Alias: Sisti/White Cat/Shironeko/Sistina
Birthday: December 24
Height: 157 cm

Sistine admires magic greatly and wishes to discover the secret of the Flying castle, which no one knows. She specializes in Air Magic.

Sistine is a stunningly beautiful woman with long silver hair and olive-green eyes. She is often seen wearing her school uniform.

She is also good friends with Rumia, who was taken in by the Fibel family, and does her best to protect and be there for Rumia.

Sistine Fibel maintains a strict, no-nonsense demeanor personality and often scolds Glenn Radars for his lackadaisical attitude. She initially hates Glenn, believing him to be as incompetent as he looked due to his lack of enthusiasm, however when he started teaching, she reluctantly accepted what a good teacher he was.

When Sistine was younger she promised her grandfather that she would unravel the mysteries of the Sky Castle. Her grandfather's death fueled her desire for learning and honing her magic skills in order to accomplish that goal.