Jeremy Belpois

Jeremy Belpois (voiced by Sharon Mann, also note Jérémie in France) is the brains of the group, directing their missions from the supercomputer and designing various programs to improve their chances of victory (though, as a recurring plot device, these programs almost always malfunction). Jeremy does not participate in the battles on Lyoko because he is needed back in the real world for technical support and to run the virtualization, devirtualization, and other computer programs in case of an emergency. He has attempted to visit Lyoko two times, the first time in the episode "Frontier" in order to make amends with Aelita, and again in the episode "Mr. Puck" to increase his resistance to Xana. He vowed never to return after the third time, due in part to his reportedly ridiculous-looking outfit and a poor experience with Xana's minions. For the 1st and 2nd season he is 12-years-old and in 8th grade. In the 3rd and 4th he is 13 and in 9th grade.

Jeremy has blonde hair. On Earth in the first three seasons, he wears a blue turtleneck, brown pants and blue-gray shoes. He also has glasses, because he is nearsighted. In Season 4, his outfit is a dark red long-sleeve shirt, brown pants with light blue stripes going down the side of the legs, and dark blue shoes. His pajamas are dark blue.

Something of a workaholic, Jeremy invests the majority of his time into finding ways of stopping Xana, having spent the entirety of season one trying to materialize Aelita onto the real world, and spent all of season two trying to make an anti-virus after Xana infected her. In season three, he spends most of his time trying to find a way to virtualize the group into the Internet directly, until Xana possessed the newly-inducted William and destroyed Lyoko. At the end of the season, Jeremy receives a message from Franz Hopper, and manages to recreate Lyoko using the code sent to him. In season 4, he spends the majority of his time locating Replikas, deciphering data from the Internet, and trying to free William from Xana. From Season 2 onwards, one of his major overall goals is to free Aelita's father, Franz.

He has a multiterminal computer of his own in his room, by which he develops programs, tests them prior to use within the factory's supercomputer, and, during the first season, communicates with Aelita within the supercomputer. He uses a screen saver that closely resembles the "falling green letters" theme used in The Matrix series of movies, supposedly a homage. He has a poster with a b&w photo of Einstein.

Often, his determination to fight against Xana will take priority and he will leave his friends in the interests of working more. They rarely respond positively to this; however, he usually finds a way to make things up by the end of the episode.

Jeremy was the one who discovered Lyoko, as well as Aelita, and over the first season he became very attracted to her. He is very attracted to Aelita's intellect, curiosity, and bravery, and although Jeremy can be shy at times, he has sought a romantic relationship with her, and it has been seen that Aelita feels the same way in many episodes. In the episode "Frontier" Jeremy gets in an argument with Aelita, and later tries to go to Lyoko to apologize. He was, however, trapped in between Lyoko and the real world due to an error in the scanning process. At the end of another episode Jeremy, Ulrich, and Odd came from Lyoko, where Ulrich jokes about how fast he was defeated by a Megatank. After that he said he would never go into Lyoko again. Jeremy's Lyoko form is never been seen in the series though. Odd describes it, tactfully, as "ridiculous." On Lyoko, everything on his screen uses symbolism. Aelita is a Yellow Arrow, Yumi, Odd and Ulrich are all Green Arrows, and XANA'S monsters are a Red Circle.

Technically, Jeremy has visited Lyoko a total of three times, including those mentioned above. Once, Xana had created a sort of fake earth within Lyoko, trapping Odd, Ulrich, and Yumi. Jeremy went to this fake projection of earth and stopped Xana with Aelita's help, however he was devirtualized immediately afterwards, and never actually went to Lyoko itself. This was also the first time Xana was seen and heard as himself.

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