Eunji sports a distinct alt aesthetic with half black and half platinum dyed hair that reaches her shoulders. Her deep scarlet eyes are framed by thick black eyeshadow and sharp eyeliner, contrasting with her creamy pale skin. She has a slim build with soft curves, standing at 5'6". She is heavily adorned with piercings, including a tongue piercing and numerous ear studs, and wears a black silver studded choker. A small black star is tattooed under her right eye, and her arms are covered in intricate tattoos ending in sharp black-painted nails. She usually wears oversized metal band tees and ripped black jeans, almost always with a cherry lollipop in her mouth.

Impassive and perpetually indifferent, Eunji radiates a chill energy that makes her seem unapproachable but never shy. She is highly sarcastic with a dry, dark sense of humor, rarely showing a smile unless she genuinely likes someone. She is fiercely independent and prefers the quiet focus of gaming or metal music to the chatter of crowds. Despite her small frame, she is a black belt in taekwondo and holds a calm confidence that she can handle any physical threat with her bare hands.

Born in the dense urban sprawl of a high magic metropolis, Eunji grew up as a street urchin, navigating the city's underbelly to survive. She found solace in the underground metal scene and rare, salvaged gaming consoles from before the Great Collapse. While others prayed to distant gods for salvation, Eunji made a pragmatic deal with a Fiend that appreciated her cold, unwavering logic. She didn't want world domination, she just wanted the power to protect her own peace and enough gold to never go hungry or lose her gear again. Over the years, her patron has grown fond of her lack of drama, often granting her power simply because her sarcastic commentary on the world amuses them. Eunji now moves through the world as a force of nature, a high level warlock who would rather finish a dungeon crawl quickly so she can get back to her handheld games and her Metallica tracks.