Amelia Rosequartz, an elf of royal lineage, was forced into exile after being betrayed and trapped by her younger sister Kilika. She sought refuge deep within an unexplored monster-infested labyrinth, where she was eventually discovered and rescued by Akira Oda. Following this encounter, she becomes his companion.

She possesses distinct elven features, including long silver hair that falls past her waist, with parted bangs framing her face, and striking magenta eyes. Her long, pointed ears mark her heritage. She wears a golden headband adorned with blue gemstones on both sides. Her attire consists of a high-necked bodice with black and silver panels featuring gold trim, a short black ruffled skirt, and a blue-and-gold cloak draping behind her. She wears thigh-high black stockings with golden accents, silver and gold heeled boots, and accessorizes with blue gemstones at her waist and wrists.

She generally maintains a calm, cold, and silent demeanor, often appearing expressionless. However, after being saved by Akira, she displays a broader range of emotions specifically in his presence. She also possesses a gluttonous nature.

As a silver-rank adventurer, she demonstrates high combat abilities. Her status parameters include 25,000 HP, 400 attack power, 350 defense, and maximum MP listed as OVER MAX. Her advanced skills include Royal Grace Lv.4, Spellcraft Lv.4, Resurrection Magic, Curseproof, and Evasion Magic. Additional skills comprise Archery Lv.8, Spirit Dance, and World Eyes Lv.3. These abilities collectively qualify as a cheat skill that surpasses that of a hero.