Lelouch's trademarks are his ebony hair, and violet eyes, which he inherited from his mother, and father respectively. Lelouch is somewhat scrawny, having little muscle, and being 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, likeable, and often easy going student. However, in reality, this is 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.
Lelouch is known for having a very stoic personality. He never cared about schoolwork, seeing the entire thing as trivial, even though his intellect would make it easy for him. He enjoys seeking out challenges, often playing chess against nobility. In general, Lelouch takes most day-to-day affairs with open disinterest, often not even noticing the affection of others, especially Shirley, his fellow shinobi.
In battle, Lelouch is very cold and tactical, he is willing to sacrifice anyone, civilians and military alike, if that is what it takes to achieve the objective. During a landslide, he wiped out many of the enemy forces, and indirectly, several civilian casualties. Lelouch put it off as a simple "mathematical overestimation."Despite his coldness and ruthlessness in battle, he can be a rather compassionate person to his friends and loved ones,at first glance, seems to have relatively little concern for the well-being of his subordinates, but in reality, he does care about them, seeing them as valuable allies.