Code Geass: Lelouch of the Rebellion (コードギアス 反逆のルルーシュ, Kōdo Giasu: Hangyaku no Rurūshu) and its sequel series Code Geass: Lelouch of the Rebellion R2 (コードギアス 反逆のルルーシュR2, Kōdo Giasu Hangyaku no Rurūshu Āru Tsū) are Japanese anime made by Sunrise, directed by Gorō Taniguchi and written by Ichirō Ōkouchi. The series is focused around a former prince of the Holy Britannian Empire, Lelouch Vi Britannia, who obtains a mysterious power known as Geass and uses this power to destroy the Holy Britannian Empire, a superpower that controls one third of the world and has recently conquered Japan, and to discover the truth behind his mother's death, as well as the various people that he encounters as he heads toward those goals.

This is a list of characters, minor and major, appearing in both Code Geass: Lelouch of the Rebellion, its sequel series, and/or the core series' spin-offs and products. The fictional characters in Code Geass: Lelouch of the Rebellion were designed by the manga studio Clamp.

During early planning stages, director Gorō Taniguchi contacted the noted manga artist group Clamp, being the first time Clamp had ever been requested to design the characters of an anime series. Clamp signed onto the project early during these development stages and provided numerous ideas, which helped develop the series' setting and characters. Clamp's finalized original character design art, illustrated by its lead artist Mokona, was subsequently converted into animation character designs for the series by Sunrise's character designer Takahiro Kimura, who had previously spent "every day" analyzing Clamp's art and style from their art-books and manga series. In working on the animation character designs, he focused on designing them so as to enable the series' other animators to apply them without deviating from Clamp's original art style.

Lelouch Lamperouge (ルルーシュ・ランペルージ, Rurūshu Ranperūji) is the protagonist of Code Geass. Originally born as Lelouch vi Britannia (ルルーシュ・ヴィ・ブリタニア, Rurūshu vi Buritania), he is 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 towards 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, 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 orchestrate a revolution, 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.

Suzaku Kururugi (枢木スザク, Kururugi Suzaku) is Lelouch's childhood friend and son of Japan's last prime minister, Genbu Kururugi. He murdered his father when he was a child in the belief that it would end the war between Britannia and Japan, but only paved the way for Japan's conquering. Traumatized, he also begins to find a way to liberate Japan. However, in stark contrast to Lelouch, he claims to support reformism and that achieving results by wrong or illegal methods is meaningless, wanting to change Britannia from within. As such, he is aligned against Zero's Black Knights, but nevertheless intent on changing the Britannian Empire for the better. In reality, however, this is an illusion, as Suzaku actually wishes to be KIA in order to atone for his father's death. Suzaku is an Honorary Britannian and part of the Britannian army, later becoming the pilot of the experimental Knightmare Frame Lancelot as a member of the R&D Division. In the second season, Suzaku is granted a position in the Knights of the Round by the Emperor for his capture of Zero. At the same time, however, he becomes a repeatedly hypocritical anti villain, focusing on publicly exposing and killing Lelouch in an attempt to avenge the death of Euphemia, and is not above murdering and torturing others to get his way. Over the course of the second season, he slowly starts to see the error in his ways, and eventually becomes part of the Zero Requiem.

C.C. (シー・ツー, Shī Tsū; pronounced "C2") is the main female protagonist of the series. She is an immortal "witch" who bestows the power of Geass upon Lelouch under the condition he grants her greatest wish, later revealed to be for Lelouch, let alone anyone, to kill her. She oversees Lelouch's activities and assists in his plans in order to ensure that he remains alive to fulfill their contract. Lelouch often refers to her as the witch and himself as the "demon lord". She is seen to be quite close to Lelouch and advises him whenever he is feeling lost. C.C. often comes to get Lelouch out of a tough situation when his identity is about to be revealed. Despite this, she routinely gets on his nerves, often sneaking out without his permission or ordering Pizza Hut (which sponsors Code Geass in Japan) with his credit card.

Kallen Stadtfeld (カレン・シュタットフェルト, Karen Shutattoferuto) is a half-Britannian, half-Japanese teenage girl. Her father is Britannian and her mother is an Eleven; her father comes from a prestigious Britannian family, known as the Stadtfeld family, which Kallen benefits from. She attends the Ashford Academy, where she pretends to be a sickly, milquetoast student to explain her prolonged absences and changes in her appearance. She later becomes a member of its student council and one of the school's most outstanding students. In school, she is known by her legal name but she prefers her mother's maiden name and goes by the alias Kallen Kōuzuki (紅月カレン, Kōzuki Karen) during her revolutionary activities. Kallen is initially a member of a Japanese resistance cell led by Ohgi, using her brother's death as motivation, and later joins Zero's Black Knights. She is the group's most talented pilot and on par with the Knights of the Round. Throughout the series, her devotion to Zero is unmatched among any of the other members of the Black Knights, almost being Lelouch's female counterpart. Conversely, she dislikes Lelouch, despite constant remarks from others about intimacy in their relationship, and is dismayed when her Knightmare rival, Suzaku, reveals that Lelouch and Zero are the same people. However, when she learns more about Lelouch's noble desires via C.C. and Nunnally, she helps protect his identity and ultimately develops feelings for him.

Ashford Academy (アッシュフォード学園, Asshufōdo Gakuen) is a Britannian private academy in Tokyo, owned and operated by the Ashford Foundation (アッシュフォード財団, Asshufōdo Zaidan), a philanthropic organization involved predominantly in the supply of educational services, founded by the formerly noble Ashford House. It is attended by Lelouch and Nunnally, who, owing to their mother's past relationship with the Ashfords, have been granted free residence within the campus's Student Government Clubhouse. In the manga, it is implied that the academy itself was once Japanese owned and operated.