Lyoko Warriors[]
- Jeremie Belpois
- Aelita Schaeffer
- Odd Della Robbia
- Ulrich Stern
- Yumi Ishiyama
- William Dunbar (Joined cast in Season 2, became a Lyoko Warrior in the end of Season 3)
Kadic Academy Students (Minor Characters)[]
Note: All students move up a grade in Season 3, and again in Evolution.
5th Graders[]
- Hiroki Ishiyama (Yumi's younger brother)
- Johnny Cleary (Hiroki's best friend)
6th Graders[]
- Milly Solovieff (Kadic's reporter)
- Tamiya Diop (Kadic's reporter)
- Ninon Costes
- Sandra Dialo
- Julie Vigourox
- Anouche Bedoyan
- Anne Sophie Munler
- Veronique Fayolle
7th Graders[]
Other 8th Graders (beside Jeremie, Odd, Ulrich, and Aelita)[]
- Laura Gauthier
- Elisabeth Delmas
- Herb Pichon
- Nicolas Poliakoff
- Jeremie Clone
- Aelita Clone
- Taelia
- Theo Gauthier
- Tania Grandjean
- Valerie
- Thiery Suarez
- Naomi N'guyen
- Yannick Piranet
- Alexandre Peppin
- Magali de Vasseur
- Claire Girard
- Paul Gaillard
- Matthieu Ducrocq
- Jean-Baptiste Pujol
- Heidi Klinger
- Bastien Roux
- Sorya Abulabbas
- Julien Xao
- Azra Ürgüp
- Thomas Jolivet
- Brynja Heringsdötir
- Sophie Florenceau
- Kelly
- Patrick Belpois
- Samantha Suares
- Romain Le Goff
- Jeanne Le Bihan
9th Graders (beside Yumi and William)[]
- Emily LeDuc
- Christophe M'Bala
- Anais Fiquet
- Caroline Savorani
- Maitena Lecuyer
- William Clone
- Priscilla Blaise
- Emmanuel Maillard
- Mathias Burrel
Adults[]
Teachers and Staff of Kadic[]
- Gilles Fumet - Social Studies Teacher
- Gustave Chardin - Art Teacher
- Hans Klotz - School Psychologist
- Jean Pierre Delmas - Principal
- Jim Morales - Physical Education Teacher/Dorm Manager
- Mrs. Meyer - Math Teacher
- Nicole Weber - Office Secretary
- Rosa Petitjean - Lunch Lady
- Suzanne Hertz - Science Teacher
- Yolanda Perraudin - School Nurse
- Ms. Kensington - English Teacher
Villains[]
More Major Characters And More Minor Characters[]
- Kiwi
- Waldo Franz Schaeffer/Franz Hopper (Aelita's father)
- Anthea Hopper-Schaeffer (Aelita's mother)
- Takeho Ishiyama (Yumi's father)
- Akiko Ishiyama (Yumi's mother)
- Mr. and Mrs. Stern (Ulrich's parents)
- Michael Belpois (Jeremie's father)
- James Dunbar (William's father)
- Mr. and Mrs. Della Robbia (Odd's parents)
- Samantha Knight
- X.A.N.A. Aelita
- X.A.N.A. Yumi
- X.A.N.A. Odd
- X.A.N.A. Ulrich
- X.A.N.A. Franz Hopper
- Mister Pück (Aelita's childhood toy)
- Subdigitals