Code Lyoko: Elisabeth Sissi Delmas

Elisabeth "Sissi" Delmas (voiced by Jody Forrest) is the spoiled, arrogant, and in some ways selfish daughter of the school's principal,Jean-Pierre Delmas, and considers herself to be the most attractive girl in school. She is a former cheerleader, has shown to be a skilledbaton twirler, and once used a baton as a striking weapon and a club. She prefers to be called Sissi, and usually becomes angered whenever someone uses her full name - on fellow students, however, she uses physical violence. She is attracted to Ulrich (who has no feelings for her in return) and is jealous of Yumi (whom Ulrich is attracted to). Multiple times, she is seen stalking Ulrich, much to the annoyance of Team Lyoko. Undoubtedly snobbish and a spoiled child, during the first season she only rarely showed a more empathic side, mainly when the lives of others were in danger. She lightens up in the second season, and sometimes helps the group achieve victory, though she's not quite aware of the extent to which she helps. She admits in the first season episode "Holiday in the Fog" that all she wants is to be accepted by Jeremy and the others, which she gets in "Echoes" after discovering the factory and making a scene about it. The group uses a return trip to wipe her memory then accepts her to keep her from following them anymore and as a means of thanks for the various occasions she's been of help in the past, with Odd stating that school would be boring without her. It is eventually revealed in the second season episode "Ultimatum" that Sissi took Pencak Silat classes to impress Ulrich, but it didn't work. However, in "Canine Conundrum," her skills in martial arts had been dumbed down significantly. She was originally a member of the gang when they first discovered Lyoko and was intended to join them, but they decided to kick her out after she ratted them out during XANA's first attack. They used the return to the past and wiped her memory of the event and never again informed her of it, certain she would again reveal their secret.

In the first three seasons, Sissi wears a yellow hairband on her head which pulls her long raven hair back. She is dressed in a pink t-sleeved shirt with a yellow heart on it and usually the shirt's hem stops right about an inch above her belly button, which is very ticklish, and a dark pink mini skirt over red/purple trousers with pink shoes. In the fourth season, she does not have the hairband (replaced by two hair clips) and has a pink t-shirt with light blue jeans and red shoes. in episode 24 she is seen with the same outfit only a yellow shirt with a pink heart due to Xanas mistake