King Nikochan's Servant acts as the monarch's steadfast, unnamed assistant across multiple series. He consistently displays greater intelligence than his master, persistently offering rational cautions against King Nikochan's impractical plans, though these warnings are routinely ignored.

In the original *Dr. Slump*, the servant loyally follows the king's often misguided orders, supporting repeated attempts to return to their home planet. These efforts are invariably thwarted by their experiences in Penguin Village. Within *Pola & Roid*, both characters confront the protagonists traveling to Earth. Their attack is ultimately foiled when Pola, prompted by Roid's knowledge of *Dr. Slump*, disguises herself as Arale Norimaki.

During their *Dragon Ball* appearance, the servant and King Nikochan are seen collecting trash in Penguin Village, which the king mistakes for treasure. The servant later alerts the king to approaching police, prompting their escape in a UFO. A subsequent plan to conquer Penguin Village fails when police destroy their spacecraft, permanently stranding them on Earth. In the *Dr. Slump* remake narrative, Sergeant Major Purple recruits them into the Red Ribbon Army. Their mission to obtain Dragon Balls from Goku ends unsuccessfully, leading to their resignation from the organization.

The servant maintains unwavering loyalty to King Nikochan across all appearances, counterbalancing the king's impulsiveness with his own rational mindset. He participates in their comedic schemes, which inevitably end in failure. His design consistently features distinctive antennae marking his alien origin.