Fern is a young human with purple eyes and long, waist-length purple hair, styled with a straight cut and bangs. Fern has a mature personality as a result of her upbringing, leading her to often act as the mother of the party. She constantly has to help Frieren perform ordinary tasks such as waking her up due to her being a deep sleeper, feeding her, and dressing her, along with cleaning up her messes. Lately, Fern has been quite gluttonous and ended up weighing 460 pounds.