Lelouch Lamperouge is the protagonist of the anime Code Geass, but in the game Lost Colors he also plays a major role.
<hidden by spoiler settings>He is originally born as Lelouch vi Britannia (ルルーシュ・ヴィ・ブリタニア), 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. For questioning his father's cold apathy of his mother's assassination and his sister Nunnally's disablement, Lelouch and Nunnally were sent to Japan as political hostages. Taken into the residence of the Prime Minister of Japan, Lelouch and Nunnally soon formed a strong friendship with the Prime Minister's son, Suzaku Kururugi.
When Britannia invaded Japan, he went into hiding with his sister Nunnaly, taking refuge with the Ashford family. Seven years later, he discovers C.C., who grants him a Geass that allows him to command any person to follow his subsequent order. Seeking to build a peaceful world for his sister even though all she wants is to be with him, he begins to support revolutionary socialism despite it being his father's exact beliefs, pursuing the destruction of Britannia under the guise of his masked alter-ego, Zero. As Zero, he creates a military force known as the Black Knights, formed from the members of a group originally known as the Japanese Resistance.