This page is about the Miscellaneous Characters in the Code Lyoko franchise who are not noteworthy enough to have their own pages, but have more information than just their names in the List of characters page.
Peter Duncan was a French criminal. Duncan was arrested prior to the beginning of "Common Interest" for various crimes, including art theft, safecracking, kidnapping, and bank robbery. He claims to not talk to cops. X.A.N.A. possessed him during prisoner transport. Duncan then escaped, and walked through the woods to a uranium transport truck. Duncan stole the uranium, and walked back to the Supercomputer. He passed out several times on the way, due to supercomputer failures. He kidnapped Jeremie from the local hospital, and forced him to install the new rod. Duncan attacked Jeremie after the rod was swapped. Once the tower was deactivated, the Lyoko Warriors dropped him off at a police station.
Engineer of the nuclear plant / Kadic's Math TeacherThe Engineer of the Nuclear Plant was an engineer shown in "Seeing Is Believing". His job was working at the nuclear plant in Paris, as the chief engineer. He was particularly concerned with safety. His character design was used again as the Kadic's math teacher in "False Start", it's unknown why the producers used the same design for two people, maybe it was the same person or maybe not, but neither the engineer nor the math professor reappeared later in the show after "False Start" (so this character only appears in the first season). Besides that, the official math teacher in the Kadic Academy is Mrs. Meyer.
Doctor Delâcre (pronounced as "Del ae ker") was a doctor of a hospital in Boulogne-Billancourt, that appeared in "Common Interest" when he took care of Aelita and became surprised because her heart had stopped and suddenly it had returned to beat without any medical explanation, and in "Contact" when he took care of Sissi under Franz Hopper's mysterious possession trying to contact the Lyoko Warriors. His name was revealed in Yumi's call to Jeremie, and in episode transcripts. He also appeared as a brief background character in "Killer Music".
Kelly made her first and only appearance in "Music to Soothe the Savage Beast" when she was Odd's date. They later broke up after she and Odd were caught by Sissi, who revealed that Odd traded her ticket to see the Subdigitals live in exchange for a date with Ulrich.
Her hair is long and brown. She was voiced by Barbara Weber-Scaff.