Commander Kernagul serves as one of three chief officers under antagonist NeoNeros within the covert Dokuga organization in the original television narrative. This blue-skinned synthetic human harbors ambitions beyond villainy, specifically aspiring to launch fast-food franchises titled "Kernagul's Fried Chicken" and "KerDonald's." His personality merges aggression with comedic flair, frequently directing outbursts at his robotic companion Kerna—a source of comic relief. A crow perches on his shoulder, mirroring his volatile moods.

After the television series, Kernagul defects from Dokuga alongside officers Leonardo Medici Bundle and Suegni Cuttnal, aligning with the protagonists. This shift arises organically from mutual respect forged in prior conflicts. Decades later, during the sequel film, he successfully operates his envisioned fast-food empires.

When former comrade Remy Shimada suffers life-threatening injuries, Kernagul rejoins the team to secure her critical medical care. In Remy’s comatose dream sequences, he manifests at his original youthful age alongside similarly rejuvenated teammates. They navigate a hostile city where residents receive death predictions, and his presence signifies Remy’s enduring trust in their past alliance. During these dreams, Kernagul dons a penguin-logo track suit—distinct from others’ military attire—while retaining his characteristically imposing stature.