Tuuli has blue-green hair, a mix of her mother Eva's green and her father Gunther's blue. After Myne wakes up, she has it tied up in a dirty braid. In the light novel and anime, Tuuli's bangs are shown to be centered, but in the manga, they are brushed to the right. She has blue eyes. For her baptism, Tuuli's hair was cleaned and tied half-up. Tuuli is much cleaner than her age cohort due to Myne's insistence on frequent washing and use of shampoo.