Arle Nadja is the main protagonist of the first Puyo Puyo game, originally making her debut in Madou Monogatari. She continued as the protagonist until the fourth game, whereupon Amitie took her place.
Arle is typically depicted in a colour scheme of white and blue, which feature heavily throughout her outfit, which consist of a shirt, skirt and boots. In addition to her clothing, she also wears blue and white wristbands, and a turquoise breastplate across her torso.
In terms of her physical appearance, Arle's hair is styled in a brown ponytail; she also has fair skin and yellow eyes.
Arle can be a bit tomboyish, despite her physical appearance involving a skirt sometimes. She does, however, use Bokkuko speech patterns that are often used by Japanese tomboys.