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The Lyoko Warriors
- 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: Traditional animation in the real world, CGI-rendered 3D models in Lyoko. In Evolution, live action gets thrown into the mix.
- 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.
"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: He's been deeply in denial about his feelings towards Yumi since the beginning. This stops immediately when William becomes a legitimate competitor for Yumi's affections.
- 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.
- Attack Reflector: His katana can be used to deflect the Monsters' laser.
- Badass Biker: From Season 2 onwards, thanks to the Overbike.
- Calling Your Attacks: Less so than Odd, but he will occasionally shout "Impact" when hitting a monster or "Triplicate/Triangulate" when using his power.
- Car Fu: With the Overbike.
- Doppelgänger Attack: "Triplicate" allow him to generate two duplicates of himself. In the first season they only act as decoys to distract enemies, but Season 2 has him using them as allies that can attack of their own.
- Doppelgänger Spin: "Triangulate" allows him to essentially combine his Super-Sprint and Triplicate, causing him to move at Super-Speed around the opponent in a triangle-like pattern, with the three Ulrich appearing at each angle.
- Everything's Better with Samurai: There's no real reason for him to be a samurai in Lyoko. He's not even Japanese. But damn, it sure is cool.
- Fingerless Gloves
- Hit Points
- Katanas Are Just Better: Literally, as his weapon is easily the most effective against most monsters.
- Lightning Bruiser: His katana is an efficient weapon both to deflect attacks and inflict heavy damages, while his Super Sprint power makes him the fastest of the group.
- Le Parkour: A side effect of Super Sprint.
- Me's a Crowd: His Triplicate ability, which allows him to make two copies of himself.
- Samurai: His avatar's design is based on a samurai.
- Speed Echoes: His Triangulate ability allows him to create these. What's more, they're not just afterimages; they're actual copies.
- Super Speed: "Super Sprint!"
- Throwing Your Sword Always Works: He's got a better track record throwing his sword than Odd does shooting his arrows.
- Weapon of Choice: Katana.
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: Nothing changes Odd's goofy demeanor, not even being faced with certain death.
- 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.
- Insistent Terminology: "I'm not scrawny, I'm svelte."
- Is It Something You Eat?: Being a Big Eater with a very limited vocabulary, this comes up a lot.
- 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. To a lesser extent, he's this way with Jérémie and Aelita's relationship as well.
- 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.
- Alice Allusion: Unintended, but it's undeniable that he's got the whole "Cheshire Cat" thing going.
- Arch-Enemy: The Megatanks. Lampshaded in the first episode.
- Arm Cannon: Lazer Arrows.
- Aside Glance
- Brought Down to Badass: Even after Jérémie erased his Future Flash power, he is still very competent. Of course, the fact his power wasn't of much use to begin with does help.
- Cat Boy: His Lyoko avatar gives him a set of cat ears and a tail. He also runs on all fours quite frequently.
- Chest Insignia: Of Kiwi peeing. Even he doesn't get why Lyoko did that.
- Deflector Shield: Since Season 2 (and in the prequel as a minor continuity goof).
- Facial Markings: Like Aelita, he has markings above his eyes.
- Four-Fingered Hands: He loses a finger when he goes into Lyoko, ikely because he becomes a Cat Boy
- 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.
- Hover Board: His Overboard in Season 2.
- 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!
- Le Parkour: The undisputed master of it, even beating out Ulrich.
- Running on All Fours: He gains the ability to run faster on all fours in Lyoko.
- Psychic Powers: Future Flash gives him brief glimpses into the future. He loses the ability in Season 2.
- Super Reflexes: Cat-like reflexes, essentially. He may not be very tough, but he's damn near impossible to hit.
- Taking the Bullet: This is usually how he gets dematerialized, mostly because he's so agile that it's hard to hit him unless he wants to be hit.
- Wall Crawl: Using his claws like a cat climbing a tree.
- 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.
"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...
- "Banane !" ("Dork!")
- "Sympa, l'accueil. Très sympa." ("Nice welcome. Very nice.")
- 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: She's closer in age to the rest of the group than most examples, but she's mature enough to fit the mold pretty well.
- 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: Chances are pretty good that you'll catch Yumi in the bathtub in any given episode.
- Friendless Background: In "XANA Awakens," she is friendless until meeting Ulrich.
