Editing Code Lyoko (section)

===Recurring characters===
* '''Elisabeth "Sissi" Delmas'''
:Voiced by: [[Carole Baillien]] (French);<ref name="french cast" /> [[Christine Flowers]] and Jodi Forrest (English)
:The principal's daughter and a Kadic student. She is a mean, spoiled, conceited, but also beautiful and somewhat popular girl who has had a huge crush on Ulrich since before attending Kadic. Sissi and Odd quite often make fun of each other, with Odd making clever comebacks whenever Sissi says something rude or whenever they need her to go away. After Aelita is first materialized, she often does the same. Sissi tends to make fun of and openly insult Yumi in particular, mostly due to Ulrich liking Yumi more than her. Sissi is often followed by Herb and Nicolas, whom she often shows resentment towards, but uses them to her advantage anyway. She was initially part of the gang and knew about Lyoko, but was kicked out after breaking her oath to keep the Supercomputer a secret. Her memories of Lyoko were subsequently erased. She becomes friends with the Lyoko Warriors at the end of the series. Sissi also shows a dislike for her full name, Elisabeth, often making sounds of disgust when it's mentioned and also  She was wear any outfits bare her midriff in the series.

* '''Herb Pichon'''
:Voiced by: Bruno Mullenaerts (French);<ref name="french cast" /> [[David Gasman]] (English)
:An eighth-grader at Kadic and a classmate of the Lyoko Warriors. He is the second-in-command of Sissi's gang, and sometimes even the boss in times of emergency when Sissi proves to be incompetent, as he is the most intelligent member of their group. Herb is also shown to be in love with Sissi, although he doesn't tell her because of her crushes on various boys, most notably Ulrich. He is the second-best student in his class after Jeremy and the two often compete with each other, but Herb is almost always the loser. Herb is also shown to be easily scared off, quick to run away when something troubling happens.

* '''Nicolas Poliakoff'''
:Voiced by: [[Carole Baillien]] (French);<ref name="french cast" /> Matthew Géczy (English)
:An eighth-grader at Kadic. He is the third member of Sissi's gang. He usually does not show much intelligence, which is commonly conveyed through his frequent use of pauses and uhs in speech. He usually only does things when Sissi orders him to, and will otherwise not do much on his own. Nicolas also has also been shown to have a crush on Aelita, although he never acts on it. He can play the drums, and was in the Pop Rock Progressives, a band started by Odd. He is generally more tolerant of and less rude toward the Lyoko Warriors than Herb and Sissi are. In some episodes, it is shown that he has at least some degree of intelligence, as he wrote a script for a performance of [[Romeo and Juliet]]. Nicolas is also shown to be as easily frightened as Herb is.

* '''Jean-Pierre Delmas'''
:Voiced by: Bruno Mullenaerts (French);<ref name="french cast" /> Allan Wenger (English)
:The principal of Kadic Academy, who is easily controlled by his daughter Sissi. He can be stubborn and incredibly ignorant at times, especially when members of the Lyoko Warriors are trying to convince him of any dangerous activity caused by X.A.N.A. His appearance is based on [[Hayao Miyazaki]].

* '''Jim Morales'''
:Voiced by: Frédéric Meaux (French);<ref name="french cast" /> [[David Gasman]] (English)
:The physical education teacher of Kadic Academy and the chief disciplinarian. He is frequently mentioned to have had an extensive job history, although whenever it comes up, he almost always ends up dismissing it by saying, "I'd rather not talk about it." Jim is often shown to digress from his lectures as he starts to reminisce on stories of his past, usually before being interrupted by someone or cutting himself off. On several occasions, Jim has discovered the existence of Lyoko or X.A.N.A. and displayed his helpfulness and willingness to keep it a secret, however, his memories are always erased through the use of "Return to the Past." One of his more notable secrets is that he once starred in a film called ''Paco, the King of Disco''.

* '''Suzanne Hertz'''
:Voiced by: Nathalie Stas (French);<ref name="french cast" /> Jodi Forrest (English)
:Usually referred to as Mrs. Hertz, she's a science teacher at Kadic. She is the most shown primary academics teacher in the series and appears to teach most branches of science at Kadic. She is also the only faculty member shown to organize field trips, which happens on several occasions. She has been shown to dislike or be disappointed in Odd and Ulrich, but takes a liking to Jeremy, and later Aelita.

* '''Milly Solovieff and Tamiya Diop'''
:Milly voiced by: Mirabelle Kirkland (English)
:Tamiya voiced by: Julie Basecqz (French);<ref>{{cite web | url=https://www.juliebasecqz.com/voxographie-2 | title=Voxographie – Julie Basecqz – site officiel }}</ref> Barbara Weber-Scaff (English)
:The sole members of the Kadic News crew, who are both are in sixth grade and share a dorm room. Tamiya is of [[Afro-French|Franco-African]] descent and seems to be less driven by her emotions, which allows her to think more clearly than Milly when bad things happen to them.

* '''Hiroki Ishiyama'''
:Voiced by: Guylaine Gibert (French); Barbara Weber-Scaff (English) 
:Yumi's younger brother. He is often shown pestering her about things and purposely being annoying, such as asking her to do his homework or mentioning her feelings for Ulrich. He is frequently shown playing on a [[Game Boy|handheld gaming device]], and is often shown with his friend, Johnny Cleary. Hiroki has, on occasion, assisted Yumi when she needed it, although he usually requires some form of bribe.

* '''Takeho and Akiko Ishiyama'''
:Takeho voiced by: David Gasman (English) 
:Akiko voiced by: Barbara Weber-Scaff (English) 
:The parents of Yumi and Hiroki. Takeho is shown to be a fairly typical semi-strict busy father and works for a local branch of a Japanese company. Akiko is depicted as a typical non-working housewife and is generally the first one to ask Yumi if something is wrong. When her parents appear in an episode, it usually focuses on Yumi's family issues.

:It is implied that Takeho and Akiho have a low-key fractious relationship, with semi-frequent arguments that their children sometimes overhear. This seems to contribute to Yumi's reserve, and possibly, her reticence in pursuing a more serious emotional relationship with Ulrich.