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. Also his/her advanced probability computing system is 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, but in the 4Kids Entertainment English version, Cerebrix is male, and he is voiced by Jimmy Zoppi.

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