Characters / Code Lyoko

For tropes and descriptions that apply to Code Lyoko: Evolution, please refer to its character page.

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The Lyoko Warriors

    In General 
  • Badass Crew: Even when not on Lyoko, Ulrich and Yumi possess advanced martial art skills, Odd is athletic and relatively good at adapting to situations, and Jérémie is able to help as much as the others without even fighting. It's saying something that they fought against XANA's attacks several times and still survived long enough for Aelita to deactivate the towers.
  • Color-Coded Characters:
    • Ulrich: Green (in the real world)/ Yellow (on Lyoko).
    • Odd: Purple.
    • Yumi: Black (in the real world)/ Red (on Lyoko).
    • Jeremy: Blue.
    • Aelita: Pink.
  • Dangerous Forbidden Technique: The Return to the Past becomes more or less this for them once they realize its side effects. Using it allows them to instantly reverse any damage XANA might have done with his attacks (safe for actual death, but it does saves people who are about to die) and cancel any breach to their secret without having to kill or blackmail witnesses. However, each time they use it gives XANA a permanent boost in power and intelligence. By season 2, they make a strict rule of using it only as a last resort, to the point Ulrich nearly gets fired from the group when he tries to use it for a personal reason.
  • Digital Avatars: The way they go on Lyoko.
  • Fire-Forged Friends: Later on, thanks to Character Development.
  • Hero Secret Service: Odd, Ulrich, Yumi and Jérémie are this to Aelita.
  • Immune to Mind Control: Their multiple travels on Lyoko and fight against monsters have allowed them to build a resistance to the Spectres' XANAfying by the time XANA developped the ability. The only exceptions were Jérémie (who has since been on Lyoko shortly to fix this) and William due to having spent most of his time on Lyoko controlled by XANA anyway.
  • Kid Hero: They're still in school.
  • Medium Blending
  • Ordinary High School Students: When not fighting XANA, they are this.
  • Pajama-Clad Hero: On occasion, the Lyoko Warriors rush to the factory in their pajamas (shoes not included).
  • Playing Sick: A regularly used method to escape school when XANA attacks.
  • Powers as Programs: A literal example; the powers are programs.
  • Recruit Teenagers with Attitude: Justified; they weren't "recruited" by adults in the first place, Jérémie (who is himself a teenager) just happened to find the Supercomputer and assembles a bunch of comrades of his age for help because he is afraid adults would want to destroy the Supercomputer or shut it down without leaving him the time to find a way to materialize Aelita. Plus, the one time they try to break the secret and ask adults for help, no-one believes them.
  • Ripple Effect-Proof Memory: Courtesy of their memory being registered in the Supercomputer, they are immune to the Return to the Past memory-erasing effects.
  • Stealth Hi/Bye: They frequently pull this kind of exit on any bystander whenever they hear about a XANA attack. Actually Lampshaded by William about Yumi in "Sabotage":
    William: As usual, she couldn't wait to give me the slip...
  • Teens Are Short: All of them are quite short.
  • Teeth-Clenched Teamwork: At their beginning, they had limited loyalty to each others besides keeping the secret and would often argue or be missing (in "Gravity", Ulrich flat-out refuses to help deal with the current attack so he can take part in a soccer match). They get better over the course of the series.
  • To the Batpole!: Reaching the Hacker Cave where the virtual action starts involves skateboarding (or riding a scooter in Jérémie's case) through a sewer, rappelling down ropes in an abandoned factory, taking an elevator locked by impressive blast doors... and finally being dematerialized in high-tech scanners with the obligatory Invocation.
  • True Companions: By season 3-4, they have grown into this.
  • Two Girls to a Team: Aelita and Yumi.
  • Wake Up, Go to School, Save the World: Pretty much their job.

    Ulrich Stern
Ulrich Stern

"Who's the dork that pushed me into Sissi's arms?"

Voiced by: Marie-Line Landerwijn (French) Barbara Weber-Scaff (English)

The unofficial hero of the show, and the main favorite of fangirls. He is a quiet and introverted person by nature, quite the opposite of his best friend, Odd. Headstrong and stubborn, he cares for his friends and would do anything for them. Ulrich is more athletic than academic and it shows when you compare his grades to his sports performance. He attracts the attention of many females of the school, but has obvious feelings for Yumi. He manifests in Lyoko as an unarmored samurai, with the ability to "Triplicate" into three of himself, and Super Speed. His katana can deflect XANA's creatures' energy attacks.
  • Abusive Parents: Ulrich's emotionally abusive dad; he seems to only care about his son for his grades, and, if Ulrich's talk is anything to go by, hasn't talked to him for a year. Not to mention his mother who acts as an enabler by sitting by and watching her husband berate their son.
  • Achilles' Heel: He has vertigo, which flares up at rather inconvenient times. This is presumably the reason his vehicle is the only one with a wheel, whereas the other two can fly.
  • Achilles in His Tent: Wound up in the proverbial tent after being kicked off the team briefly.
  • Badass Normal: Even in the real world, Ulrich is no slouch with a sword. In the episode "A Bad Turn", he uses a katana dropped by Yumi's father to fight a materialized Krabe, and manages to cut one of its legs off and block several laser bolts, one of which was about to kill Yumi.
  • Bad "Bad Acting": He terribly plays Romeo in "Laughing Fit".
  • Battle Couple: With Yumi.
  • Big Man on Campus: Considered handsome by almost every girl in Kadic, and a skilled soccer player to boot. Notably, he is not exactly happy with it, as it causes him to have Sissi as a Stalker with a Crush.
  • Book Dumb: He is far from being actually dumb, but his grades are mentioned to be bad in later episodes, especially season 3 (though it's left ambiguous whether he really is bad at school of if he merely lacks time to revise due to the time spent fighting XANA; in at least one episode, he manages to focus on his work for a while and actually gets decent grades). This is the major source of his tensed relationship with his father.
  • Bring It: Like Odd, he sometimes does the "bring it" Bruce Lee gesture.
  • Calling the Old Man Out: In the season 3 finale, his father comes to Kadic to talk to him about his bad grades. At first Ulrich silently submits himself to his criticisms; then his father suggests his friends are the cause of his grades, and Ulrich replies with this trope:
  • Casual Danger Dialog: Not as much as Odd, but when his friend isn't around he feels the need to take his place at making lame jokes.
  • Cannot Spit It Out: He likes Yumi. A lot. But he never manages to articulate that — even in the face of competition.
  • Chick Magnet: Yumi, Sissi, Milly, Émilie, and most fans have all wanted a piece of him at some point or another.
  • Crazy Jealous Guy: Especially when William enters the picture.
  • Create Your Own Villain: His unwarranted rejection of Sissi after her "betrayal" of him and the group is what sets her off to become the school Alpha Bitch and a thorn in the group's side. He eventually seems to realize this and by Season 4 is nothing but polite to Sissi even when annoyed by her, culminating in him inviting her back into the group as a friend.
  • Deadpan Snarker: Mainly toward Sissi and Odd, but the others also get their part of it.
  • Green-Eyed Epiphany
  • Green-Eyed Monster: Ulrich can be especially jealous when it comes to Yumi.
  • Jerk with a Heart of Gold: In the prequel, he is much more antisocial, being actively antagonistic toward Yumi just because she beat him in martial arts practice, treating Sissi with disdain especially after a misunderstanding between them which makes her home an Alpha Bitch, acting displeased by Odd now sharing his room, almost denouncing him to Principal Delmas when discovering he brought Kiwi in secret to Kadic, and even later attempting to use Kiwi as a test subject for Jérémie to see if the virtualization process works. Doesn't prevent him from coming to Jérémie's help twice when seeing him in danger, going on Lyoko to rescue Odd without hesitation when he gets virtualized instead of Kiwi and actually showing concern for Aelita's plight. Judging by how he is portrayed in other episodes, it seems like teamwork eventually made him a better person.
  • Just Friends: With Yumi. Even by the end of the show, it's left unclear if their relationship is solved or not.
  • Love at First Punch: He first met Yumi as a sparring partner in a martial arts class.
  • Meaningful Name: "Stern" for The Stoic.
  • Mr. Fanservice: In-Universe. He also qualifies out of universe too, as the writers seem to have went out of their way to have him provide Fanservice every now and then.
  • Sarcastic Devotee: Never misses a chance to snark about Odd's ego and love life, but the two get along like the best of friends.
  • She Is Not My Girlfriend:
    • In regards to Yumi.
    • Even more so to Sissi, but he doesn't really like her anyway.
  • The Stoic: He does occasionally shows emotion, typically his Unresolved Sexual Tension with Yumi and occasional outburst, but overall he is much calmer than his teammates.
  • Straight Man: To Odd's comic relief.
  • Twice Shy: With Yumi.
  • Unresolved Sexual Tension: With Yumi.
  • "Well Done, Son!" Guy: A whole Ulrich-centered episode has him constantly seeking approval from his ultra-exigent father. He gets it in the end... at the apparent cost of his father's life. And then promptly has it Reset Button'd. Poor guy.
  • Why Did It Have to Be Snakes?: Why Did It Have to Be Heights?
  • Will They or Won't They?: With Yumi. According to the Series Finale "Echoes", they will... but it was highly tentative.
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    Odd Della Robbia
Odd Della Robbia

