Rozé is the protagonist of "Code Geass: Rozé of the Recapture" and is the younger brother of Ash.
It is revealed at the end of episode 1 that Rozé is in fact a disguise used by Sakuya Sumeragi and that she also used the geass on her supposed brother Ash to make him acknowledge her as his brother. It is revealed in episode 3 that who gave her the power of the geass was actually Lelouch Vi Britannia the 99th Emperor of the Holy Britannian Empire who was turned into a code L.L in the final of the movie "Code Geass Lelouch of The Ressurection".