Felzeb manifests as a diminutive, fairy-like entity permanently connected to Belzeb, residing within his chest cavity and emerging when needed. Her core function involves collaborating with Belzeb to empower standard Jaku Beasts into powerful Super Jaku Beasts, a process initiated after the Jaaku Empire leadership secured Jaku Satan. This power-bestowing duty remains a constant operational requirement throughout the conflict against the Earth Defense Class.

Her existence is symbiotic with Belzeb, forming an integral component of his combat capabilities; she functions as a living power source embedded within him. Their dynamic relies on mutual dependence for effectiveness in battles against Raijin-Oh and its upgraded forms.

One distinct narrative arc reveals aspects of Felzeb beyond her functional role. Dispatched on reconnaissance to locate the Raijin-Oh base, she becomes separated and lost within a human town. Seeking refuge, she inadvertently hides within Jin Hyuga's hair. Her unseen manipulations lead Jin to mistakenly believe he has developed psychic abilities. This episode demonstrates her capacity for independent action outside direct supervision and underscores her vulnerability when isolated from Belzeb.

Felzeb consistently maintains her established role within the Jaaku Empire hierarchy for the duration of the conflict, supporting Belzeb and Taida in their campaigns against Earth's defenders. Her narrative concludes with the retreat of the Jaaku Empire forces following their ultimate defeat, with no canonical developments documented in subsequent media like the four-episode OVA sequel.