Riku is a high school student with a knack for gambling high on chess games and I.Q. that well exceeded being a genius along with a hatred for all things higher in rank or social class than him. He is generally caring, yet lazy, but has a dark desire to destroy anything and everything that pollutes the world with lies and anarchy, ultimately wanting global dominance and peace proceeding. When he is accidently trapped along with some terrorists and then confronted by the Britannian military as being an involved, at which point a girl with green hair blocks a coming bullet to prevent Riku from taking it. She's declared dead, but moves after the shock, bleeding from the head, and grabs Riku's hand, announcing a contract that will allow him to live. She collapses and Riku opens his eyes to reveal a bird shaped, pink and crimson iris that releases an ability of absolute obedience. He announces his real name in a command and orders the guards to commit suicide which they do with glee. Afterwhich Riku uses his keen intellect to lead the terrorists in their fight, but it ends in a draw when Kairi appears in a new knightmare, which is the primary weapon in the show, a semi-human mecha-robot. Riku retreats, returning to Ashford Academy, where the girl who reveals herself to be Namine meets up with him, and apparently stays the night, claiming that their contract requires her to keep close to the current user of Geass. Riku becomes "Zero" a C.E.O. figure for the "Black Knights" the recently organized terrorist group, which he intends to use to take back Japan, and following that, the world. After a series of victories, during the final battle for Japan Riku retreats to help his brother, resulting in the loss of the battle. Kairi having captured Riku gives him to the emperor where it is revealed that he too has a geass, his with the power to alter a persons memory; Which he uses to erase Riku's memory of being a prince, of his brother, and of being Zero.