- Green-Eyed Epiphany: She does a pretty decent job of pretending she's not into Ulrich, until someone (usually Sissi) starts flirting with him.
- 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: She's the only girl in her group of friends (except Aelita, who's a computer program for most of the show). She also avoids traditionally "girly" pasttimes, preferring soccer, track and field, and martial arts.
- Raven Hair, Ivory Skin: The palest of her friends, with very black hair to match.
- "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.
- Boomerang Comeback: A favored trick of hers to take out monsters with her throwing fans.
- Combat Hand Fan: Her weapon of choice. One in season 1, two from season 2 onward.
- Everything's Better with Spinning: Geisha Tornado.
- Geisha: Her outfit form seems to be at least partially based on one, altered to fit that of an Action Girl.
- Giant Waist Ribbon: Part of the geisha-looking outfit; she uses the big knot to store her Combat Hand Fan.
- Jack-of-All-Stats: Not quite as agile as Odd, effective in close combat as Ulrich or adept at manipulating the environment as Aelita, but able to perform well in all three areas.
- Mind over Matter: Her main power.
- Le Parkour: To great effect when she combines her psychic powers with her acrobatics.
- Precision-Guided Boomerang: Her tessen fans can be thrown and always return to her.
- Pstandard Psychic Pstance: She sometimes makes this gesture when using her Telekinesis. More so in Season 4.
- Psychic Powers: Telekinesis.
- She-Fu: She takes a far more graceful and gymnastic approach to fighting enemies than Ulrich and Odd.
- Three-Point Landing: Following some of her acrobatics, including sometimes when just virtualized.
- Weapon of Choice: Tessen Fan.
- Fingerless Gloves
- Fashionable Asymmetry: A shorter sleeve on one side, a buckler-like bracer, one stocking different from the other, and sakura petals on her thigh.
- Hard Light: When "translated" on Earth.
- Gratuitous Ninja: Her upgraded costume makes her look more like a ninja than the previous geisha.
- Sensual Spandex: Like all S4 avatars, this one outfit nicely shows her virtual curves.
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.
- Cybernetics Will Eat Your Soul: During Episode 38, he deliberately repeated Returns to the Past so he could utilize a special neuronal headset to increase his intelligence. However, this ended up hurting him mentally and physically, as he became increasingly irritable and was prone to fainting spells while under the device's influence. To add insult to injury, he actually wasn't getting smarter at all, and at the end of the episode, he destroys the headset.
- 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: He uses Morse Code to communicate with the others in Skidblandir. Though, given how Crazy-Prepared he is most of the time, he probably taught it to the others to use in case of an emergency.
- Everything Is Online: He can use the supercomputer to do a bunch of things that he really shouldn't be able to do. This is the only real explanation.
- 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: His standard pose when he's not hunched over the supercomputer's keyboard.
- 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: Often has to repeat himself in simpler terms, because he forgets that everyone else isn't a super-genius.
- 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: A completely textbook example.
- 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: He's not particularly short, but Yumi, Ulrich, and Odd's hair are all taller than he is. He and Aelita are about the same height.
- 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: He's seen playing with Ulrich in a couple of episodes.
- Spell My Name with an "S": Either Jérémie or the anglicized Jeremy. The former is the official spelling.
- Team Dad: A Bumbling Team Dad, but a Team Dad nonetheless. He's the only one who comes close to Yumi in terms of maturity, even if he does get a little carried away sometimes.
- 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: Despite his general lack of common sense, he does show a surprising amount of insight.
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.
- Action Girl: Initially not, but she start developing traits of it in season 2 and fully becomes one starting with season 3.
- Bad Dreams: In Mister Puck. They end up being the key to finding Franz Hopper's diary.
- Benevolent A.I.: Subverted; the others initially assume she is one, but it's later revealed she's human to begin with.
- Beta Couple: With Jérémie.
- Break the Cutie: Poor girl just can't catch a break. Aside from the various times where Jeremy almost found a way to materialize her only to fail at the last minute, season 2 ends with The Reveal she wasn't really an Artificial Human, but a real girl whose memory was accidentally erased. It gets so bad she actually ends up trying to kill herself.
- Can't Live Without You: In season 2, XANA manages to ensure that, even if she is outside Lyoko, shutting down the Supercomputer will still result in her death.