"That's just the Magical Odd Effect. You see me once and you feel as though you've known me all your life!"

Voiced by: Raphaëlle Lubansu (French), Matthew Géczy (English)

The only extravert of the Team, and an incorrigible smart-aleck. He dresses in flashy, clashing colors, mostly purple and yellow. Though physically petite compared to the rest of the team, he is an adrenaline junkie, just the type to go for extreme sports. Also a passable student; his strengths are in the languages and artistic classes. He's a big flirt who's dated about every girl in his grade (most of them for only a day or two) as well as a few others. He has smuggled his small dog, "Kiwi", into the dormitories. In Lyoko, his avatar is a Cat Boy version of himself, including claws and a tail. He has heightened agility and stamina in this form, and can shoot "Lazer Arrows" from his forearms — which, for a time, tended to run out of ammo at the worst possible moments. This shortage was resolved in Season 2 at the expense of another of Odd's powers, the "Future Flash" which offered spontaneous visions of the mostly immutable immediate future. This left Odd with the short end of the stick powers-wise, a fact lampshaded in Season 3's "Triple Trouble" when Jérémie tries to give Odd a teleportation ability, but ended up making two clones for him instead, and the clones wind up not disappearing when no longer needed. At least he still has a marginally useful energy shield, granted as part of the Season 2 power realignment.
  • Anime Hair: A rare justified example: he is explicitly mentioned to use gel to keep his hair that way (though that doesn't explain the bi-color part). Notably, he originally had a regular hairstyle in the prequel, and changed it according to what he looks like on Lyoko (twice).
  • Big Eater:
    [seeing Odd wolfing down food for the first time]
    Ulrich: You always eat like this?
    Odd: No, it's just I'm not very hungry today.
  • Boisterous Bruiser: In training. He's too young to drink, but he gets the eating, womanizing, battle-happy and fun-loving elements down pat.
  • Book Dumb: He is absolutely terrible at school, and apparently manages to keep decent grades only by cheating and copying Jérémie's notes. However, he is also shown to be quite creative on the artistic side of things, and while he has absolutely zero sense of strategy, he is quite capable of improvising, so he has some smart.
  • Bring It: He's fond of the "bring it" Bruce Lee gesture.
  • Butt Monkey: Gets the least respect in his group, does badly in school, has absolutely no luck with his love life, and, as he lampshades, is "the only one who looks like a nitwit on Lyoko".
  • Camp Straight: He does look a bit effeminate (to the point of leading to Viewer Gender Confusion from some fans), dresses in pink and purple, and speaks in a high-pitched voice. Graphic errors such as the occasional lack of undershirt, or his voice in the French dub, don't help either. Ironically, however, he is clearly shown to not only be straight, but also very interested in girls. Of course, that doesn't stop the Yaoi Fangirls from imagining things...
  • Casual Danger Dialog
  • Catch Phrase: "T'y crois pas!" ("Can't believe it!")
  • Crazy Enough to Work: Almost everything he does is this. See Leeroy Jenkins.
  • Crouching Moron, Hidden Badass: For all his silly jokes, Butt Monkey status and tendencies to go crazy in fight, Odd definitely is a skilled fighter. At several points, he has been able to deal with large amount of monsters entirely on his own, escape or distract Xanafied people on Earth and save Aelita. Not to mention he is the one who finally takes down William, allowing the Lyoko Warriors to get him back.
  • Empowered Badass Normal: When Jérémie used a Tower to gives him powers for a short amount of time so he could fight toe-to-toe with a XANA-possessed Yolande.
  • Expository Hairstyle Change: In the prequel.
  • Face Palm
  • Insistent Terminology: "I'm not scrawny, I'm svelte."
  • Is It Something You Eat?
  • Keet: Short, skinny, hyperactive, Camp Straight, he fits this trope like a glove.
  • Kid-anova: He has had relationship with almost every girl in his school, Yumi, Aelita and Sissi excepted (and even then, he once replaced Ulrich as Yumi's partner at dance, flirted with Aelita upon first meeting her, and Sissi gets moments with him several times too).
  • Leeroy Jenkins: He rarely has any strategy before charging; most of his tactics consist either in doing something completely crazy or going ahead shooting at the enemy. Even his own teammates have some doubt about his sanity.
    Aelita: You call this being careful? I call it being COMPLETELY NUTS!
    Odd: Isn't that the same thing?
  • Meaningful Name: Aside from the obviousness, "Odd" may also come from "Odr", meaning "tip of the arrow".
  • Mr. Fanservice: He has his share of fangirls. This is at least partly due to his Lyoko form... and the Sensual Spandex.
  • Multicolored Hair: He has blond hair with a purple spot in the middle of it. This carries over in his Lyoko form.
  • The Nicknamer: He's the one that names all the monsters (even complete with Xtreme Kool Letterz). As if that wasn't enough, two episodes reveal that he also calls some monsters by ordinary human names such as "Lucy-Ann". He's also responsible for Jérémie being called "Einstein" and Aelita "Princess" most of the time. He sometimes calls Ulrich and Yumi "Lovebirds."
  • Outnumbered Sibling: Odd reveals in the episode "Distant Memory" that he has five older sisters who bully him.
  • Screams Like a Little Girl: It's even worse in the original French version, where he actually sounds like a kindergarten girl even without screaming.
  • Shipper on Deck: He is very supportive of Ulrich's relationship with Yumi.
  • Ship Tease: Often with, ironically enough, Sissi.
  • Small Name, Big Ego: As he stated in the aptly-named episode "Bragging Rights".
    Odd: Yes, I'm a braggart, and I love it that way!
  • Static Character: The most noteworthy example on the show; he never changes.
  • They Wasted a Perfectly Good Sandwich: He hates this trope; he spends the entirety of the episode "Tidal Wave" complaining about not eating.
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  • Fragile Speedster: In Season 1. While he has as many Hit Points as anyone else, before Jérémie programs in his shield, he has no defenses except dodging.
  • Instant Cosplay Surprise: Again, in the prequel, he's the most baffled concerning his Lyoko Avatar:
    Odd: I don't dream about giant purple cats!
  • Super Reflexes
  • Taking the Bullet
  • Wall Crawl
  • Weapon of Choice: Lazer Arrows.
  • What Kind of Lame Power Is Heart, Anyway?: Future Flash. Not only does this power have very limited scope (Odd is the only one unable to use his power at will, and it's worthless in a fight), but the power activating causes Odd to stop moving for a while, making him an easy target. Lampshaded when Odd mentions Jérémie erased it accidentally and never bothered reprogramming it because he felt it was useless. It's actually suggested that he is more effective without it.
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    Yumi Ishiyama
Yumi Ishiyama

