Koko

Koko is a lime green Japanese chugger with blue eyes. She is well known as the main character of The Trouble with Nothing and Tens Moments. Koko, like Wilson and Brewster, is too young to go on missions.

Biography
In Koko's debut episode, she makes things disappear. Enrique returns everything to normal and brings Koko home.

Koko and Wilson together can make ten.

Personality
She acts like a baby because shes one of the youngest numberjacks along with Wilson and Brewster.

Despite being a baby, she is shown to be quite smart for her age, as shown in Koko the Train Hero when she was able to use the Brain Gain Machine. She can also say her own name, but doesn't talk properly yet due to her age.