- Character Development: Lots, to the point that she's arguably the show's central protagonist.
- The Chick: Especially in the first couple of Seasons, when she had no way of defending herself. Even after she becomes more competent, she remains the team's emotional center.
- Damsel in Distress: She plays this entirely straight in season 1 (no weapon other than Creativity, and dies if she loses all her life points), almost to the point of being a Damsel Scrappy. She gets a bit better in season 2, but still finds herself depending upon the other three most of the time. By season 3 she's upgraded to Action Girl status.
- Designated Victim: Very justified, since she is the key to stop XANA from attacking Earth. As such, it's only natural for XANA to focus on her.
- Disney Deaths: Happen several times.
- Dreaming of Things to Come
- Driven to Suicide: At the end of season 2, she tries to commit a Heroic Sacrifice by shutting down the Supercomputer. Jeremy manages to save her just in time.
- Everything's Better with Princesses: She isn't really a princess, but Odd likes to call her one.
- Fetal Position Rebirth: When she's finally de-virtualized, she emerges like this.
- Give Geeks a Chance: Jérémie being a geek clearly never was a problem to her.
- Human Popsicle: Although not through cryonics — she didn't age for 10 years while virtualized inside the Supercomputer.
- Hidden Buxom: Appears to be surprisingly well-endowed those few times she isn't dressed in heavy, baggy clothing.
- I Have Many Names: She only has one real name, but has to rely on various fake names in the series. Her current alias is Aelita Stones.
- In-Series Nickname: "Princess"
- Kiss Me, I'm Virtual: Aelita is an A.I. stuck in the virtual world. This doesn't stop Jérémie from falling for her and doing everything he could to materialize her on Earth. Subverted when it is discovered she's in fact human.
- Laser-Guided Amnesia: The reason she started out believing she was just an A.I. She gets her memory back at the end of season 2.
- Little Miss Snarker: Full-fledged in Seasons 3-4, but there was some present before then.
- The Load: Especially in Season 1. Grows out of it throughout Season 2, and definitely no longer by Season 3.
- Mad Scientist's Beautiful Daughter: She's actually Franz Hopper's daughter.
- Magical Girlfriend: To Jérémie.
- Magic Skirt: Justified, since she's in a virtual world where skirts aren't necessarily made of fabric.
- Martyr Without a Cause: Aelita is often a bit too eager to sacrifice herself in Seasons 1 and 2. Sadly justified in that it would end XANA's menace once for all. XANA even tries to take advantage of this in "Missing Link": he uses the Scyphozoa to steal Yumi's DNA sequence code because he knows that Aelita will transfer hers over to Yumi (stating that "Yumi's place is on Earth"). This leaves Aelita's memory exposed for him to take at will.
- Meaningful Name: Her name may be a reference to the titular character of the novel by Aleksey Tolstoy, who was also a prominent figure of another world and had a relationship with a lonely scientist.
- Missing Mom: Her mother is seen in flashback and has been named by Word of God as Anthea, but was kidnapped for unknown reasons by the MiB. It has still yet to be revealed what she has become.
- No Social Skills: At first in Season 2, she has little to no idea how the real world works.
- Official Couple: With Jérémie.
- Older Than They Look: Aelita is chronologically 23-24, but ten of those years were spent asleep in Lyoko (and another full year in avatar form), so she looks, acts, and biologically is 12-13. Finally confirmed in "Wrong Exposure", where Jérémie takes advantage on it to prevent Delmas from figuring out her relation to Franz Hopper.
- Pair the Smart Ones: With Jérémie.
- Pet the Dog: In the penultimate episode, she's the only Lyoko Warrior who sympathizes with William after he's been freed from XANA, and is willing to stick up for him when the others reject him. It doesn't have any payoff since XANA later possesses William one final time and she ends up focusing more on her father, but it's the thought that counts.
- Pink Means Feminine: The girliest of the group by far, and has an overwhelmingly pink color scheme.
- Plucky Girl: You'd be surprised that someone this cheery and energetic was trapped in a supercomputer and hounded by an evil program for 10 years.
- Rose-Haired Sweetie: She fits about all the traits associated with this. She's a sweet and good-natured girl most of the time and while her love interest, Jérémie, doesn't have blue hair, he is associated with the color blue.
- Sealed Good in a Can: Season 1.
