Benio Akagi

Benio Akagi (赤城ベニオ, Akagi Benio) is a young girl who joined the Black Knights following their reformation after Zero returned. She, along with her family, attended the ceremony for the Special Administrative Zone of Japan, where her parents died in the chaos, and she was saved by Kallen Kōzuki.

Code Geass: Lancelot & Guren
Benio makes her first appearance attending the opening of the Special Administrative Zone of Japan with her parents, having gotten lucky enough to get tickets to enter the stadium's main area. Her parents and Benio thinks that she can't remember the last time that her parents have been this happy, however, their joy is short-lived, as Princess Euphemia returns from her meeting with Zero, and asks all of the Japanese to die. Initially confused by her words, the crowd panics after she shoots a man, and the Britannian soldiers follow her lead. Managing to escape the chaos in the stadium, her father proclaims that the Black Knights will save them and to just run while her mother tells her to be brave. Unfortunately, in that moment tragedy strikes and Benio is knocked to the ground by an explosion, and her parents have been crushed by debris, leaving only a large splatter of blood where they had been. Stunned by the death of her parents, just as a Sutherland is about to kill her too, she is saved by the Guren Mk-II. Without time to process what is going on or a chance yet to feel sadness, the color crimson-the color of the stain on the ground left by her parents, and the color of the Knightmare that saved her life-is imprinted in her mind.

Kallen Kozuki
Benio looks up to Kallen, who sees her as a sort of younger sister.