Nelliel is a female Arrancar who has hazel eyes and green hair. Her true form is that of a tall, fully-grown curvaceous and well-endowed adult with long waving green hair. Notably, she has a scar and the crimson line that runs across her face, and pronounced lower canine teeth. A large "3" is tattooed on her back, indicating that she was the former 3rd Espada. Nelliel is mature, composed, logical, sophisticated, and intelligent.