Originally a denizen of Lyoko, the pinkish-red haired 'princess' whose materialization was the main goal of Jeremie during the first season.
Druing the second season, she was found to be from the real world and was trapped in Lyoko with her father, Franz Hopper, 10 years before the start of the story. Her original form was a sort of cyber elf, while her 4th season avatar is a winged warrior of sorts.