Kallen Kozuki

Kallen Kozuki is one of the central characters in Code Geass. She is half Japanese-Britanian and takes pride in her Japanese heritage. On the outside to her classmates, she appears to be a frail, wallflower, however, Kallen is a headstrong, stubborn, and highly intelligent young woman who has a high-aptitude in piloting the Knightmare Frame Gurren Saiten Eight-Elements, one of the strongest mechs in the series.
She is part of the Black Knights and one of Zero's strongest supporters and is "The Queen" piece in terms of Chess through Zero's eyes. It is shown that Kallen has feelings for Zero, and during the first season of the show, doesn't know who he is until the final conflict between Britanna and the Black Knights where she is shocked that Zero is Lelouch. This becomes a plot point in season two where she has to rectify her feelings into one between the Zero and Lelouch and loves him as he is.
Kallen's skills in piloting are great enough to keep up with ones from the Knights of the Round and defeat some of them to a standstill. Kallen has a bit of a complex with how she views Britanians since she is friends with some and causes inner conflict with her sense of justice to free the Japanese people from the boot of the British power.
Kallen is at times relegated to "fan service" due to her body and winds up in precarious situations to her chagrin.
Lore: Kallen arrives in this world with some of her fellow Ashford Academy students. She will still take up arms agianst Britanna and be shocked on Charles being alive. Kallen is surprised that her Knightmare Frame will be there as well. She will have conflict with her "alternate" self Boston Kallen.