Shun Canaan Preases, a young man from Agartha—a hidden underground realm—sports shoulder-length brown hair, green eyes, and a simple attire of white shirt and black pants. A blue crystal pendant, mirroring the one used by Asuna Watase for her radio, hangs from his neck, anchoring his tie to Agartha’s enigmas. Raised alongside his twin brother, Shin, Shun endured early tragedy with their parents’ deaths. Villagers rescued and trained the brothers to battle threats like monsters, forging combat prowess and resilience. But an incurable disease later eroded Shun’s health, suffusing his calm exterior with quiet melancholy as he confronted mortality. His defining act emerges when he saves Asuna from a Quetzalcoatl, blending battlefield confidence with post-fight fragility. After shielding her from authorities and carrying her to safety, tears betray his awareness of death’s approach. He shares tales of Agartha, gifts a forehead kiss as both blessing and farewell, then meets his end falling from a cliff beneath starlight—a terminal illness and the clavis crystal’s glow framing his acceptance of fate. Though fleeting in life, Shun’s influence lingers. His bond with Asuna propels her toward Agartha, while his death fractures Shin’s aloof facade, exposing buried grief. Transmitted through a dying Quetzalcoatl, his final song bridges living and dead, etching his role as a guide threading mortality, memory, and realms beyond. The brothers’ shared past—orphaned, trained, village-raised—highlights parallels, yet Shun’s warmth contrasts Shin’s guardedness. Shun’s brief surface-world venture reveals curiosity and a drive to connect, though Agarthan physiology falters in foreign air. Hidden beneath resolve, his physical decay and emotional burdens carve him as a tragic figure, his legacy enduring long after silence.