Fern is a mature, highly disciplined human mage who stands around 160–167 cm (5'3"–5'6") tall and is 20 years old She acts like a caretaker for her group, waking up Frieren, managing schedules, and making sure everyone eats. She rarely shows strong emotions and keeps a calm, expressionless face because she had to grow up fast during wartime. She can be pouty, easily jealous, or sulk when she feels ignored or when she doesn't get her favorite treats.