Elisabeth "Sissi" Delmas - Popular and punkish 8th Grader

Elisabeth "Sissi" Delmas is an often mean, spoiled and popular student at Kadic. She often pesters Team Lyoko, most of the time to win Ulrich's affections. However, she admits in Holiday in the Fog that she is gaining their attention through her mean actions towards them. By so doing she is almost making enemies out of her would-be friends, instead of gaining any of their respect, much to her chagrin. At the end of the series, in Echoes, she achieves this at last and becomes an official friend of the group. She is also the daughter of Mr. Delmas, the principal of Kadic, the boarding school she attends and lives in. She is a major recurring character.
Herb Pichon - Friend of Sissi, 8th Grader

Herb Pichon (also spelled Hervé Pichon) is a ninth grader at Kadic and a classmate to 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 obviously the most intelligent in their group. Herb is also in love with Sissi, although he can't tell her because she has crushes on various people including Ulrich and Theo Gauthier.
Nicholas Poliakoff - Friend of Sissi, 8th Grader

Nicolas Poliakoff is a ninth grader at Kadic. He is a member of Sissi's gang, and mostly just stands there staring into space unless Sissi orders him to follow her. He is the stereotypical dumb, muscle kind of bully. It is still unknown why exactly Nicholas joined Sissi's "gang", but it is probably due to the fact Herb did. Nicholas also has a crush on Aelita, but has never acted on it.
He can play the drums, and is in the Pop Rock Progressives, a band started by Odd. As a result, he is certainly more tolerant of and kinder toward Team Lyoko than Herb and Sissi are. In some episodes, it is shown he has at least some degree of intelligence, as he wrote the play in Laughing Fit. Nicholas is also easy to scare, as is Herb.
Emmanuel "Mike" Maillard - Average 8th Grader, drummer

Mike isn't a very popular kid. Nor is he unknown either. He's pretty generic in a lot of ways, though he is pretty friendly and is willing to help others in need. Though, a XANA attack would surely scare him into submission. He wears a long-sleeve red shirt, with a black t-shirt over top, and usually shorts. He wears a necklace around his neck. He has long black hair, kept some in a ponytail.