"Black is my color. Black, like your eye will be if you don't back off!"

Voiced by: Géraldine Frippiat (French), Mirabelle Kirkland (English)

The tallest and oldest of the group. A good student, she is a Japanese national at the boarding school, living off-campus with her family. She is one grade above the rest of the Team, which proves sometimes problematic. While she may have feelings for Ulrich, Yumi is exasperated by his inability to articulate his crush. Her virtual form is a geisha with a collapsible razor-edged fan, with which she can deflect energy bolts. The fan is controlled telekinetically, and can be thrown as a ranged weapon, returning to her hand after an attack. Yumi also exhibits telekinetic power over several objects of the Lyoko landscape — most often boulders in the Mountain or Desert sectors. A running joke among fans is XANA's tendency to single her out for attack.
  • Action Girl: Is proficient in martial arts in real life, and a very capable fighter on Lyoko.
  • Anchored Ship: In Season 3, she tells Ulrich that she's not going to be anything more than Just Friends with him while they're fighting on Lyoko, because the mission is too important to complicate with romance.
  • Bare Your Midriff: All of her everyday clothes include this feature; it seems to be very much in fashion at Kadic.
  • Battle Couple: With Ulrich.
  • Brainy Brunette: She is not as smart as Jérémie or Aelita, but she is still quite intelligent. Whenever Jérémie and Aelita are absent, she usually is the one in charge of using the Supercomputer.
  • Catch Phrase: In the original French...
  • Celibate Heroine: Takes this position in Season 3, after deciding that she doesn't want to complicate her working relationship with Ulrich by allowing romance into the equation, and instead resolves to be Just Friends with him until the Lyoko problem is resolved. It doesn't actually change their situation any.
  • Cool Big Sis
  • Deadpan Snarker: Not as much as Ulrich, but when provoked...
  • Designated Victim: Unlike the other Lyoko-Warriors, Yumi lives with her own family off-campus, making her isolated from them, and as such an easy target for XANA's attacks. One could argue her role as the group's Cool Big Sis and the fact she's the most reluctant to keep fighting might help as well, considering XANA's habits to play with people's minds.
  • Dude Magnet: For a girl supposedly not as remarkable as Sissi, it's amazing how many guys want her. Apart from Ulrich, William, Théo Gauthier, Johnny...
  • Everyone Knows Morse: She and Hiroki learned it to talk in secret at the table.
  • Furo Scene
  • Friendless Background: In "XANA Awakens," she is friendless until meeting Ulrich.
  • Green-Eyed Epiphany
  • He Is Not My Boyfriend:
    • In regards to Ulrich. Yumi has a fairly hilarious scene where she accidentally calls Ulrich her boyfriend in front of Odd and then repeats that Ulrich is her ''friend' as if trying to convince herself of this.
    • She also says this about William, but in this case it is genuine.
  • I Just Want to Be Normal: Out of all the team, she is the one to be the least comfortable with the struggle against XANA, as it forces her to routinely lie to her family (something she hates to do), frequently exposes her to XANA's attacks and generally makes her life more complicated. By the end of the series, she is the only one eager to shut down the Supercomputer and move on.
  • Just Friends: With Ulrich.
  • Mistaken Nationality: Regularly mistaken for Chinese, much to her irritation.
    "I. Am. JAPANESE!!"
  • One Head Taller: Not exactly one head, but she's notably taller than Ulrich. She takes from her mother, obviously, who is also taller than her father.
  • One of the Boys
  • Raven Hair, Ivory Skin
  • "Reason You Suck" Speech: To William in "The Secret".
    Yumi: Because I find your second-rate Casanova act sickening! In the beginning it was pretty nice but now I'm really fed up! So why don't you buzz off and leave me alone?
  • Shorttank /Tomboy: She does have some feminity to her, but she is still significantly more tomboyish than either Aelita or Sissi.
  • Tomboy and Girly Girl: Tomboy to Aelita's and Sissi's Girly Girls.
  • Twice Shy: With Ulrich.
  • Unresolved Sexual Tension: With Ulrich.
  • Will They or Won't They?: With Ulrich.
  • Zettai Ryouiki: Only in the first episode; it's part of the clothes she wears for the school dance.
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    Jérémie Belpois
Jérémie (Jeremy) Belpois

"OK, XANA. What do you have in store for us this time?"

