Frog Zelos serves as one of Hades' 108 Specters under the Terrestrial Strangeness Star, clad in a Frog Surplice evoking a crawling amphibian with folklore ties to witchcraft and poison. In *The Lost Canvas*, he joins Pandora's mission to assassinate Pegasus Tenma alongside Dullahan Cube and Bat Wimber. After Taurus Aldebaran defeats his comrades with Titan's Nova, Zelos survives by hiding underground. He emerges to desecrate Aldebaran's corpse, boasting of his undetected presence. Bennu Kagaho subdues him with black flames, forcing him to reveal Pandora's role. Later, Zelos speculates with Cait Sith Cheshire about the current Hades's authenticity, given Pandora's unilateral command. Captured in the Scorpio Temple, Scorpio Kardia tortures him for the route to Hades' Lost Canvas. Zelos claims ignorance and is abandoned when the Saints depart. During the Hades Arc, he operates under Wyvern Rhadamanthys, dispatching terrestrial Specters like Papillon Myu to monitor revived Gold Saints in Athena's Sanctuary, though he questions this without Pandora's approval. He observes Rhadamanthys receiving punishment from Pandora for mission failure with visible satisfaction. When Gemini Saga, Capricorn Shura, and Aquarius Camus return with Athena's empty shroud, Zelos aggressively confronts them, attempting to unveil the cloth. Camus repels him with ice. After Pandora departs for the Underworld, Zelos vengefully assaults the immobilized Camus. The arrival of the Bronze Saints interrupts him; Cygnus Hyoga intervenes. Zelos persists in attacking Camus, prompting Hyoga to freeze him with Diamond Dust and kill him with Aurora Execution. Zelos displays sycophantic loyalty to Pandora, frequently questioning actions that might displease her. He openly resents Rhadamanthys for disregarding her authority yet still follows his orders. His personality blends cowardice with arrogance; he mocks defeated allies and desecrates corpses but cowers before stronger opponents like Kagaho. Despite his role, he fears death and begs for mercy during torture. Thematically, his defeat by Hyoga, the Swan Saint, references Aesop's fable "The Frogs and the Sun" and an Asian proverb about a frog coveting a swan's flesh, framing their battle as a moral lesson against wickedness. His combat abilities involve physical strikes. He survives powerful attacks through stealth rather than durability, favoring opportunism like ambushing incapacitated foes.