Production

Production and design

Code Geass began as a concept developed at Sunrise by Ichirō Ōkouchi and Gorō Taniguchi, who proposed it to producer Yoshitaka Kawaguchi. Kawaguchi had previously approached Okouchi and Taniguchi during the production of Planetes.

The basic idea for the plot consisted of a "hero" who led a secret organization, which was later developed into a conflict between two characters with different values and who belonged to the same military unit.

During these initial planning stages, Kawaguchi also contacted the noted manga artist group Clamp.This was 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.

While developing the character designs for Lelouch Lamperouge, the protagonist of the series, Clamp had originally conceived of his hair color as being white. Ageha Ohkawa, head writer at Clamp, said she had visualized him as being a character to which "everyone" could relate to as being "cool", literally, a "beauty". During these planning stages, Clamp and the Sunrise staff had discussed a number of possible inspirations for the characters, including KinKi Kids and Tackey & Tsubasa. They had wanted to create a "hit show," a series which would appeal to "everyone."

 Lelouch's alter ego, Zero, was one of the earliest developed characters, with Ōkouchi having wanted a mask to be included as a part of the series, feeling it was necessary for it to be a Sunrise show, and Clamp wanting a unique design never prior seen in any Sunrise series (said mask was nicknamed "tulip" for its distinctive design).

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 artbooks 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.

The music for the series was composed by Kōtarō Nakagawa and Hitomi Kuroishi, who had earlier worked with the series' core staff inPlanetes and Taniguchi's earlier work Gun X Sword. In addition to the incidental music featured in each episode, Kuroishi also composed numerous insert songs for the series, including "Stories", "Masquerade", "Alone", and "Innocent Days", which were each performed by Kuroishi herself, while "Picaresque" and "Callin'" were performed by the singer-songwriter Mikio Sakai, who had also earlier worked with Nakagawa and Kuroishi in Planetes. The bands FLOW, Ali Project, Jinn, SunSet Swish, Access, and Orange Range have provided songs for the opening and ending themes.

When the series was being developed for broadcast on Mainichi Broadcasting System, it had been given the network's Saturday evening prime time slot, which was later changed to a Thursday late night time slot. Due to this change, the overall outlook and some elements of the series were changed and further developed to suit the more mature, late night audience. The supernatural "Geass" ability finally came into the show at this point and was first conceived as a special power granted by an "angel" to the main characters, though this last part was also modified