Voiced by: Raphaëlle Lubansu (French), Corey Padnos (English, 2001), Sharon Mann (English, 2004-2007)

Jérémie is the computer genius whom operates the Supercomputer and allows the interface. He's also the leader of the Team, and shows good tactical skills even under pressure. As the most level-headed, he keeps the infighting within the group to a minimum. He can even get a bit authoritarian, despite being the youngest. Jérémie is one year younger than Ulrich and Odd, having skipped a grade. He has more than a crush on Aelita, and it's largely this motivation that keeps the Team going in time after time to shut XANA down. Though he has been virtualized twice, this has never been done on camera — something of a Lampshade Hanging on the second occasion.
  • Adorkable: He is pretty much the archetypal geek, so this is a given. Though this is mostly visible in his relationship with Aelita; he is fairly comfortable with his little group of friends, and doesn't seem to care about what people think of him outside of them.
  • As You Know: Usually the one to deliver exposition.
  • Beta Couple: With Aelita.
  • Crazy Jealous Guy: Displays this in "Saint Valentine's Day", when he gets angry and possessive at the thought of another boy giving Aelita a Valentine's Day present. Odd even calls him out on acting like Aelita's his property.
  • The Dulcinea Effect: As soon as he meets Aelita and sympathizes with her, he becomes obsessed with finding a way to defeat XANA without having to sacrifice her, despite shutting down the Supercomputer with her still inside being the easier way out. Frequently lampshaded by the other Lyoko-Warriors.
  • Everyone Knows Morse
  • Everything Is Online
  • Friendless Background: Prior to turning the computer on, he didn't have any friends. This is one of the reasons why he doesn't want to turn off the SuperComputer in "Echoes": He's afraid his friends will abandon him after it does.
  • Gadgeteer Genius: Practically every upgrade, program or device used by the Lyoko-Warriors is created by him. He also is shown to build a lot of robots as his hobby, and once manages to make a nearly functional EMP bomb.
  • Good Counterpart: Develops into a full-fledged anti-XANA as he gains more experience with the Supercomputer. XANA takes note, since Jérémie seems to be his most hated foe.
  • Hand Behind Head
  • Hypocrite: During the episode "Saint Valentine's Day", he gets jealous over Odd (supposedly) giving Aelita a present and acts like it's not allowed, but later tells Ulrich and Yumi that they shouldn't be upset over the other receiving presents from Sissi/William.
  • In-Series Nickname: "Einstein," "Frankenstein," "Frank-Einstein," "Brainiac" (only in the video game), and on one occasion "Ben Franklin."
  • The Insomniac: Frequently spends entire night working on programs to materialize Aelita or improve the Lyoko-Warriors' equipment. In one episode, Aelita finds out he didn't even realize the night was over.
  • Layman's Terms
  • The Leader: Type 1: Mastermind. He directs everyone from the Supercomputer.
  • Love at First Sight: Towards Aelita.
  • Mad Scientist: He has his moments, especially when he tries to use inventions he picked from Franz Hopper's journal. They tend to backfire.
  • Megane: He wears oval-shaped glasses; aside from looking adorable, they make him look very professional.
  • Mission Control: The resident computer programmer, he's far more useful out of Lyoko.
  • Mr. Exposition: As a computer specialist, he can explain things.
  • Nerd
  • Nerd Glasses: Up to Meganekko levels.
  • Non-Action Guy: Usually, though to be fair, he is much more useful at the Supercomputer than on Lyoko. Subverted in "Ghost Channel" and in "Maiden Voyage", with a little dose of The Greatest Story Never Told. He himself apparently dislikes going on Lyoko.
  • No Social Skills: Implied; it's confirmed he had basically no friend before forming the Lyoko-Warriors (and he only got closer to them because they got involved with Lyoko), and even after he befriended them, his exchanges with them tend to be rather professional and focused on their missions. He gradually gets better as the show goes on, especially after Aelita get materialized. In the final episode, he is reluctant to shut down the Supercomputer because he fears that without Lyoko to keep them together, he will lose the only friends he ever had.
  • Official Couple: With Aelita.
  • Pair the Smart Ones: With Aelita.
  • Playful Hacker: At first. Character Development gradually strips out the "playful" part.
  • Rapid-Fire Typing: Wild Mass Guessing presumes the keyboard on the Lyoko supercomputer has a second Return key in place of the capslock key. That or Jérémie types at a ridiculously high WPM. Or both.
  • Science Hero: He dislikes going on Lyoko, and it's suggested he is a poor fighter anyway. He makes up for it by being the Supercomputer operator and creating most of the upgrades the Lyoko-Warriors use.
  • The Short Guy with Glasses
  • The Smart Guy: He's the only one who knows how the Supercomputer works or how to get to Sector Five or materialize Aelita; the list goes on.
  • Smart People Play Chess
  • Spell My Name with an "S"
  • Team Dad
  • Techno Babble: His exposition bits can turn out like this sometimes.
  • Techno Wizard: See The Smart Guy.
  • Teen Genius: He is the youngest member in the team, yet he can build robots and regularly operate on a nuclear Supercomputer most real people would have troubles even making work.
  • Voice with an Internet Connection: So much so that he now serves as the page image.
  • Wise Beyond His Years
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  • Take Our Word for It: "He was ridiculous..."
  • The Unreveal: Each time he went on Lyoko, it either happened offscreen or had a specific condition that caused him to keep his normal appearance instead of an avatar.

    Aelita Stones
Aelita (Maya) Stones (Lyoko / Hopper / Schaeffer)

"And just forget about my past, you think that's easy? You didn't spend ten years of your life as some sort of computer software!"

Voiced by: Sophie Landresse (French), Sharon Mann (English)

Aelita started out as the Damsel in Distress in the series. Unlike the other characters, she seemed to have originated on Lyoko, and survived there for years. The first season of the show deals with Jérémie and the Team trying to figure out a way to materialize her into the real world. She originally had two special abilities in Lyoko: she could enter the access towers that XANA uses to interface with the real world and shut them down, and she had the ability to morph the virtual landscape around her to create walls, rockslides, etc. Starting with Season 3, she was no longer in danger of being killed if losing all her Life Points. She gained the ability to attack with spheres of energy as well, and obtained wings in Season 4 with her new outfit.
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  • Decoy Getaway: By creating short-lived clones of herself.
  • Deadly Dodging: Her main way of fighting before getting her Energy Fields.
  • Distress Ball: Even after becoming an Action Girl, she always panics whenever the Scyphozoa is involved, and ends up getting possessed. This is particularly frustrating in "Wrong Exposure", where she forgets that she has wings, and thus could escape the Scyphozoa by flying away.
  • Lotus Position: Aelita uses this pose when "listening to XANA's pulsations" in Season 1 (and once in season 4).
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    William Dunbar
William Dunbar

"I'm not the kind of guy who likes to steal the show."

