Tuuli has blue eyes and naturally wavy blueish-green hair, which she usually wears tied back in a braid. On formal occasions, like her baptism, she wears her hair loose. She resembles her mother Effa, who is well-known for being a beauty.

Tuuli is practical, caring, and responsible young 7yo; her sister Myne frequently calls her an "angel" due to her sweet demeanor. Growing up, others in their neighborhood trust her to look after younger children when they make trips into the nearby forest.