Radamanthys stands among the Three Judges of the Underworld within Hades' army, bearing the title of Wyvern Radamanthys under the Celestial Fierce Star. He possesses a height of 189 cm, blonde hair, prominent unified eyebrows, and a consistently stern expression. Commanding the Caina section of the Underworld, he leads a division of Specters. His personality is marked by ruthlessness, arrogance, and pragmatism. He prioritizes victory through strength and emotional detachment, readily disregarding orders from Pandora, Hades' lieutenant, if he deems it strategically necessary. This is demonstrated when he sends Specters to invade Athena's Sanctuary without authorization, distrusting revived Gold Saints. Confident in his combat prowess, he dismisses opponents perceived as weak but acknowledges formidable foes like Gemini Kanon. His background varies: the primary timeline places his origin in the Faroe Islands, while the spin-off *The Lost Canvas* identifies the United Kingdom as his birthplace and notes a familial link to Ketos Chris as cousins. Details regarding his training or early service remain undisclosed. His combat capabilities center on his signature technique, "Greatest Caution," channeling cosmic energy into concussive wind blasts or a manifested wyvern entity. This technique overpowers multiple adversaries, including Gold Saints. Notable battles include effortlessly defeating Cancer Deathmask and Pisces Aphrodite simultaneously after their betrayal, and overwhelming Leo Aiolia, Scorpio Milo, and Aries Mu within Hades' power-reducing barrier. His resilience allows him to survive extended conflicts, though he sustains injuries against opponents like Kanon. Key narrative arcs include: * **Sanctuary Invasion**: Disobeying Pandora, he deploys Specters to assassinate Athena, resulting in their defeat. Punished by Pandora, he retains his Judge rank. * **Underworld Confrontations**: During the Inferno chapter, he battles Bronze Saints and Athena's allies. After transporting Pegasus Seiya to Cocytus, he engages Gemini Kanon in the Fifth Prison. Their fight concludes at the Wailing Wall, where Kanon sacrifices himself to destroy the barrier, taking Radamanthys with him in a fatal clash. * **The Lost Canvas Spin-off**: Here, he kills Leo Ilias and battles Scorpio Kardia, surviving the Scarlet Needle technique due to infused divine blood. Temporarily empowered, he later attacks Hades' vessel Alone upon recognizing his inauthenticity, but is killed by Regulus (Ilias' son), who extracts his heart. His role concludes with his demise in both continuities: during the Wailing Wall sequence in the primary timeline and against Regulus in *The Lost Canvas*.