For tropes that apply to these characters in both series, as well as more detailed biographies of characters from the first series, please refer to the Code Lyoko character page. Characters from Code Lyoko will not be listed here until they are confirmed to appear in Code Lyoko Evolution.
The Lyoko Warriors
Played by: Quentin Merabet
At the end of Season 4, XANA implanted one of his source codes in Ulrich's body, and as a result he can now deactivate towers. On a personal level, he is still trying to confess his affections to Yumi, and is still jealous of William for his efforts to get Yumi's attention.
Doppelgänger Attack: After a long period of disuse dating back to the second episode of the original show's 4th season, Ulrich's Triplicate power makes a comeback to help dispatch a Ninja in episode 14.
Hero Stole My Bike: William uses the Overbike in the fifth episode just to get on his nerves.
Moment Killer: Had this happen to him at least three times in the first episode.
The Rival: With William. There was even a whole episode about it. Both seem to have gotten over it, though.
Odd Della Robbia
Played by: Gulliver Bevernaege-Benhadj
Odd is slightly more mature in the new series, but is still be a source of humor. He can now fire six arrows at once on Lyoko. Kiwi is no longer living with him, having been left in the care of his sisters. He is overjoyed to be back on Lyoko. He also has XANA's source codes in his body, and can also deactivate towers.
Adaptation Dye-Job: The live-action Odd has light brown hair, rather than in the previous series where he had blonde hair. That hairstyle is retained for his 3D form, and he does keep his purple spot in both forms, but it is moved further down his head so it looks more natural (i.e., growing from the roots).
Butt Monkey: Amazingly even moreso than he was in the original show; he gets the most frequently victim of the Spectres' attacks, his dating life is getting messed up, William has no respect for him...
Yumi receives a new weapon, the "Yumi Stick", and her Overwing has been modified. She can deactivate towers now, just as Odd and Ulrich do.
All-Loving Hero: A trait that wasn't developed in her original incarnation, this version of Yumi displays concern with helping people outside of the virtual. She attempts to make a caricative party in order to send the money to victims in Japan, and, when asked what she would do if the won millions, answers she would just give everything to associations.
Big "NO!": When William gets devirtualized and she finds herself facing two Ninjas alone.
Jérémie reprises his role as the Supercomputer's main operator, and is now dedicating his time to figuring out new ways for his friends to navigate the Cortex and avoid XANA's specters.
Idiot Ball: He and Aelita suffer a drop in IQ whenever Laura is involved. Taken to ridiculous extreme when he fails to notice she has been reading the Return to the Past codes and modified the virus she conceived for them so it would protect her memory from it, all of this right under his nose. And that's just the beginning; a lot of episodes have Aelita and Jérémie acting outright incompetent just so the episode can have Laura show up.
Limited Wardrobe: In a sense. While Jérémie does wear different outfits each episode, they all happen to be khaki pants and plaid shirts.
Took a Level in Jerkass: Jérémie is rather more abrasive in this series, and even more obsessed with Lyoko than ever before.
Played by: Léonie Berthonnaud/Romane Bouyer (flashback)
Aelita is the one that makes the decision to turn the Supercomputer back on after witnessing XANA-like electrical phenomena at Kadic. She finds a picture of her father in the Cortex, and is from that moment determined to find out why it is there. She is jealous of Laura's presence on the team.
Deflector Shields: Aelita had already demonstrated the ability to create shields in the original series, but here they prove even more versatile. She use one to protect the megapod in "Madame Einstein", and another to reveal the Invisible Monster in "Rivalités". She can't maintain them against the superior firepower of the wall of Bloks in "Compte à rebours", though.
Genre Savvy: She is the first to suspect XANA's return when his attacks start again.
Green-Eyed Monster: Towards Laura. In "Miss Einstein", she unilaterally decided to prevent Laura from joining the group by activating the RTTP, which she makes pretty clear to Odd is mostly out of jealousy.
Green Eyes: Though it is difficult to tell, Aelita does indeed have green eyes in her 3D form.
