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    Mr. and Mrs. Ishiyama 
Takeho and Akiko Ishiyama

Takeho voiced by: Mathieu Moreau (French), David Gasman (English), Masaru Uekura (Japanese)
Akiko voiced by: Nathalie Stas (French), Jodi Forrest (English)

Yumi's parents.


  • Big Eater: Takeho is seen twice in Season One wolfing down bowls of noodles in one go.
  • Good Parents: They worry about their children, but at some points, this becomes a hindrance to the group due to said concern.
  • Obliquely Obfuscated Occupation: It's never made clear what exactly Takeho's job is.
  • One Head Taller: Akiko is noticeably taller than her husband, and it seems that Yumi took after her in that regard.
  • Parents as People: Embody this the most out of the parents of the Lyoko Warriors. Being foreigners from another country seems to have put legitimate stress on them at times, with them needing to spend time apart during a Season 1 episode, and Takeo's job-status being critical during a later Season 2 episode. They're also the most observant of Yumi's suspicious behavior owing to her not being a boarder, but considering that their daughter is fighting, as Odd puts it, a demonic Artificial Intelligence, they're quite right to be worried. Regardless of their issues at times, they love their children no matter what.
  • Pink Girl, Blue Boy: Inverted in season 4, where Takeho wears a pink shirt and Akiko a light blue one.
  • Plot-Mandated Friendship Failure: A marriage version of the trope is at play in "Laughing Fit": Yumi's parents are angry at each other for reasons not completely explained, but they make up by the end of the episode.
  • Status Quo Is God: Yumi's parents sometimes get into disagreements, but in the end, everything turns out fine; and when Takeho loses his job in "The Chips are Down" (which would have forced Yumi and her family back to Japan, if one in France wasn't found), he finds a new one by the end of the episode that allows Yumi to stay in France.

    Hiroki Ishiyama 
https://static.tvtropes.org/pmwiki/pub/images/hiroki_9472.png
The only Annoying Younger Sibling so far.
Hiroki Ishiyama

"YUUUUMIII, your boyfriend is here!"

Voiced by: Guylaine Gibert (French), Barbara Weber-Scaff (English), Gergei Mayén (Latin American Spanish)

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, but also shows some useful skills. 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: Yumi seems to think so, and indeed, Hiroki pretty much exists to be annoying for most of the series. There are some signs of him growing out of it during season 4 in regards to his crush on Milly causing him to stammer and become more nervous, but his overall attitude remains the same.
  • Everyone Knows Morse: He does have an excuse for this, though; he and Yumi learned it to talk in secret at the table.
  • Hidden Depths: He demonstrates a surprising ability with picking locks in "Hot Shower".
  • Hopeless Suitor: To Milly.
  • O.O.C. Is Serious Business: There are two times when he won't behave like an obnoxious brat: When XANA's attack at the time seems on the verge of success, and when his crush on Milly pops up.
  • 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.

    Mr. and Mrs. Stern 
Walter and Mrs. Stern

Ulrich's parents.


  • Abusive Parents: As mentioned above in Ulrich's profile, Walter is constantly berating his son, only seeming to care about his grades, and not caring about the reason why they are so low by the time of seasons 3 and 4. He also immediately dislikes his son's friends despite not knowing them (as an example, he considers Jérémie, known as Kadic's resident genius by staff and students alike, a good-for-nothing), and rarely contacts Ulrich. Mrs. Stern isn't much better, being an enabler that just sits by and watches her husband berate Ulrich.
  • Adaptational Nice Guy: In the Code Lyoko Chronicles novels, Walter Stern, while still having a troubled relationship with his son Ulrich, ultimately reconciles with him.
  • Bystander Syndrome: Mrs. Stern's role is largely confined to the background watching Walter chew out their son, siding with her husband whenever Ulrich tries to defend himself or call his dad out.
  • Death Glare: Walter's default expression does not reflect any warm feelings, especially after when it looks like Ulrich threw a soccer game, albeit to go reluctantly save a teacher from a XANA attack.
  • Education Mama: Invoked; Ulrich's terrible grades is a major contributing factor to his strained relationship with his father.
  • Hate Sink: Mr. Stern is, to put it simply a Jerkass of the highest order, being emotionally abusive of his son, a stark contrast from the parents of the other Lyoko Warriors, and is implied to be a nasty Competition Freak by Odd. Angry and irritable at the slightest provocation, the man only shows affection to Ulrich when he's on the verge of dying.
  • Named by the Adaptation: Mr. Stern is named Walter in Code Lyoko Chronicles. Still nothing regarding his wife's name.
  • No Name Given: We never learn their first names in the show. The novels at least name Mr. Stern, giving him the first name of Walter.
  • So Proud of You: Mr. Stern's last words to Ulrich when it seems that he's going to die in "Zero Gravity Zone". Made Harsher in Hindsightinvoked when we consider the fact that this was the only nice thing he ever did or said in the entire series.

    Jérémie's Parents 
Michel Belpois
  • The Ghost: Jérémie's mother never makes a physical appearance in the show, but dialogue indicates that she's still alive, well, and still married to Michel.
  • Good Parents: They're very accommodating to Jérémie, and very understanding of him.
  • Open-Minded Parent: In "Distant Memory", Jérémie's father is receptive to the idea of his 14-year-old son having a girlfriend, even saying how the boy's romance reminds him of his own relationship with Jérémie's mother. Later in the same episode, Jérémie tells Aelita that his parents have no issue with her staying over at his house.

