Sissy/ Elisabeth

Sissi shoots her trademark glare at one of her opponents.

Sissi's new Season 4 Appearance

Elisabeth "Sissi" Delmas is a mean, prissy, spoiled and popular student at Kadic. She often pesters Team Lyoko, most of the time to win Ulrich's affections. However, it seems that her mean actions toward Team Lyoko is an attempt to gain attention and respect from them, as she admits in Holiday in the Fog, much to her tearfulness. She is very obnoxious, annoying, and much of a control freak and a spoiled brat, but nevertheless manages to always have two cronies by her side. She is also the daughter of Mr. Delmas, the principal of Kadic, the boarding school she attends and lives in. She even has her own room there.

Description

Not much is known about Sissi's family life except that her mother is supposedly dead (this is evidenced in Contact). She is approximetely 13 (or 14) years of age, and is currently in the eighth grade .
Sissi's voice is very high and childish, as well as bratty. She often whines and yells for people.
She is quite mean to the Lyoko Warriors, particularly Yumi (for also loving Ulrich) Her two "friends" are Herb and Nicholas. Herve actually is in love with Sissi, he even modeled his robot (Iron Sissi) after her but she doesn't seem to notice.

Sissi's part in the discovery of Lyoko

When Xana sent out his first attack, Jeremy knew he had to send someone to Lyoko to deactivate the tower, so he asked Ulrich to help him find a guinea pig. Ulrich decided to use Kiwi, Odd's dog. Earlier that day, Sissi

Sissi in her season 4 outfit

asked Ulrich to go to her dorm so they could hang out that night, but when Ulrich never showed up, she went out looking for him. She and Odd found him taking Kiwi to the factory. They followed him and discovered the lab where Jeremy was studying Lyoko. Odd accidently became virtualized into Lyoko when he tried to get Kiwi out of the scanner. After he was virtualized, Jeremy told Ulrich that Odd was in trouble since monsters were coming after him. Ulrich suggested that Jeremy send Sissi and himself to Lyoko to help Odd. Ulrich then explained to Sissi that Lyoko is a virtual world where monsters try to kill you. Sissi became scared and nervously refused, saying that she liked the real world, and that she couldn't miss cheerleading practice the next day. Sissi saw him off to Lyoko, then went upstairs to where Jeremy was. Xana started attacking Jeremy with cords, and Sissi started screaming and crying. Finally, Odd and Ulrich came to help. They destroyed the cords, and Xana retreated. The next day, Sissi was seen hanging out with Ulrich at breakfast, when Odd came up to them and started talking about Lyoko before asking where Jeremy was. Later, Sissi, Ulrich, and Odd were all seen hanging out in the courtyard when Jeremy approached them and told them that after they devirtualize Aelita (Mya) he would shut down the super computer. He needed them to go to Lyoko one last time to see if they could help her materialize. Ulrich pointed out that only two of them would be too little of a group to defend against the monsters, and that they would be stronger if Sissi would come with them. Sissi told them that she would love to go to Lyoko, but she was going to wait until after cheerleading practice to go. Jeremy thanked her for her support, then told the group that after Aelita (Mya) is materialized, they would shut down Lyoko. Jeremy then made everyone promise to not say anything about Lyoko to anyone. They all promised to keep their mouths shut, then Sissi said she couldn't wait to see what she looked like on Lyoko.
After cheerleading practice, Sissi went into her room, only to be attacked by Xana by being electricuted. Odd and Jeremy heard about this and rushed to the factory. Sissi woke up in a hospital, where her father and Jim were, and told them that they had to hurry and save Ulrich, Odd, and Jeremy because they were in danger. She told them all about Lyoko, then made them come to the factory to see for themselves. When they arrived at the factory, Ulrich yelled at Sissi for breaking her promise, and she was kicked out of the group. Jeremy then launched a return to the past, and Sissi forgot all about Lyoko since she was never virtualized, and Yumi took her place in the group.
This shows that Sissi was the original female member of the Lyoko Warriors, and was going to help them fight on Lyoko, but was replaced by Yumi before she could, since she ratted out on the Warriors to Jim and her father Mr. Delmas.