Normally, Sissi wears a pink outfit, which consists of a dark red skirt over darker red pants, and a pink belly shirt with a heart on it that has puffy sleeves.

One of Sissi's favorite passtimes (or obsessions, depending on your interpretation of her character) is to bother Ulrich tirelessly. If she's not scheming to get him to go out with her, she'll be trying to annoy him and his friends.

Notes:

• Sissi was not in the pilot episode, "Garage Kids."
• In "Frontier," Ulrich kissed Sissi in order to get her to manipulate her father so that he wouldn't punish Yumi. He also ended up having to date her for a month for the little favor.
• In "Log Book," Sissi blackmailed Ulrich with the threat of showing his diary to the public (which, I might add, contained entries about Lyoko and Xana.) He was supposed to go out with her as long as she had the diary.
• In "Swarming Attack," Sissi wrote Ulrich a love letter and signed Yumi's name, so that when he confronted Yumi about it he'd be embarassed.
• In "The Trap," Ulrich and Sissi got stuck together in an elevator that was filling with water, and they were nice to each other for once. Ulrich had a broken arm which Sissi treated, and he hugged her.
• As a general rule, Sissi does not do well in school. She got in trouble with her father in "Final Mix" for failing a test, and in "New Order," she went shopping while she was supposed to be working on drawing pictures of plants in the woods for science. She has been seen reading beauty magazines in class as well.
• Sissi hates being called 'Elizabeth.'