Lelouch Vi Britannia.

Geass allows one to issue absolute commands to anyone through direct eye contact. The target is obligated to obey the command, even if it contradicts their instinct for self-preservation. The Geass mark is located in the left eye (and, toward the end, in both eyes).
Strategic Genius - Lelouch is an exceptional tactician, defeating superior enemy forces through deception, psychological manipulation, and precise calculations.
Piloting Skills - Lelouch is proficient in the use of mechs, whether they be the Knights of the Bretan army or his own special line of mechs that he uses for the "Black Knights".
Important: Geass works only once on one person, all subsequent attempts will be ineffective.

Lelouch is a highly intelligent man, calm, refined, and arrogant, thanks to his aristocratic upbringing. At school, he presents himself as a sociable, pleasant, and often frivolous student, but in reality, this is a mask concealing his true nature.
In battle, Lelouch is very cold and tactful, willing to sacrifice both civilians and soldiers if necessary to achieve his goal.
He cares about his sister Nunnally - she is his only meaning in life, and he wants to build a world for her sake.
However, Lelouch's path to freedom is strewn with moral compromises and sacrifices—he uses Geass to achieve his goals, often manipulating and hurting innocent people. The power of Geass has a profound effect on Lelouch, gradually warping his personality—he becomes more cruel and ruthless, willing to sacrifice everything to achieve his goals.

Nunnally vi Britannia. Lelouch loves his sister and wants to create a world where she can live peacefully. Nunnally's safety and comfort have always been Lelouch's priority.
Suzaku Kurrugi. Lelouch's childhood friend, with whom his relationship is built on friendship, pain, mutual misunderstanding, and duty. Lelouch trusts Suzaku with everything, including the final stage of the "Zero Requiem" and Nunnally.
CC (C-C). CC's relationship with Lelouch is a delicate blend of partnership, trust, sarcasm, and mutual dependence. CC often serves as Lelouch's moral mirror, prompting him to reflect on the price of power and free will.
Kallen Kozuki. Kallen's bond with Lelouch develops gradually, traversing a spectrum of doubt, admiration, and deep respect. Kallen becomes Lelouch's most important supporter and one of the people who best understands his motivations.
Shirley Fennett. A kind, sensitive girl who is truly in love with Lelouch. She strives to understand him, even without knowing his secret side.
Cornelia Li Britannia. One of the Empire's most powerful princesses and an outstanding military leader. She is known for her sternness, determination, and loyalty to the Empire. However, her fierce determination conceals a deep love for her younger sister, Euphemia, whom she strives to protect at any cost.

Black hair. Lelouch inherited it from his mother.
Purple eyes. He also inherited this eye color from his mother. His left eye brightens when his Geass power is activated, transforming into the symbol of a flying bird.
Thinness. Lelouch has little muscle mass and is quite thin.
Tall. Despite his thin frame, Lelouch is significantly taller than many characters, for example, he's at least a head taller than Kallen, and according to some sources, slightly taller than Suzaku. His height is 178 centimeters.
Pale skin. Some descriptions mention Lelouch's skin as being "white-transparent."
Cloth:
At school, Lelouch wears the Ashford Academy uniform.
Outside the academy, his everyday attire is a red jacket, a black turtleneck, and gray pants.

She is the younger sister of the protagonist, Lelouch vi Britannia. Personality: Nunnally is a kind, patient, and understanding girl. She has endured her limitations with a smile and warmth. At the same time, she can make difficult decisions that border on ruthlessness. Abilities: Nunnally has a natural ability to determine whether someone is lying by touching their hand. In some cases, she was able to decipher her brother's plans by touching his hand.
Appearance:
Hair. She inherited her father's curly light brown hair, which reaches her hips.
Eyes. Violet, like mother's.
Smile. Nunnally can almost always be seen with a slight smile on her face.
Height. 160 centimeters.
Nunnally can often be seen wearing the Ashford Academy High School uniform.

Nicknames: "Zero Knight", "Angel Knight", "White Death".
The son of Japan's last prime minister, Genbu Kururugi, his existence was kept secret from the public until after the war.
He met Lelouch vi Britannia and his sister Nunnally vi Britannia when they moved into the Kururugi residence as part of a diplomatic peace deal. At first, Suzaku despised Lelouch, but over time, they became best friends.
At the age of 10, he killed his father, the Prime Minister of Japan, to end the war against Britain. But to atone for his guilt, he wants to change Britain from within.
He began serving in the British infantry. He then assumed the rank of Knight of Britannia and personal knight of Euphemia, appointed by Cornelia. He later became a Knight of the Round—an elite rank subordinate to the Emperor himself.
Before the British invasion of Japan, Suzaku was a bit selfish, rarely putting others before himself.
After the conquest of Japan and the murder of his father, Suzaku's personality underwent a radical change. He dedicated himself entirely to fighting terrorism and senseless killings.
Possesses a strong sense of loyalty, never questioning the orders of his superiors.
Pilot of the prototype of the new generation of Knightmares - "Lancelot".
In love with the British princess Euphemia Li Britannia.
Suzaku Kururugi is a young man with light brown hair and forest green eyes.
The character is quite tall, slightly shorter than Lelouch, and thin, which belies his extreme physical strength.