Took a Level in Jerkass: Contrary to her personality in the previous series, this version of Aelita is considerably more aggressive, to the extent that, when the team attempts to vote on whether to include Laura or not, she preempts the vote and activates the RTTP. She gets called out on it by Odd, but it's pretty clear she doesn't feel guilty about it. This might be justified by the fact that her father died in the season finale of the last series (hence no real development on that front), but it's still quite the change in behavior. Also, see her attitude in "Rendez-Vous".
Played by: Diego Mestanza
Post-possession, William has effectively been kicked out of the Lyoko Warriors for his actions in Code Lyoko, as the others make a point of not inviting him to the factory when duty calls. This has enraged him on multiple occasions, and he will go to the factory on his own and demand to be taken to Lyoko when he suspects that they are there without him. He has proven a capable fighter on Lyoko, and is finally accepted back into the team in episode 5.
The Atoner: Let's just say he works hard to make up for his rampages as XANA's Dragon.
Dark Is Not Evil: Despite now being on the side of the Lyoko-Warriors, William retains his black, XANA-era costume and Super Smoke power.
The Determinator: He still isn't giving up on Yumi. He even delivers a speech to Odd about how it's never a good idea to give up.
Jerk with a Heart of Gold: Despite his antagonism with Ulrich, he still choses to try convincing the Stern boy to do the right thing after he argued with Yumi. He also confess that his new level in Jerkass was because he was frustrated to be seen as the bad guy.
Leeroy Jenkins: A lot less so than he was the first time he went on Lyoko, but he still has his moments. In "Compte à rebours", his attitude causes Yumi and him to be quickly defeated by a wall of Bloks.
Reformed, But Rejected: He definitely is reformed, but the Lyoko Warriors aren't much more forgiving toward him than they were at the end of season 4 of the original show; it takes five episodes for him to be truly reintegrated to the team, much to his dismay.
The Team Normal: Not in the sense that he doesn't have any powers (on the contrary, actually), but he is the only one in the team with no XANA code inside him (ironically), and as such can't desactivate towers.
Took a Level in Jerkass: William in the original series could be a bit aggressive toward Ulrich when it was about Yumi, but was otherwise a relatively nice guy before XANA possessed him. Here, however, he is bitter about not being accepted by the Lyoko Warriors, leading him to act a bit unsympathetic on occasions. Even after being back on the team, he still acts a lot more antagonistic toward Ulrich than he used to. This is toned down starting with episode 6, but he still has some moments of being a big jerk.
Played by: Pauline Serieys
A New Transfer Student introduced in "Madame Einstein". Laura is basically a feminine alter-ego of Jérémie — she's a giant nerd and a big fan of video games (programming them, not playing them). She's curious and ambitious, and slowly integrates herself into the group, causing Aelita to grow jealous of her.
Audience Surrogate: The main reason she was added to the cast was to create a character that would be unfamiliar with Lyoko and ask questions, allowing the new watchers unfamiliar with Code Lyoko to catch up.
Bad Liar: When Mr. Graven does interviews in episode 17, trying to track down people with knowledge of quantum physics through the use of a test, Laura lies about the subject only to correctly answer a following question which would require expertise in it. It doesn't take him long to get to her after that, though Aelita steps in before she agrees to anything.
Education Papa: Her father is quite insistent that she get a good education, to the point of wanting to move her to another school simply because Kadic is suffering from a computer glitch their staff cannot fix (XANA was attacking the system).
Fan Nickname: Before her name was revealed, "Unknown Blonde Girl" or simply "Blonde Girl".
Genre Savvy: She learned of the existence of the Return to the Past while helping Jérémie design a virus to infect the Cortex, and realized right away that they were going to use it to get rid of her once she was done. To stop them, she snuck a subroutine into the test virus used on Lyoko's core that would allow her to keep her memory, forcing the Lyoko Warriors to integrate her.
