Real Name: Karen
Real Surname: Kozuki
Birthday: March 29, 2000 a.t.B.
Zodiacal Sign: Aries
Knightmare Frame: Guren
Seiyuu: Koshimizu Ami
At the begin of the series, we see her at the Babel Tower as infiltrated because she was trying to get back Lelouch. She's still one of the strongest member of the Kuro no Kishidan.
It's clear that her feelings for Lelouch are near to love, even if she found out his true identity and tries to don't admit it. After a battle against the Knight of Rounds, she will gain new parts for her Knightmare Frame, that becomes the Guren Kashoushiki.