Voiced by: Mathieu Moreau (French), David Gasman (English)

A transfer student exiled to Kadic Academy in Season 2 for spamming love notes. His primary function during the first half of his tenure is to act as a Romantic False Lead for Yumi and lampshade Ulrich's inability to spit it out in the process. William's assistance in foiling several of XANA's schemes on the real-world side proves critical in Season 3, though, and after he confides to the Team that he is starting to dream about elements of his adventures that should have been erased with the Return to the Past, the Lyoko Warriors reluctantly (but unanimously) take him on as their newest member. It goes downhill from there. Mind-controlled by XANA (and stripped of his higher vocabulary in the process), William spends the majority of Season 4 as the Lyoko Warriors' most consistent virtual threat. He gets better, but the show ends two episodes later, and on kind of a harsh note for him.
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This malevolent A.I. is the main antagonist. Created by Franz Hopper to counter "Project Carthage", he rebelled against his creator and was sealed in the Supercomputer some 10 years before the start of the series. His true motivations are unknown, but he is hostile to humanity, and to the Lyoko Warriors in particular. He regularly attacks the real world through the Lyoko Towers. Being a program, he has no definite shape and manifests through the ever-present logo (or Eye of XANA) and the monsters on the Lyoko Sectors. He tries to escape the Supercomputer throughout Season 2 so that the heroes can no longer defeat him by cutting the juice, and after doing so he attempts to conquer the world in Season 4 by creating an army of robots.
  • A.I. is a Crapshoot
  • Arch-Enemy: To the Lyoko Warriors and Franz Hopper. More personally, he seems to really hate Jérémie.
  • The Bad Guy Wins: He partially succeeds in the season 1 finale by preventing Aelita's escape from the Supercomputer. Seasons 2 and 3 end with him fully reaching his goals (respectively escaping the Supercomputer and destroying Lyoko).
  • Big Bad: He is the only villain in the entire series (if one doesn't count Evolution).
  • Card-Carrying Villain: Judging by the song he used to hypnotize all of Kadic in "Killer Music" titled: "Glad When Your Bad".
  • Character Development: Ironically for a never-seen character, he gets lots of it throughout the series. His goals shift along with time according to the situation, his schemes become more complex, and his power increasing allow for varied and subtler tactics. As the series progress, he goes from something in the vein of a Generic Doomsday Villain in season 1 to a skilled Magnificent Bastard by the end of the show.
  • The Chessmaster: Not as much initially, but as the series progresses, he starts developing more complex schemes.
  • The Cracker
  • Crazy-Prepared: The Lyoko Warriors are attempting to destroy his Replikas' supercomputers in order to cut down his resources? He has infected hundreds of them all over the world.
  • Enemy Mine: In "Marabounta" with the Lyoko Warriors.
  • Evil Cannot Comprehend Good: In season 1; due to his intelligence being based on pure logic, he is unable to understand why Jérémie would go into the scanners (something that is stated to terrify the young hacker) to save his friends. However, he is also notable for being one of the few villains to learn from it; in a later season 2 episode, he anticipates Aelita's Heroic Sacrifice and takes advantage of it.
  • Evil Plan: Downplayed. Other than "self-preservation" he doesn't seem to have an over-arching scheme; the trouble he causes in real life during the first season is meant to kill the kids who could shut him down whenever they wanted, which tends to cause a lot of collateral damage. Once Season 2 starts up, however, XANA does end up forming a long-term plan. He intends to subjugate the world via an army of robots, which he can't do while he's restricted to one supercomputer, and kill/disable the Lyoko Warriors since they're the only people who actually know about him. As seen in The Bad Guy Wins above, he comes very close to fulfilling this plan.
  • Faceless Eye: His trademark symbol.
  • He Who Must Not Be Seen: He doesn't even have a body to begin with.
  • Instant A.I., Just Add Water: Justified, Franz made XANA and gave him the ability to evolve, before he learned that XANA was becoming too smart.
  • Leitmotif: "XANA Attack". It gets remixed several times.
  • Manipulative Bastard: Though he has issues understanding emotions, he is still smart enough to develop various schemes based on emotional manipulation. As the series progress, he gradually becomes better at it, eventually going near to the Magnificent Bastard level.
  • Master Computer: Seasons 1-2.
  • Noble Demon: Tend to change a lot Depending on the Writer, but XANA will occasionally display noble behavior:
    • Hinted in "Marabounta"; after teaming up with the Lyoko Warriors against the common threat, they expect him to turn against them, but his monsters instead politely bow to them before retreating without any fight.
    • ... but then has no problem betraying Jérémie in their second team-up in the next episode.
    • Similarly, in "Ultimatum", when he attempts to blackmail the Lyoko Warriors into delivering Aelita to him by taking Odd and Yumi as hostages, he doesn't attempt to kill them until it's clear Jérémie refused, and even shows concern with keeping them alive.
    • Also when XANA possessed Jim and attacked Jérémie in "Final Mix", he merely restrained Jérémie when he quite easily could have killed him. Of course, this was before XANA grew to despise Jérémie.
  • Nothing Is Scarier: Seriously. The heroes are fighting an enemy trying his best to kill them who they never see, who rarely communicates with them. Still, he's obviously there, and it can clearly be terrifying at times. (Although, the few times he does confront them personally, it's even scarier.)
  • Pragmatic Villain: Such as in "Marabounta" where he teams up with the Lyoko Warriors to destroy the title Marabounta, not to save the Lyoko Warriors, but to save himself and Aelita, since XANA needs her memory to escape the Supercomputer. Also shown in "Hot Shower" where he destroys the piece of a comet he was going to use to destroy the factory and the Supercomputer, not out of pity, but because Aelita was devirtualized from Lyoko and he needed Aelita alive and on Lyoko to lure out Franz Hopper.
  • Red and Black and Evil All Over: His symbol is a red eye on a black background.
  • Sealed Evil in a Can: The Supercomputer being the Can. Though it only truly imprisons him when you shut it down; when active, it still prevents him from escaping, but not from wreaking havoc.
  • She's a Man in Japan: Though he doesn't really have a gender, he's referred to by male pronouns in the original French.
  • Sliding Scale of Robot Intelligence: Nobel (to maybe Godlike by Season 4).
  • Soul Jar: His Replikas' supercomputers in season 4 serve as this to him.
  • Stalker Without a Crush: He/She/It follows the main gang, learning vital information about them in order to manipulate their feelings and behavior to his/her/its advantage.
  • Taught by Experience: At first, his attacks were for the most part, random disasters that never really served a greater purpose. Thanks to the fact that he got stronger and smarter from each usage of the Return to the Past, he began to learn from each of his mistakes, becoming a much deadlier manipulator and setting up clear goals for himself.
  • Turned Against His Master
  • Ultimate Evil: Besides the Faceless Eye, we never see a physical form in the real world or even a Lyoko form.
  • Villainous Breakdown: Has one toward the end of Season 1, in the episode "Ghost Channel", where the above quote comes from.
  • The Voiceless: With the exception of the parts in "Ghost Channel" where he impersonate Jérémie and "Franz Hopper" where he seemingly expresses himself through Hopper's clone, we never hear him talking. And even then, it's unclear if it is actually him talking.
  • XANAtos Gambit: Any of his plans involving massive damages or witness can be considered as such: even if the Lyoko Warriors successfully stop his attack, they are forced to use the Return to the Past to erase the event, making XANA stronger in the process.

