Kaisa appears to be a young female adult. She wears a grey sweater vest, a white blouse, grey leggings, and a black skirt with a black cloak across her shoulders. Her hair is mostly black, but is purple towards the tips. Occasionally, she is seen wearing black/grey headphones attached to a sort of portable media player.
Personality
Kaisa is usually calm, but can be rather strict with rules. In "Chapter 8: The Tide Mice", she directly confronted Hilda when she discovered the library's secret chamber and got a bit stern. In "Chapter 3: The Witch" when Hilda and Frida found out about the Witches Tower, she felt a bit annoyed and embarrassed.
She has the uncanny ability to always know exactly what book people are looking for, even before they can ask her about it. Another quirky thing about her is that she has memorized the entire layout of St. Guglows Cemetery. This last thing she doesn't want to admit however.
She is later seen as having some insecurity about her abilities as a witch, believing she wasn't the witch she was trained to be. She clearly showed worry that her teacher would be disappointed with her, and that she was nothing more than a librarian rather than a proper witch. These beliefs are later dispelled with some help from Hilda and Frida, the latter of whom is even accepted as a student by her former mentor.
Because of her duties of being a witch and librarian, Kaisa may seem like an outcast who is private, soft-spoken and kept secret. However, she seems like a very calm and kind person who is content with most things, even if it means offering someone information, advice, or a task to handle and has a little sense of humor. As she opens up a bit more to Hilda and her friends, seen in "Chapter 11: The Jorts Incident", she humorously complements how delicious and addictive Jortsare and when assisting Hilda and the others to vacuum the tide mice, she seems to get a thrill out of things. She states after that she's never had so much fun in a while and compliments to David on their teamwork. David questioned her way of fun and replied that she doesn't get out much. This is likely due to the strict rules and insecurities she's was bound to being a witch that burdened her (like in the movie, when witches aren't allowed to get involved in troll affairs), which she finally is able to let go of.