- Single Woman Seeks Good Man: The reason she fell for Jérémie was because of his persistence in helping and trying to make her happy without seeking thanks or reward.
- Smart People Play Chess: She's Jérémie intellectual equal, and often plays him in chess.
- Teen Genius: She rivals Jérémie in that area, though it's unclear how much is natural and how much comes from her spending years as a program.
- Tomboy and Girly Girl: Girly Girl to Yumi's Tomboy.
- Took a Level in Badass: In season 1, Aelita required Odd, Ulrich and Yumi as bodyguards, and her only use is deactivating towers. Out of all 26 episodes of season 1, she only destroys one monster. By season 4, she's the most capable Lyoko Warrior of all — not only does she have Energy Fields, which are more powerful than any other Lyoko weapon, she also has wings for flight. It's also worth noting that XANA-possessed Aelita has only ever been defeated once....
- Undead Tax Exemption: Averted. The Lyoko Warriors have to do the work to create an identity for her (though Jérémie is very good at "arranging" her paperwork), and there are enough holes in it for Sissi to occasionally piece together that something's going on.
- Why Did It Have to Be Snakes?: Twice...
- Why Did It Have to Be Wolves?: They feature heavily in her recurring nightmares.
- Why Did It Have to Be the Scyphozoa?: She really catches the Distress Ball whenever it pops in, even in later seasons when she's the most powerful member of the group.
- Calling Your Attacks: When she gets the ability to use Energy Fields, she does this.
- 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.
- Energy Ball: Her sole offensive ability, which she gets in Seasons 3-4.
- Facial Markings: A red line on either cheek in her Season 1-3 avatar. They're gone in Season 4.
- Hypnotize the Princess: Whenever the Scyphozoa get ahold of her, this is the inevitable result.
- Lotus Position: Aelita uses this pose when "listening to XANA's pulsations" in Season 1 (and once in season 4).
- Neuro-Vault: Her memories, which Xana tries to siphon out of her brain.
- One-Woman Wail: How she invokes her Creativity power.
- Override Command: Code: LYOKO
- Pointy Ears: Especially in Season 4.
- Psychic Powers: Creativity, which telekinetically reshapes the environment, and Second Sight, which gives her omnipresent awareness of everything in Lyoko.
- Reality Warper: Though a rather limited version; she can only manipulate Lyoko's territory.
- Support Party Member: Seasons 1-2. She can't fight, but she's the only person who can deactivate the towers. Her Second Sight is also extremely helpful to the party.
- The Captain: Of the Skidbladnir.
- Fingerless Gloves
- Flight: A new power she gains, thanks to a pair of energy wings.
- Hard Light: When "translated" on Earth.
- Power Gives You Wings: Aelita's upgrade came with a pair of "Angel Wings" integrated into her suit.
- Sensual Spandex
- Skirt over Slacks: A translucent, plastic-like skirt.
- Winged Humanoid: When she uses her Angel Wings.
"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.
- The Atoner: Subverted; he attempts to be this in season 4 finale, but is rejected by the Lyoko Warriors. Played straight in Code Lyoko: Evolution.
- Chekhov's Gunman: He starts off as a minor character and a Romantic False Lead for Yumi before becoming the Sixth Ranger to the Lyoko Warriors. And then becoming The Dragon for the remainder of Season 4.
- The Determinator: He never gives up on seducing Yumi, even after all that happened by the end of the show.
- Flashback Nightmare: William has dreams about things that should have been erased with the Return to the Past — one of the factors that led to his becoming a Lyoko Warrior.
- Heel–Face Door-Slam: Sadly, after freeing him, all Lyoko Warriors but Aelita have difficulties forgiving him for what he did under XANA's control (despite Aelita pointing out it wasn't his fault and it could have happened to any of them). It goes as far as when he attempts to redeem himself by helping them, Yumi violently rejects him and refuses he'd come on Lyoko, arguing XANA might seize the opportunity to control him again. Ironically, this is exactly what happens... except XANA is able to control him through a tower because he is still on Earth. Nice job, Yumi!
- Leeroy Jenkins: This is what causes him to end up possessed by XANA, he got too caught up in battling XANA's monsters, and thought he could take on the Scyphozoa...Quite simply put, he couldn't.
- Love Makes You Crazy: "Makes me totally insane."
