Zephel, the Guardian of Steel, embodies the element of steel and traits of ingenuity alongside a notably rebellious personality. His responsibilities involve utilizing elemental powers to maintain cosmic balance under the queen's rule. In "Angelique: Seichi yori Ai o Komete", Zephel loses one of the sacred jewels entrusted to him during a queen-led mission to secure these artifacts, endangering the universe as the jewels threaten to empower malicious forces, compelling him to address the consequences.

Throughout the "Koi suru Tenshi Angelique" narrative, Zephel interacts closely with Ange, the Legendary Etoile. He rescues her from a fall and challenges her self-reliant tendencies, urging her to seek support. Zephel develops unrequited romantic feelings for Ange, culminating in a confession that surprises her, though their relationship remains unresolved by the series' conclusion.

His character evolves across anime seasons. Starting with a defiant and independent demeanor, Zephel gradually demonstrates increased dedication to his guardianship duties and a growing willingness to collaborate, particularly evident in his efforts to assist Ange in balancing Sacrea energies to save the Seijuu galaxy.