ユーフェミア・リ・ブリタニア

Euphemia li Britannia is Lelouch's half-sister and the Third Princess of the Holy Britannian Empire. She is a kindhearted and open-minded girl who despises conflict in any form. She is also a very optimistic person unlike many of her siblings. Unlike her brother Lelouch, she is a pacifist and in many ways Suzaku's female counterpart; however, she is also the closest sibling to Lelouch and Nunnally. Euphemia joins her older sister Cornelia in governing Area 11, becoming the Sub-Viceroy. In the process, she meets Suzaku and begins a relationship with him after he becomes her Knight, or bodyguard. Toward the end of the first season, she deduces Lelouch's identity but after getting marooned with him for two days also ends up discovering his plans for change. Wanting to help Zero and instill trust in him for the civilian populace, she announces her intent to form the Special Administrative Zone of Japan in the region under Mount Fuji, giving the Japanese people their name and country back, and govern it alongside Zero. During the administration changeover ceremony, she falls under the accidental influence of Lelouch's Geass, and is reluctantly compelled to kill the Japanese people. She is fatally shot in the stomach by Zero to end the chaos and dies from her injuries unaware of what has happened, sparking the Black Rebellion and provoking Suzaku to desire to kill Zero, who himself is grieving over what he had to do. Britannia officially declares Euphemia responsible for the massacre, and she comes to be known as the "Massacre Princess" (虐殺皇女 Gyakusatsu Kōjo) to the general public. Once Lelouch becomes Emperor, he intends to shed enough blood to make the name of Princess Massacre be forgotten, allowing his culpability for the event to become exposed in order to direct the hatred of the entire world upon himself./

From url=https://en.wikipedia.org/wiki/List_of_Code_Geass_characters#Holy_Britannian_Empire.