    Lyoko Monsters
Polite, efficient, deadly.....for the most part.
Lyoko Monsters

The dozen or so models of virtual monsters that XANA uses to defend activated towers and other important locations on Lyoko:

  • Guardians (Gardiens) — Not actually monsters, but force fields designed to trap a victim on Lyoko while XANA confused the heroes with tangentially-related real-world shenanigans. Used twice in Season 1 and shelved afterwards.
  • Roachstersnote  (Kankrelats) — As close to The Goomba as you'll get from XANA, these mollusk-like critters have a basic design: legs, a laser cannon housing, an Eye of XANA on its carapace and little else. They often make up for their lack of individual strength with Zerg Rush tactics; their small size also allow them to hide and act as snipers. The first of two monsters to be fielded in the real world (in "False Start"). Quickly evolved into the Plucky Comic Relief among the monsters with their tendency for being Too Dumb to Live. However, even as late as the third and fourth seasons, they still occasionally devirtualize a Lyoko Warrior, particularly Yumi in one case (having popped out from behind a rock). Notably the only monster to have one and only one attack; they have a basic laser shot, but unlike all other monsters, they don't have some sort of special attack.
  • Hornets (Frelions) — The Airborne Mooks of Lyoko, looking like giant wasps with ten wings. They fly around, shoot lasers from their stingers, drip acid at close range (only in Season One), and make the Lyoko Warriors suffer for not having a dedicated anti-air weapon.
  • Bloks — Walking cubes slightly taller than one of the heroes, supported on six crustacean legs connected to an underslung base. The four side faces are marked with Eyes of XANA on white hemispheres — one is the actual weak point, while the other three fire lasers, ice rays, and rings of fire respectively. The ice rays can paralyze the targets or devirtualize them if they're low on Life Points. The fire rings are the least often used, though both Ulrich and Odd got devirtualized by them in "The Secret". Notably, they seem to be more intelligent than the other monsters; ambushing Lyoko Warriors by using their gripping legs to hide on the sides of cliffs, for example.
  • Krabes — These four-legged, lanky six-eyed beasts deliver powerful laser attacks from both their eye arrays and underbellies. They sometimes also try to skewer the heroes with their pointy legs. Krabes are the first monster type to be deployed en masse ("The Chips Are Down", in which a line of several dozen guards the tower) and the second (and final) type to be deployed on Earth ("A Bad Turn").
  • Megatanks (Mégatanks) — A deathly powerful area denial weapon, these things consist of an arc-laser emitter cocooned within two indestructible shell halves which expand and contract to allow firing, connected by hydraulics and flesh. Their attacks are arguably powerful enough to destroy Towers with enough concentrated fire (as attempted during Aelita's first transfer out of Lyoko in "Code: Earth"), but can be resisted with a couple of the Lyoko Warriors' weapons. They also move very fast by closing their shell and rolling on themselves, not hesitating to crush any unlucky hero in their path. They don't seem to have brakes, though, and often go flying off the Sector if they start to charge.
  • Tarantulas (Tarentules) — XANA's apparent first attempt at min-maxing its monsters: they have more Life Points than any other monster barring the Scyphozoa (as of its Season 2 rollout), the Eye of XANA weak point is small and located at the back of the head, and their mobility is largely sacrificed for high-speed firing of the laser cannon stubs on their arms. Their threat at first was immense, as a single one devirtualized every Lyoko Warrior in one go; later though, the team has learned to deal with them, and they aren't nearly as dangerous.
  • Scyphozoa (la Méduse) — XANA's first Dragon, looking like a levitating giant jellyfish. It eschews direct attacking for wrapping its tentacles around Aelita and attempting to crack her Neuro-Vault open. Other notable targets include Yumi (to force a variant Friend or Idol Decision by making Aelita transfer her own materialization code to replace Yumi's deleted version), William (to make him the new Dragon), and the Skidbladnir (to sabotage its shield regeneration). It normally retreats when it is rendered unable to gain what it came for, only being destroyed once in "The Lake" when it is overloaded, but XANA just makes another.
  • Creepers (Rampants) — Worm-like monstrosities that inhabit Sector 5 exclusively, where they Wall Crawl at will. The unique laser cannon in their mouth is more powerful on average than those of other monsters. Notable for being one of the few enemies that explodes in a large quantity of Ludicrous Gibs.
  • Mantas — White-and-blue manta rays that "swim" through the air and shriek like hawks. As if XANA didn't have enough air superiority, these Giant Flyers hatch from the Celestial Dome surrounding Sector 5 and can deploy practically everywhere to shoot the regular lasers or poop deadly multi-terrain mines. William gains a black one as steed when under XANA's servitude.
  • Kongres — Eel-like monsters that antagonize the heroes in the Digital Sea. Have More Teeth than the Osmond Family.
  • Sharks (Rekins) — Shark-like monsters also native to the Digital Sea. Fire torpedoes instead of lasers.
  • Kalamar — Only seen once in the Digital Sea, it attempted to drill through the Skid's hull.
  • Kolossus (le Kolosse) — XANA's last-minute Giant Mook, appearing as a towering Lava Golem with a blade for a left arm. It foregos standard lasers to crush the Lyoko Warriors and the Skidbladnir with sheer physical power. It is harder to kill than most monsters, having two Eyes of XANA that must be hit simultaneously to destroy it.
  • Video-game monsters — The Volcano Replika and other locales in the Code Lyoko video games give XANA several extra additions to its bestiary, from lanky Insekts to hardy Volcanoids to the first DS game's Final-Exam Boss Scorpion.

