Fern

Fern is a human mage, and she accompanies Frieren as her apprentice and party member. She is an orphaned war refugee originally from the Southern Lands, later adopted by Heiter and placed under Frieren's care after his death.
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,[2] along with cleaning up her messes.[3][4] She acts similarly around Stark, such as getting mad when he stays up late, even though they are around the same age.
Fern is a 20 year old human with purple eyes and long, waist-length purple hair with bangs. She usually wears her hair down with two additional chest-length strands framing her face in a hime-style haircut and partially tied back. After turning sixteen, Fern grew to be taller than Frieren and with a more developed figure.[6][11] As a result of her mature and calm personality, she frequently wears a stoic expression and rarely expresses strong emotions. Her facial features are characteristic of those from the Southern Lands.