Sistine Fibel  

Shironeko, Sisti, システィーナ=フィーベル

Sistine is passionate about magic, particularly air magic, and dreams of discovering the secret behind the Flying Castle, which no one else knows. She has long silver hair and olive-green eyes, often wears her school uniform, and is friends with Rumia, who was adopted by the Fibel family. Sistine maintains a strict personality and scolds Glenn Radars for his careless attitude. Initially, she dislikes Glenn due to his unenthusiastic demeanor, but comes to appreciate him as a good teacher. As a child, Sistine made a promise to her grandfather to solve the mysteries of the Sky Castle after his death, which fueled her desire for learning and honing her magic skills to achieve that goal.