Hilda is a tall, slender girl with long dark brown hair and blue eyes. Her top hair is covered by her hat, this being why it's unknown what her hairstyle is. In the Adventures Manga, her counterpart, White, was shown without her hat once.
Hilda wears a white tank shirt that reaches her waist underneath a black waistcoat and a pair of denim shorts with white tear details on them. She also wears black wristbands with a small pink stripe on them with matching black ankle boots, pink laces and soles, and a pair of black socks underneath. Hilda also carries a pink messenger bag around.