Lelouch Vi Britannia (ZERO)
Lelouch Lamperouge is the title character and protagonist of the series. He was born as Lelouch vi Britannia, the Eleventh Prince of the Britannian Imperial Family and seventeenth in line for the throne. His father is the Britannian Emperor, Charles zi Britannia, and his mother was Marianne vi Britannia. He was sent to Japan as a political hostage for questioning his father's cold regard for his mother's assassination and the crippling of his blind sister Nunnally. When Britannia invaded, he went into hiding with his sister, taking refuge with the Ashford family. Seven years later, he discovers an enigmatic girl known as C.C., who grants him an ability called Geass, which allows him to command others to behave as he wishes. Seeking to build a peaceful world for his sister, he pursues the destruction of Britannia under the guise of his masked alter-ego Zero.

Suzaku Kururugi
Suzaku Kururugi is Lelouch's childhood friend and son of Japan's last prime minister, Genbu Kururugi. He is both a secondary protagonist and antagonist of the series, aligned against Zero's Black Knights but nevertheless intent on changing the Britannian Empire for the better. He claims that achieving results by wrong or illegal methods is meaningless, wanting to change Britannia from within. Suzaku is an Honorary Britannian and part of the Britannian army, later becoming the pilot of the experimental Knightmare Frame Lancelot as a member of the R&D Division. He later falls in love with Princess Euphemia, who is murdered by Zero. In the second season, Suzaku is granted a position in the Knights of the Round by the Emperor for his capture of Zero. His title and rank is Knight of Seven. Suzaku desires to become the Knight of One, a status that will allow him to rule Area 11 by his choosing.

Nunnally Vi Britannia
Nunnally Lamperouge is Lelouch's younger sister. Injured in her mother Marianne's brutal assassination, she is wheelchair-bound and blind from psychological trauma. It is on her behalf that Lelouch pursues the destruction of Britannia and the forging of a peaceful world. Following her return to the Imperial Family in the second season, she retakes her birth name, Nunnally vi Britannia, and is at her own request appointed Viceroy of Area 11. also she whil find out that her injury whas caused by the Geass of her own father . to protect them from harm