Insufferable Genius: Not to the point of arrogance, but she does tend to be a bit condescending; "It's simple" or "a child could do it" are her common answers to a problem Jérémie and Aelita fail to solve.
Jerkass: After figuring out that Franz Hopper is Aelita's father, but lacking any knowledge about why or when he disappeared, she asks Aelita (with more than a little smugness) if he favored his work over her. Aelita gets her own back, though, explaining that her father died protecting her, and asking if Laura's father could be counted on to do the same.
Laser-Guided Amnesia: After an ill-conceived attempt to destroy XANA in "Mutiny" which nearly got William turned back into XANA's servant, Jeremie somehow erases all her memories of the factory with the Return to the Past (evidently he fixed whatever method she used to protect herself).
She Knows Too Much: Inverted; because they're heroes, the fact that Laura knows about Lyoko and can't have her mind wiped means they have to keep her close by.
The Team Normal: Similar to Jérémie, being a non-combatant/secondary Mission Control. She almost gets virtualized in "Vendredi 13" as a last resort, but Aelita thought up a solution that negated the need. Laura was somewhat annoyed at being denied the chance.
Unwitting Instigator of Doom: Once she's had her memories erased, she finds the card for Tyron's company she kept when Mr. Graven stopped by. Upon contacting him, Tyron showed her pictures of the gang's Lyoko avatars, allowing him to identify them and figure out that they all go to Kadic.
The main antagonist of Code Lyoko. He has been resurrected and is using source codes implanted in the Lyoko Warriors to regain his strength. What he plans to do once he has regained his power is unknown.
Back from the Dead: Though all his Replikas were destroyed in the previous series, he survived by hiding inside a quantum supercomputer of similar design to the one hosting Lyoko.
Dangerously Genre Savvy: He doesn't let himself be fooled easily when the Lyoko Warriors try to trick him into absorbing fake codes. Several of his attacks have also involved using one tower activation to hide a second, more dangerous one.
A man introduced at the end of "Compte à Rebours", assumed by the Lyoko Warriors to be responsible for the creation of the Cortex. He used to work with Franz Hopper after the Carthage Project, but betrayed him at some point by using part of his research without his permission. In the present day, he is still involved with the Cortex, and is responsible for dispatching the Ninjas to deal with the incursions of the Lyoko Warriors.
Evil Counterpart: To Franz Hopper, as he's using Hopper's research for (as-yet undefined) nefarious purposes. He's also one to Jérémie, being the smart guy behind the operation and sends in his own team of humans into the virtual world.
Genre Blind: He doesn't think XANA is real, despite evidence to the contrary.
Goggles Do Nothing: Possibly. He sports a pair of them on his head, yet all we've ever seen him do is look at computer screens. It's unknown if they actually have a purpose.
Reasonable Authority Figure: A notable evolution compared to his original series counterpart, this Jim actually has more reasonnable and understanding reactions toward the students. For example, he's not really upset when Odd, who's talking gibberish as a result of a Spectre attack, makes off with his cell phone, assuming the poor kid simply buckled under the stress, and even decides to talk about it to Delmas so they can do something to help students be more healthy.
Took a Level in Kindness: While he still has a tendency to give detention quickly, this version of Jim acts less aggressive than his original series counterpart and is less quick to get angry. "Compte à rebours" even has him worrying about the students' health and go to talk about it with Mr Delmas.
Played by: Éric Soubelet
Adaptational Attractiveness: Delmas in the Original series wasn't exactly ugly, but he was a fairly old man with grey hair and glasses. Evolution Delmas is significantly younger and more attractive.
Played by: Sophie Fougère
Adaptational Attractiveness: She must have had some serious work done during the timeskip, or this is an entirely new character with the exact same name.
Adaptation Dye-Job: Mrs. Hertz's grey, poofy hair is now straight and brown. Lampshaded by Ulrich, of all people.
Lovable Alpha Bitch: Episode 21 details this, showing despite being often inconsiderate, she really is friends with the gang (a development made in the previous series' finale) and likes to hang out with Yumi and Aelita to do girly things.