    Odd's Family 

Odd's parents, Mr. and Mrs. Della Robbia, and his five older sisters, Adele, Pauline, Elizabeth, Marie and Louise.


  • Big Sister Bully: In "Distant Memory", Odd recalls the day in the last holidays when his sisters locked him in the bathroom for an entire night just because they thought it would be funny.
  • The Ghost: Odd's sisters are this, as they never make a physical appearance during the entire show. His parents were also this for most of the series, as their first and only physical appearance only takes place almost at the end of the final season.
  • Good Parents: Odd's parents are completely supportive of him and his hobbies, to Odd's dismay, at first.

    William's Parents 

William's parents, James and Mrs. Dunbar.


  • Good Parents: James frequently calls William and quickly worries about him when he doesn't call anymore. Upon visiting Kadic with his wife, they try to spend time with their "son" (eating with him in the cafeteria, asking him how he's doing) and both ultimately figure out Clone William isn't their son. The few interactions the real William has with his parents implies they're very close.
  • Irony: William, a self-proclaimed "rebel", is actually very close to some authority figures, namely his parents.
  • No Name Given: William's mother is not named.

    (Spoiler Character) Franz Hopper 
https://static.tvtropes.org/pmwiki/pub/images/Franz_Hopper_4963.jpg
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), Víctor Delgado (Latin American Spanish), Pablo Sevilla (European Spanish)

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 is a good guy or an insane madman, with Ulrich at one point suggesting that Hopper is, in a way, a second enemy to deal with. His design for a neuronal headset nearly kills Jérémie (which is why Ulrich brought him as an enemy), Aelita's flashbacks of him are extremely ominous in presentation (even his most heartwarming moments picture him as a rather distant father), and the Polymorphic Specter of him has his personality so down pat that it can deceive a viewer (nobody honestly doubted that the clone was the real deal). Not to mention how his sanity did in fact, plummet during his research concerning Lyoko. It isn't until Aelita's memories are restored in the Season 2 finale that Hopper is confirmed to be on the side of the Lyoko Warriors, and he is firmly seen as the Big Good from that point onward.
  • Ambiguous Situation: Basically everything about him. We get almost no info about his backstory, alignement, goals, other than various implications in several directions; the only more or less unambiguous thing by the end of the series is that he helped Aelita and the Lyoko Warriors and eventually did a Heroic Sacrifice for their sake.
  • 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. He occasionally helps more directly if the situation calls for it.
  • Color-Coded Characters: The towers and monsters under his control are marked by a white aura. His avatar is also marked with white on the Supercomputer when it appears.
  • Comic-Book Fantasy Casting: Appearance-wise, he's Philip K. Dick with added opaque glasses for extra mystery. The creators of the show are fans of him, and also used his surname for "Kadic".
  • Crazy-Prepared: He locked his journals behind such high-encrypted coding Jérémie predicts it'd take a year to break it, then hid them in a random locker with the key being in a toy doll, which itself was hidden behind a compartment in a wall in a house in the woods. Exaggerated in the novels, wherein among other things, he: manually broke apart and hid Code DOWN, bricked up an entire part of the Hermitage to hide another diary, wrote notes in invisible ink, and downloaded all his work into Aelita's brain just so she could recreate it if she had to enter Code DOWN. The man's modus operandi was basically predicting and preparing for anything that could possibly go wrong; even XANA turning on him was something he figured might happen, he just had no choice but to flee to Lyoko.
  • Demonic Possession: Downplayed, as while he is certainly no villain, he still does possesses Sissi in order to send a message to the Lyoko-warriors.
  • The Ghost: A subversion. While he does technically have an onscreen appearance as his light ball avatar, there are no scenes of him as a human (or just lines of dialogue) that aren't part of a flashback or an imitation by XANA. Given that the mentioned avatar is silent and without any traits, it can be truthfully said that the viewer never gets to see Hopper actually interact with the main cast.
  • 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. It's worth noting that when dealing with him, XANA becomes far more driven and dangerous than he usually is.
  • 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: Many of his actions are motivated to protect his daughter. Unfortunately for him, XANA knows it, and exploits it throughout Season 4, using Aelita as bait to draw Hopper out of the Digital Sea in order to kill him. He's willing to take blow after blow as long as he can then get Aelita to a safe location.
  • 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 moniker 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 the season two and four finales, he sacrifices himself for Aelita. The Season 4 sacrifice seems definitive.
  • Superpower Lottery: Like Aelita and XANA-William, he has the Annex Program. He helped and saved the Lyoko Warriors more often than not when using it, possessing Sissi to communicate with them or possessing Mantas to save the Lyoko Warriors. See Aelita's Superpower Lottery for more information on the Annex Program.
  • The Stoic: He has exactly two facial expressions: open-mouthed and closed-mouthed. It helps to present him as a deeply reserved man.
  • Taking You with Me: Allows himself to be killed by Mantas while providing enough energy for the anti-XANA program to function, ensuring XANA dies along with him.
  • 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, and lost his marbles due to the strain of his experiments.
  • Virtual Ghost: Franz was never able to take on a corporeal form on Lyoko, only able to manifest in the form of a cluster of light orbs (Season 3) and a bright ball of energy (Season 4).
  • The Voiceless: While his voice is heard on screen, it's always either in a flashback, a recording, or a XANA trick. Hopper himself is never heard to speak, as his present-day light ball form lacks the ability to do so.


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