Number Seven is a member of the Robot-Fighting Ring.
Seven is housed in a blue/purple chassis with a large "07" on the side, hence the name.
Seven is frequently afraid of Faye Whitaker's repair efforts, and flinches constantly during buffing- much to Faye's annoyance.
More than once Number Seven has accused Faye of being a robot, due to pants vibrating. Faye insists it was a cell phone.