- Mr. Fanservice: Completely intentional on his part.
- New Transfer Student: He got expelled from his old school for spamming love notes.
- Promotion to Opening Titles: When he becomes a villain.
- Reformed, but Rejected: In the finale. He isn't present when the supercomputer is shut down, but he seems to have at least managed to return to being on civil terms with Yumi.
- Romantic False Lead: To Yumi. In his first appearance, she seems to give back some of his feelings, but she gets annoyed by his Stalker with a Crush attitude as the show goes on. By season 3, it's made quite clear he never had any chance with her to begin with.
- Sixth Ranger: Joins the Lyoko Warriors at the end of Season 3...
- Sixth Ranger Traitor: ...only to be possessed by XANA on his first mission and ends up as The Dragon for Season 4.
- Stalker with a Crush: His approach to Yumi gives off this vibe. He's harmless, but annoyingly persistent.
- All Your Powers Combined: His Super Smoke power allows him to move as fast as Ulrich, fly like Aelita and can be used the same way as Yumi's telekinesis. Plus, he possess a hand-to-hand weapon that can shoot Razor Wind, and a buckler-like bracer to deflect and return attacks.
- Battle Cry: "FOR XANA!"
- Brainwashed and Crazy: XANA's possession makes him more than a little unhinged.
- Cool Sword: He uses a Final Fantasy-style Buster Sword.
- The Dragon: To XANA.
- Evil Costume Switch: After being possessed.
- Facial Markings: An Eye of XANA on the forehead.
- Fetal Position Rebirth: At the end of Season 3, XANA resurrects him after Lyoko is destroyed.
- Fingerless Gloves
- Hard Light: When "translated" on Earth.
- Hulk Speak: His usual speech when under XANA, though he does have actual sentences occasionally.
- Hyde Plays Jekyll: Does it twice to trick Aelita, with remarkably successful results.
- Mark of the Beast: The Eye of XANA.
- Nonchalant Dodge: Using his Super Smoke, he's a master of this.
- Power Floats: While XANA is controlling him, he has the ability to levitate.
- Psychic Powers: Telekinesis, Far Sight.
- Sensual Spandex: Much more so in Season 4, in an inversion of Evil Is Sexy.
- Super Smoke: Trope Namer.
- Sword Beam / Razor Wind: Can fire these out of his Zweihander
- Sword Drag: Though, if you had a sword that big, you'd probably drag it as well.
- Theme Music Power-Up: Whenever XANA's theme starts playing, you know he's about to kick some serious ass.
- Took a Level in Badass / Took a Level in Jerkass: Oddly enough, his fanbase got much bigger after this. Granted, he went from an annoying rival to Ulrich to a badass villain, so that might be actually understandable.
- Voice of the Legion: As is standard with XANA possessions, he has his own voice accompanied by a demonic echo.
- Weapon of Choice: BFS.
XANA (X.A.N.A.)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: XANA started off as a relatively simple AI, but gradually became more intelligent and malicious as time went on.
- 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: He has access to any computer network in the world and can manipulate electricity.
- 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: He's been trying to kill his creator for the better part of 10 years.
- 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 MonstersThe 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: Unlike the Lyoko Warriors, who all have 100 Lifepoints, the monsters all have varying amounts. Tarantulas have the most, while Kankrelats have the least.
- 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: They explode when killed and don't even leave a trace.
- Powers as Programs: Justified, since they literally are programs. XANA is able to manipulate them exactly in that fashion: downloading them, modifying them, copying them, etc.
- 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: Most of their names are normal words in French and English, just modified with these to make them look cool. Kankrelat, for example, is just the French word for "cockroach," except with all of the "Cs" replaced with "Ks".
SpectersArtificial 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.
- Body Snatcher
- Glamour Failure
- Hulk Speak: Sometimes; some of them have been shown to be perfectly able to deliver real sentences. Most often, it just seems like XANA doesn't feel like wasting time to make them talk, only doing so if it is deemed necessary.
- Intangible Man
- Mind-Control Eyes
- Robo Cam
- Shock and Awe
- Sliding Scale of Robot Intelligence: Monkey to Average-Joe.
- Speed Echoes
- Super Strength
- Voice of the Legion
- Walk on Water
- Wall Crawl
- Wetware Body
Polymorphic ClonesAn 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.