  • Artificial Stupidity: The monsters occasionally commit ridiculous mistakes, sometimes even shooting each other. This is lampshaded in "Marabounta", where Odd, while giving instructions to some of the Blocks XANA sent to help them against the Marabounta, mentions that "the only thing stupider than one Blok is two Bloks". In many respects this seems to be due to being somewhat literal-minded and overly obedient. They seem to stick to their given goal or objective even when it's clear that isn't working. For example, when given the task of forming a firing line between the enemy and an activated tower, they do exactly that but seem at a loss for what to do when the line is broken or when the enemy receive vehicle support that make them capable of going over the wall. Or as mentioned below, when ordered to search for and destroy the Lyoko Warriors, they continue to do so even if it prevents them from meeting a much worse fate like falling into the digital sea.
  • Attack Its Weak Point: No matter how much life points they have, it is possible to kill them instantly if you manage to hit the part of their body marked with the Eye of XANA. The only known exceptions to this rule are the Kolossus (who you need to hit on both of his two marks) and the Scyphozoa (who does react and fly away when hit, but doesn't die).
  • Defeat Equals Explosion: They explode upon dying, although the conflagration is unharming to others.
  • Demoted to Extra:
    • The Megatanks got hit with this during Season 4, only appearing in two episodes. This was probably due to their One-Hit Kill lasers being a Story-Breaker Power concerning the Replika plotline, which was displayed in Episode 73, where their firepower was enough that Jeremie had to reroute energy from the supercomputer itself just to make sure that the Skidbladnir wouldn't be instantly destroyed.
    • The Hornets would also suffer from this during Season 4, only appearing in three episodes (79, 81, and 83), and were replaced by the Mantas whenever an aerial monster was needed.
  • Epileptic Flashing Lights: Whenever they're wounded.
  • Frickin' Laser Beams: All monsters, with the exception of the unique ones (Scyphozoa, Kalamar, Kolossus), primarily attack that way. Apart from the Kankrelats, though, they all have unique methods of attack as well.
  • Hit Points
  • Imperial Stormtrooper Marksmanship Academy: They do gets some shot to the heroes, and even sometimes succeeds in devirtualizing them, but most of the time, they miss their target, especially when said target is Aelita.
  • The Juggernaut: The Kolossus.
  • Nice Job Fixing It, Villain!: It has happened for the monsters to keep firing on a hero about to fall in the Digital Sea — thus saving him or her from being stuck by timely devirtualization.
  • Mecha-Mooks: Well, mecha-and-flesh mooks. Or just something completely different- XANA is suprisingly creative in design for an AI program.
  • No Body Left Behind
  • Powers as Programs
  • Robo Cam: They apparently see through the XANA eye, with the exception of Tarantulas, who seem to see through the little red slits on their nose.
  • Sliding Scale of Robot Intelligence: Bricks (except the Scyphozoa). Bloks seem to have some degree of intelligence, curiously enough, as they have been seen glancing at one another and emitting confused noises when a Lyoko Warrior evades them, and ambushing them from unexpected angles.
  • The Speechless: They do not seem to have human intelligence, and do not speak beside shrieking, roaring or other unintelligible sounds.
  • Super Drowning Skills: With the exception of the Kongres, the Sharks and the Kalamar. Justified though, since this is Lyoko, where falling in the Digital Sea equals being disintegrated for them. Landbound monsters can sink in ordinary bodies of water that you can find on the Ice Sector, but as they are designed to work in land, their performance in water tends to be disastrous.
  • Top-Heavy Guy: The Kolossus has short, stubby legs compared to its massive upper body.
  • We Have Reserves: XANA can create as much of them as he wants, so he has no qualm about sacrificing them if necessary.
  • Xtreme Kool Letterz

Will not disrupt household appliances.

Artificial smoke-beings created by XANA through an activated Lyoko Tower to cause havoc on Earth. At first they were only able to take control of inanimate objects or machines, but as XANA gained in power they started taking over animals or even humans. The possessed ones (often labeled as "XANAfied") can be recognized by the XANA symbol in their eyes. The Specters confer them some special powers, like Nigh-Invulnerability (they can still be knocked out if taken by surprise, and are vulnerable to electricity or EMP), Super Strength, Wall Crawl, Shock and Awe... and others as the series progresses. Alternatively they can control many animals or people, but then fewer special powers are gained because XANA's energy is diluted.

    Polymorphic Clones 
Polymorphic Clones

An advanced form of XANA's Specters, the Polymorphic Clones have no need for a host and can take a human shape by themselves. They can copy many appearances, most often of the Lyoko Warriors or some adult to sow division or attack by surprise. They have the same powers as a XANAfied human with the addition of shapeshifting. They solely appeared on Earth, with the exception of one going to Lyoko through a scanner by replacing Odd in the episode "Revelation". Jérémie mastered the technology in Season 4 to create a short-lived clone of himself, and then a replacement for William. Both of Jérémie's clones, however, have a strange programming flaw: their personalities are partially inverted compared to the originals. The Jérémie Clone is an insufferable Odd-like Kid-anova, while the William Clone is dumb as a sack of bricks.

Kadic Academy

    In General 

    Élisabeth "Sissi" Delmas
Élisabeth (Elizabeth) "Sissi" Delmas

"I'm the star, the diva of the school!"

Voiced by: Carole Baillien (French), Jody Forrest (English)

Daughter of Kadic Academy principal Jean-Pierre Delmas. She can have practically any boy at school — but she wants Ulrich, who'd rather have nothing to do with her despite (or maybe because) they'd known each other since childhood. To separate Ulrich from Yumi (not that they're actually together, honest), Sissi makes a variety of attempts to undermine the bonds of friendship between the Lyoko Warriors. These often manifest as attempts to administratively separate them through her power as a one-girl Absurdly Powerful Student Council or the use of blackmail material to buy her way into the group. Either way, she has the potential to sow a greater division than XANA himself. The prequel two-parter "XANA Awakens" reveals that she had initially been in on the Lyoko Warriors' secret, but her memories of the Supercomputer's activation were wiped with a RTTP because she notified her father due to thinking her friends were in danger and a misunderstanding of betrayal occured. Hints dropped from late Season 2 and through Season 4 seem to reinforce Fanon that Sissi could be perfectly content with Odd — so long as she doesn't realize it's a Bohemian like him that she connects with.

    Jim Moralès
Jim Moralès

"Actually, I'd be glad to talk about it, but I don't have the time!"

Voiced by: Frédéric Meaux (French), David Gasman (English)

The Gym teacher and dormitory supervisor at Kadic Academy. A bit overweight and prone to speeches full of redundancies and malapropisms, he's most often the comic relief. But when things get dangerous he can prove extremely courageous and fiercely protective of the children. Jim is sometimes the butt of the students' practical jokes, and as a result can be overly severe toward them. He's very suspicious of Team Lyoko, and ends up discovering the Factory several times, to have his memory erased by the Returns to the Past. Starting with Season 2, whenever appropriate to the situation, his shtick is to mention one of the many jobs or hobbies he's supposed to have done in the past, from sewer worker to astronaut.... Though some of these might be true, most are probably wild exaggerations, as suggested in the episode named for his Catch Phrase.

