Gulf Zoneboyle serves as a prominent antagonist within the anime Comet Lucifer. He holds the powerful position of chief executive in the administrative government, a role that grants him significant authority over the planet known as Gift. His background is rooted in the trade of military materials, an enterprise through which he originally amassed his wealth and influence, eventually rising to become one of the most powerful officials in the government.

Physically, Gulf Zoneboyle is depicted as an older man with gray hair and black eyes. He is seen using a wheelchair, is typically bearded, and wears gloves. His personality is marked by a striking contradiction. While he is driven by an immense ambition and is willing to employ ruthless, even violent, methods to achieve his objectives, he is fundamentally an idealist at heart. This idealistic side fuels his primary motivation: to find the legendary ore known as Lucifer. He believes this powerful mineral possesses the ability to make the planet Gift more prosperous and beautiful. His ultimate goal is to use this power to create a new world without the social ills that plague his society, specifically one devoid of wealth disparity and class divisions.

Within the story's narrative, Gulf Zoneboyle plays a central role as an instigator of conflict, acting as a primary antagonist. His actions are directly tied to the main plot, as he orchestrates a search for the Lucifer ore. In the past, he had supported research into a different source of energy, a red ore, but that project ended in failure following the death of the researcher, Kaon. His desperation to achieve his vision drives him to extreme measures. Ultimately, his goal requires him to oppose the main characters, and he resolves to commit terrible acts, including attempting to kill the character Felia, to fulfill his plans.

Key relationships define his trajectory. He receives assistance from Lily Anatoria in his quest for the Lucifer ore. However, this alliance is treacherous, as Lily is ultimately manipulating him for her own ends. Gulf Zoneboyle suffers from a critical flaw: he fails to see the truth of the situations around him, instead perceiving only what he wishes to see. This blindness leads directly to his downfall, as he is eventually killed by Lily, who had been using him all along. His development is therefore a tragic one, tracing the path of a powerful and once-ambitious leader whose idealism curdles into destructive obsession, making him a tool for others before he is ultimately discarded. No notable or supernatural abilities outside of his political power and resources are highlighted.