- Artificial Human
- Characterization Marches On: The prototype Clone in season 1 couldn't shapeshift and was rather terrible at impersonating Yumi, blowing its cover rather quickly. By season 2, XANA seems to have perfected them, and they are more than capable to fool not only the civilians, but also sometimes the Lyoko-Warrios themselves.
- Glamour Failure
- Foreshadowing: The Polymorphic Clones technically didn't appear until season 2, but season 1 had an episode where XANA did try something of a prototype by sending a Specter assuming the appearance of Yumi on Earth while the real Yumi was kept inside a Guardian.
- Hard Light
- Hellish Pupils
- Hulk Speak: Averted; most Polymorphic Clones that have been seen can articulate perfect sentences if needed, and just growl while fighting.
- Intangible Man
- Kiss Me, I'm Virtual
- Robo Cam
- Shock and Awe
- Sliding Scale of Robot Intelligence: Average-Joe (though William's is more of a Monkey).
- Speed Echoes
- Spot the Imposter
- Super Smoke
- Super Strength
- Voice of the Legion
- Voluntary Shapeshifting
- Adults Are Useless: Usually played straight, but adverted with Jim, who occasionally helps a lot (the season 1 finale being the best example), and Franz Hopper, whose position as the Big Good ensure him being useful.
- Boarding School
- Junior High
- Meaningful Name: "Kadic", for sci-fi author Philip K. Dick, who was the physical inspiration for Franz Hopper.
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.
- Abhorrent Admirer: A toned-down example toward Ulrich; unlike the usual, he doesn't reject her because she is ugly (she is actually quite attractive), but because he feels she is a Brainless Beauty and an extremely annoying Stalker with a Crush.
- Absurdly Powerful Student Council: A one-person version, solely by virtue of being the principal's daughter.
- Action Survivor: Just try to count the numerous XANA attacks she was directly involved in that she survived.
- Alpha Bitch: Though becomes a Lovable Alpha Bitch through Character Development.
- Bare Your Midriff: She wears a belly-shirt everywhere.
- Bathing Beauty: She is said to take up to three showers a day, and she spends lots of time in them.
- Big Sister Instinct: As often as she picks on them, Sissi is actually very protective of Milly and Tamiya during XANA's attacks. "Attack of the Zombies" makes a point of this.
- Brainless Beauty: Or so she comes across; she's actually smarter than she seems.
- Bratty Teenage Daughter: To Principal Delmas. The poor man is just a little too good-natured to really do anything about it.
- Butt Monkey: She has awful luck, and everyone seems to dislike her to some extent. But she mostly brings it on herself.
- Catch Phrase: "Cretin(s)!"
- Character Development: Becomes a progressively better person throughout seasons 1, 2, and 4 (not so much season 3.)
- Characterization Marches On: In many of the earlier Season 1 episodes scripted (though aired out of order), she was very malicious and more effective in her manipulation and antagonism. But then the writers decided to soften her, and she became the bumbling comedic ditz that we're all familiar with.
- Clingy Jealous Girl: Where Ulrich is concerned. It annoys the hell out of him, since they're not together and it gives people the wrong idea.
- Defrosting Ice Queen: She's way more openly antagonistic to the main group in Season 1. Come Season 2, she's warmed up to them quite a bit.
- Demoted to Extra: In Season 3 and 4, especially 3 (she becomes relevant again late into Season 4).
- Depending on the Writer: The level of sympathy her character is treated with changes from episode to episode; shown moreso in Seasons 2 and 4 (where she was sympathetic in the majority of her appearances) than 1 and 3 (where she... wasn't, though she did have moments in 1.)
- Determinator: Her level of commitment is either admirable or frightening.
- Do Not Call Me "Paul": "It's Sissi! Not Élisabeth!"
- Dungeonmaster's Girlfriend: She ends up playing this role whenever she joins the party, even though she's not romantically involved with any of them.
- Friendly Enemies: She and the gang are mostly very civil and casual with each other throughout Season 4. It only stops (temporarily) toward the end when her old suspicions consume her again.
- Green-Eyed Monster: She's insanely jealous of Yumi due to Ulrich's crush on her and her general status as The Ace.
- Hair Decorations: Her headband.
