmets based on the head of a Rainbow Monkey that can be acquired by defeating fusion monsters.
- She and Numbuh Five are the only ones from the KND whose Nano types aren't the same colors as their sweaters.
- In Numbuh Three's Nano mission, Numbuh Three tells the player to "Defeat Fusion Juniper Lee," when actually the player will be fighting Fusion Numbuh Three.
- In FusionFall Retro, her model texture was altered to better resemble her official artwork.
- In the FusionFall Retro Beta v3.0 update, she was moved to be across from Numbuh Four .