Cerebrix/Plump is Chip/Min-Woo's robot. Like his/her master, Cerebrix/Plump is more of a thought focused character rather than feeling. Bipedal, with no arms, he/she is equipped with advanced memory, sensory, computing and processing systems stored in his/her large head. He/she can also fly by means of a retractable propeller stored in an upper compartment of his/her head. His/her main functions include a huge sensory array and he/she is also equipped with two antennae through which he/she can tap into almost any communication wavelength and cause disturbances, creating confusion in his/her foes. His/her advanced probability computing system is also capable of determining the outcomes of events before they occur. His/her personality and speech are much more machine-like, but what he/she has to say is usually very important.
In the original Korean version, Cerebrix is female, her name is Plump and she is voiced by Bae Ju-Young, while in the 4Kids Entertainment English version, Cerebrix is male, and he is voiced by Jimmy Zoppi.