- Hidden Depths: More and more episodes show this as the show goes on, particularly how surprisingly selfless she can be during XANA attacks, very often helping other people even at risk to herself. Even the misunderstanding that got her kicked out of the Lyoko gang was based upon frantic concern for their wellbeing.
- Hopeless Suitor: Even before Yumi entered the scene, it was clear Ulrich had no interest in dating her.
- Hormone-Addled Teenager: She's a little too amorous for her age, even.
- Informed Attribute: Stated by Ulrich to be a Dude Magnet in the prequel; however, the number of boys seen actually hitting on her onscreen doesn't exceed three (Two of them being Odd and Hervé, and the third being a one-shot character who forgot about her as soon as he saw Yumi), and minor characters have been shown to be pretty aware of her being a Brainless Beauty. In fact, Yumi technically got more attention from boys than she did.
- It's All About Me: Her usual attitude, though see Hidden Depths above.
- Jerk with a Heart of Gold: She's a bratty, self-absorbed snob, but she's a decent person deep down. And she does genuinely care for Ulrich, even if she has a funny way of showing it.
- Little Miss Snarker: She can't say two sentences without something snarky coming out.
- Lingerie Scene: She's in her underwear about as often as Yumi is in the bathtub.
- The Load: Sometimes, but sometimes not; it all depends on the situation.
- Lovable Alpha Bitch: Post-Character Development.
- Love Dodecahedron: At least three sides of it.
- Malaproper: Frequently, one of the many signs that she's not very bright.
- Missing Mom: Word of God states that Sissi's mother is alive, but lives away from Sissi and her father. She is never seen or mentioned in the show.
- Ms. Fanservice: When she's not in a Lingerie Scene, she's dressed to play this to the hilt.
- Only Known by Her Nickname: Only adults ever call her "Élisabeth", and she hates that. Everybody else calls her "Sissi".
- Out of Focus: From Season 3 up until near the end of Season 4 (when the gang's suspicious activities increases to such a level that she can't ignore it anymore).
- Screaming Woman: Played straight when she's confronted to XANA's latest attack. Parodied in "End of Take", where "AAAAAHH" is her sole line in James Finson's movie.
- Ship Tease: With Odd, particularly in Season 2's "Déjà Vu" and Season 4's "Kadic Bombshell" and "Bad Connection".
- Skirt over Slacks: In Seasons 1-3 this is her standard outfit.
- Spoiled Brat: Her father is a huge pushover where she's concerned, which she takes advantage of mercilessly.
- Stalker with a Crush: Her crush on Ulrich tends to verge on this, as in some episodes she is willing to resort to things like blackmail and taking advantage on his Laser-Guided Amnesia to get him to date her. The fact she has apparently been trying to seduce him since Nursery School, even though he never returned the affection, doesn't help. This tends to be toned down after her Character Development.
- Throw the Dog a Bone: On occasion, and in the final episode, when the gang at last decides to make her an "official" friend. Also counts as Earn Your Happy Ending, as it feels like an ultimate reward for all the multiple times she's helped out but doesn't remember.
- Tomboy and Girly Girl: A rival (sort of) case with Yumi.
- Unknown Rival: Yumi is mature enough to realize that Sissi is a Hopeless Suitor, and thus a rivalry between them is barely acknowledged on her part.
- Unlucky Childhood Friend: She knows Ulrich and has a crush on him since Nursery School. Though the "friend" part remains unconfirmed, seeing how Ulrich didn't seem in good terms with her in the prequel.
"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.
- Badass Teacher: He doesn't appear to be one at first glance, but he can be.
- Butt Monkey: Even more so than Odd and Sissi, being subject to physical comedy at his expense as much as verbal comedy.
- Catch Phrase: "I'd rather not talk about it", when referring to the various jobs he had.
- Crouching Moron, Hidden Badass: Most of time, he is portrayed as goofy, clumsy and a bit stupid, to the point even the students don't take him seriously. When given the chance, however, he can actually be competent.
- Department of Redundancy Department
- Drill Sergeant Nasty: Possibly a parody. Apparently, he firmly believes he is this, forgetting he is just a gym teacher.
- Expansion Pack Past: Every time he talks about his past, he's got something new to add into the mix. No word on how much of it is true.
- Gratuitous Disco Sequence
- I Minored in Tropology: Or rather, "I was a former Navy Seal/CIA operative/FBI agent, etc."
