Zombie-kun serves as the protagonist, portrayed as a child zombie with unconventional bodily properties enabling comedic scenarios. His physical form defies human biology through actions like detaching limbs or organs and reassembling them using adhesive. Specific instances include inflating his removed stomach as a pillow, wringing moisture from detached limbs before reattachment, repurposing intestines as a jump rope, and peeling skin to function as a coat. These antics maintain a cartoonish, non-graphic tone appropriate for young viewers.

He shares a close bond with a human companion named Isamu. Their joint activities aim for positive outcomes but frequently trigger unintended mishaps due to Zombie-kun's undead physiology, often causing his body to fragment. Their interactions center on resolving these physical complications collaboratively.

An antagonist called Snot Zombie opposes him, while Zombie Rich Girl acts as a love interest. His stories prioritize lighthearted adventures and absurdist humor derived from his unique physical traits, deliberately avoiding horror themes. The narrative contains no details regarding his origins, background, or character development.

The character consistently focuses on visual gags and episodic situations involving bodily disassembly and reassembly. Relationships remain static, emphasizing friendship and comedic conflict without documented evolution in available materials.