Lelouch is a handsome young man with black hair and violet eyes, which he inherited from his mother. Lelouch is somewhat scrawny, having little muscle, and like most characters in the series, is rather thin. In spite of this, Lelouch is considerably tall, standing at least a head taller than Kallen, and apparently being slightly taller than Suzaku. Lelouch is a highly intelligent individual who is also calm, sophisticated, and arrogant due to his aristocratic upbringing. While at school, Lelouch conducts himself as a sociable, likable, and often easygoing student. However, this is really a mask to hide his true nature. While as Zero his true nature is expressed. His charisma and beliefs in justice gain him the trust and respect of many soldiers and leaders.

C.C. is a slender, fair skinned girl with long, almost waist-length light green hair and golden eyes. She is of average height, being slightly shorter than Kallen. She has a scar under her left breast that resembles a Geass sigil. She's quickly shown to be stubborn, selfish, and headstrong, as well as possessing high standards, which Lelouch takes note of and teases her about from time to time. Ironically, she claims to hate stubbornness, despite being quite stubborn herself. Though, it appears she notes these qualities to be essential to her sense of self, saying "That is what makes me C.C." in reference to them. She's shown to be pragmatic, focused on fulfilling her "contract" with Lelouch, which also serves to show her selfish side.