- Jerk with a Heart of Gold: Brash, hot-blooded, almost always angry, but he does care about the well-being of his students.
- Let's Get Dangerous!: On those rare occasions when he gets serious, he's a force to be reckoned with.
- The Munchausen: Maybe. His various accounts of his previous life range from the interesting to the patently ridiculous. But there's no proof that he's lying.
- Noodle Incident: Over the span of his career... too many to count.
- Papa Wolf: The students may not actually be his children but they're his students and by golly, he's going to protect them!
- Plucky Comic Relief: It goes to show what kind of show this is that the old gym teacher plays this role.
- Pointless Band-Aid: Under his left eye. He probably thinks it makes him look tough.
- Properly Paranoid: He is firmly convinced the Lyoko-Warriors are doing something behind everyone's back, an impression Delmas only sees as paranoia.
- Sixth Ranger: Temporarily, at the end of Season 1. But then he gets his memory erased when the gang go back in time.
- Took a Level in Kindness: In Season 1, Jim spent a lot more time trying to find out what the Lyoko warriors were hiding, which made him antagonistic to them in general, to the point of inadvertently causing Jeremie to fall down a flight of stairs. This subsequently gets a horrified Jim fired, but Jeremie decides to reveal the truth to Jim, as he was injured and needed Morales to help. From this point forward, Jim seems to become a lot more lighthearted as a character, even after the Reset Button in the Season 1 finale. It's notable that Season 2 is what picks up on the "I'd rather not talk about it" Running Gag.
"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: He's completely in the dark regarding Lyoko, but occasionally participates in helping to curb the damage XANA causes in the real world.
- Young Entrepreneur: In Season 4, he's shown selling Subdigitals tickets. He refuses to give any discounts.
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.
- Ambiguously Evil: Throughout Season 2, when the Lyoko Warriors were researching his life, it became increasingly unclear as to whether or not he was a good guy or an insane madman, with Ulrich at one point saying that Hopper was, in a way, a second enemy to deal with. His design for a neuronal headset nearly killed Jeremy (Which was why Ulrich suggested him as an enemy), Aelita's flashbacks of him were extremely ominous in presentation, and the Polymorphic Specter of him had his personality down pat (Yumi honestly thought that the clone was the real deal). Not to mention how his sanity did in fact, plummet during his research concerning Lyoko. It wasn't until Aelita's memories were restored in the Season 2 finale that Hopper was confirmed to be on the side of good, and he was firmly seen as the Big Good from that point onward.
- 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 large, brilliant ball of light. In a flashback during Episode 57, his form consisted of a cluster of smaller balls of light.
- Big Good: Everything the heroes have to fight against XANA is thanks to Dr. Hopper. And he occasionally helps more directly if the situation calls for it.
- 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.
- Mysterious Past: The specific details of his work concerning Project Carthage is never revealed, even when the show ends.
- Non-Action Guy: Downplayed. His virtual form is not capable of direct combat, much like Aelita in the first two seasons and he's absent for most of the series. However, the data he gives to the Lyoko Warriors is critical in enabling them to continue fighting XANA, and in the end, his Heroic Sacrifice and compiling of the anti-XANA program effectively gives him more credit in defeating XANA.
- Opaque Nerd Glasses: In life, he sported a pair of these.
- Papa Wolf: XANA knows it, and exploits it throughout Season 4.
- Phlebotinum Rebel: Franz Hopper created XANA to destroy "Project Carthage", which he was previously working on. Whether or not he succeeded in doing so is unknown.
- The Professor: In a roundabout way, thanks to his diaries.
- 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.
- Sanity Slippage: Suffered a heavy case of it during the creation of Lyoko. His abuse of the Return to the Past (He repeated the same day over 2,500 times without rest) made him extremely paranoid, as seen in his diary, as well as having a delusion of grandeur, as he called the Supercomputer his 'Great Project'.
- 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 his present-day light ball form) is never heard to speak.
"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: A copy made of Hard Light. It's able to simulate humanity well enough.
- 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: A rather...imperfect clone of William.
- Hard Light: "Random polymorphic energy" to be precise, whatever the hell that means.
- 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).
KiwiOdd'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: Bordering on Ugly Cute at times.
- Robot Me: Kiwi has a robot duplicate built by Jérémie.
- Team Pet: To the Lyoko Warriors.