    Hiroki Ishiyama
The only Annoying Younger Sibling so far.
Hiroki Ishiyama

"YUUUUMIII, your boyfriend is here!"

Voiced by: Guylaine Gibert (French), Barbara Weber-Scaff (English)

Yumi's younger brother, appearing in Season 2 and joining the 6th grade at Kadic at the start of Season 3. He shows some hero-worship toward Ulrich, and constantly hounds his sister to date the Stern boy and admit her feelings for him. A bit of a crook, he often blackmails Yumi into doing his homework in exchange for not tattling to their parents when she's out saving the world. Unwittingly tagging along in some of XANA's attacks, he tends to be a dangerous distraction (in "A Bad Turn"), but also shows some useful skills (like picking locks in "Hot Shower"). He never keeps memories of this thanks to the Returns to the Past.
  • Annoying Younger Sibling: His sole role seems to be teasing Yumi about her relationship with Ulrich. To say she finds this annoying would be an understatement.
  • Bratty Half-Pint
  • Everyone Knows Morse: He does have an excuse for this, though; he and Yumi learned it to talk in secret at the table.
  • Remember the New Guy: Hiroki is nowhere to be seen in season 1, even though we see the Ishiyama household a few times. Even in "Holiday in the Fog", when the family are going on vacation, Hiroki isn't seen in the car. Yet when he shows up in season 2, no-one draws attention to his sudden appearance.
  • Shipper on Deck: Of his sister and Ulrich, though it's mostly about teasing her.
  • Tagalong Kid
  • Young Entrepreneur

    Franz Hopper
Franz Hopper / Waldo Schaeffer

"Project Carthage was military program used to block enemy communication. [...] So I built the Supercomputer, created Lyoko, and last of all XANA, to destroy Carthage."

Voiced by: Arnaud Léonard (French), Paul Bandey (English, second season), Alan Wenger (English, third and fourth seasons)

Aelita's father, the creator of the Supercomputer, Lyoko and XANA. Also a former Science teacher at Kadic Academy.
  • Badass Bookworm: He rarely manifest in person, but when he does, it almost always result in him doing something awesome to help the Lyoko Warriors. XANA considered him enough of a threat to miss a chance to destroy the Supercomputer and Lyoko Warriors for good if that meant not being able to deal with him.
  • Ball of Light Transformation: Unlike other, rather than taking the form of a humanoid Digital Avatar, Franz Hopper is permanently virtualized on Lyoko under the shape of a brilliant ball of light.
  • Big Good
  • Color-Coded Characters: White.
  • Heroic Sacrifice: Allows himself to be killed by Mantas while he diverts enough power to the Supercomputer to launch the Anti-XANA Program.
  • Knight of Cerebus: Make no mistake, he's most certainly the Big Good, but episodes that directly involve him (In particular, his past concerning Project Carthage and the Men in Black) tend to delve into darker plot lines than normal.
  • The Mentor: He serves this function to Jérémie, helping him to refine his programming and giving him data and better weapons with which to fight XANA.
  • Opaque Nerd Glasses
  • Papa Wolf: XANA knows it.
  • Phlebotinum Rebel: Franz Hopper created XANA to destroy "Project Carthage", which he was previously working on.
  • The Professor
  • Properly Paranoid: He suspected agents were following him while he was working on the Supercomputer. He was right.
  • Real Name as an Alias: Waldo Schaefer, a.k.a. Franz Hopper, changed his monicker for his middle name and the maiden name of his wife.
  • Staying Alive: In three season finales, he sacrifices himself for Aelita. The third time seems definitive.
  • Transhuman Aliens: Hopper is permanently virtualized into Lyoko, and his avatar is a brilliant ball of light, rather than a humanoid like the other Lyoko Warriors.
  • Mad Scientist: He built the Supercomputer, Lyoko and XANA on his own.
  • Virtual Ghost: Franz never bothered taking a corporeal form on Lyoko.
  • The Voiceless: While his voice is heard on screen, it's always either in a flashback, a recording, or a XANA trick. Hopper himself (in light ball form) is never heard to speak.

    William's Clone
Clone William. Awwwwwww!
William's Clone

"To be specific, I'm a digitally-generated random polymorphic energy field controlled by a basic non-evolving behavioral program."

Voiced by: Mathieu Moreau (French), David Gasman (English)

A Polymorphic Clone created by Jérémie to replace William throughout season 4 while the latter is controlled by XANA, so that nobody at Kadic gets suspicious from his prolonged absence. The clone is close enough from the original to fool most people, although his programming isn't quite perfect, making him a Literal-Minded Ditz — and a big source of humor. Milly and Tamiya discovers something is amiss in episode "A Lack of Goodwill", and William's Parents quickly find out he's an impostor (in episode "Down to Earth"), just before William's return.
  • Artificial Human
  • Cannot Tell a Lie: He was never programmed to lie. He'd respond truthfully to any question asked by anybody, including about his true nature — although being quite stupid and literal-minded, it's probable he'd misinterpret the question. And while he's aware another William exists, he still responds to William's name, which can cause further confusion.
  • Cloning Blues: Averted. He's not self-aware enough to care that he's just a replacement doomed to disappear when the true William comes back.
  • The Ditz: His artificial intelligence isn't quite advanced enough to make him act normal.
  • Doppelgänger
  • Hard Light
  • Literal-Minded: The most common expression of his ditziness:
    Delmas: Well, Dunbar, my boy, I am glad to see your fever has broken and you're feeling well!
    Clone William: Eh... did I break anything else?
  • Other Me Annoys Me: If the possessed William looks annoyed at the sight of his clone, it's nothing compared to what the real one discovers it did to his reputation when he's finally free.
  • Replacement Goldfish: He tends to exemplify the "Goldfish" part more than the "Replacement" part.
  • Techno Babble: The above quote.
  • Undying Loyalty: To the Lyoko Warriors, so long as XANA can't control him. He even goes so far as to try to fight the real William in one episode (not with much success, unfortunately).


Odd's dog, which he brought secretly in Kadic and now hides inside his room with the help of Ulrich, since pets are forbidden at school. Kiwi tends to not do much besides eating, sleeping and in some occasion wreaking havoc in the room. Odd, however, is devoted to it.
  • Dogs Are Dumb: If Jérémie's opinion is anything to go by.
  • Loophole Abuse: Used in one episode, where Jim finds out about Kiwi. When pointed out that pets are forbidden inside school, Odd notices that they are in the bus at this point, meaning they are technically outside school.
  • Open Secret: Pretty much every student at the school knows that Odd is keeping him in his room in defiance of the rules; Sissy even threatened to tell on him in one episode, but apparently changed her mind later.
  • Ridiculously Cute Critter
  • Robot Me: Kiwi has a robot duplicate built by Jérémie.
  • Team Pet: To the Lyoko Warriors.