Editing Code Lyoko (section)

=== Writing ===
The writing process for ''Code Lyoko'' usually began with the head writer asking the other writers for story pitches.<ref name="i" /> If they liked an idea, it next had to receive approval from the show's director, producers and broadcasters before it could be turned into a 4-page synopsis. After going through the approval process again, it was then expanded into a script and approved one last time to be sent off for production. Writing an episode typically lasted 2–3 weeks, though some took longer if higher-ups were unhappy with the story or it ran into issues. Sophie Decroisette, head writer of Code Lyoko's first three seasons, described ''Image Problem'' as "very difficult to write" after its original writer left the show following the synopsis phase, requiring another writer to step in and finish it. The writing team was also mandated by production to approve 4 scripts per month.

Following the success of the first season, the show was able to have more continuous storylines. Decroisette and show director Jérôme Mouscadet wrote the series' backstory during the break between season 1 and 2.<ref name="S">{{cite web|title=Q&A with Sophie Decroisette|url=https://en.codelyoko.fr/interviews/qr_sophie_decroisette.cl|website=CodeLyoko.fr|date=2016}}</ref> Before Romain left the project, the idea of Lyoko being created by a team of researchers had changed to just one: Franz Hopper. However his motivations and identity were never established. Decroisette revealed during production of season 4 that the full backstory would not be told in the show, as she considered it "very complicated... dense and [not] really important to the story."<ref name="i" />

The show's international success in the United States also affected production. Romance elements were ultimately reduced after season 2 to appease American audiences.<ref name="i" /> Aside from this, Decroisette otherwise noted that she "never felt censored" while working on the series, apart from a self-imposed restriction to write stories appropriate for children.<ref name="S" /> Bruno Regeste became head writer for ''Code Lyoko'''s final season after Decroisette stepped down while she was pregnant with her second child, though she continued writing scripts and closely monitored episodes involving Replikas.