A diablo prodigy. She was born in Belgium and raised in France. Rosetta has been doing diablo since she was very young, and won her first tournament at age nine. She earned the nickname "The Diablo Machine" due to her flawless performances yet cold demeanor. After she comes to Kaleido Stage, Sora helps bring back her smile and change her outlook on life. The two girls become very close, with Rosetta looking up to Sora as an older sister figure.

Spoiler

At the end of the show, Rosetta gains the ability to see Fool, meaning that she is the next person chosen for the stage.