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YMMV: Code Lyoko
  • Alternative Character Interpretation: XANA, because little is actually established about him/her/it, can be translated anywhere from misunderstood, going for some vague goal in its programming, bugged, to a complete monster.
  • Copy Cat Sue: The fanfiction. Good luck trying to find a story without an OC going/knowing about Lyoko or some event that leads Yumi and Ulrich to confess their love for the other.
  • Crowning Music of Awesome:
    • The theme song, despite having cheesy lyrics, is extremely catchy. Worth noting is that it's a lot less cheesy in French as opposed to English. Both versions are total Ear Worms, though. However, translated, the two versions pretty much mean the same thing. The French version is actually a lot more repetitive.
    • Everyone loves the awesome virtualization theme.
    • "XANA Attacks!" is the ominous and oppressive-sounding leitmotif of the Big Bad in the series that signifies when things are getting dangerous, and the melody appears in other fast paced battle themes like "XANA's Monsters" and "Facebook Battle 2".
    • William's battle theme. Very much the Theme Music Powerup.
  • Die for Our Ship:
    • William was despised by most fans for getting in the way of Ulrich and Yumi's relationship (not that they needed the help). A few defected after Season 4, but he is still largely a disliked character.
    • Also Sissi for some in the Fan Dumb, even though she was barely ever a threat to said Ship. To be fair to these fans, the writers DID give Ulrich and Sissi some pretty big damn kisses in "Frontier" and "Ultimatum", all the while cutting Yumi and Ulrich's kiss short in "Routine".
    • Theo Gautier, a one-shot character who displayed interest toward Sissi then toward Yumi, is either used to get Sissi out of the way while averting this trope, or portrayed as a Jerkass and abusive boyfriend toward Yumi so she can run into Ulrich's arms (despite the fact he is even less of a threat than Sissi is).
  • Dungeonmaster's Girlfriend: Jérémie writes a program to calculate "points" scored by defeating monsters. Guess who wins...
  • Ear Worm:
    • The theme song.
    • The monster theme.
  • Ensemble Darkhorse: Clone William is very popular with the fans.
  • Fan-Preferred Couple:
    • A surprisingly large amount of fans prefer Odd×Aelita to Jérémie×Aelita, even though Word of God shot it down.
    • Some fans prefer to put Sissi with Odd due to the occasional Ship Tease and to get her away from Ulrich.
  • Fanon: The name "Team Lyoko" was never used in canon in the actual show; the fans came up with it. Same was true for the name "Lyoko-Warriors" initially, but it became Ascended Fanon.
  • Foe Yay: Odd and Sissi, increasingly moreso as the show goes on.
  • Freud Was Right: Jérémie's Multi-Agent Program (don't ask).
  • Growing the Beard: The first season was, for the most part, a Strictly Formula Monster of the Week-type show, with the exception of the two-part finale. Come season 2, the show became much more plot-focused (whilst still having some filler episodes), there were various changes to the status quo and there was a lot more Character Development.
  • Hell Is That Noise: XANA's pulsations whenever he wakes up to attack; essentially an ominous heartbeat that echoes throughout Lyoko.
  • Hilarious in Hindsight:
    • In "Code:Earth", Yumi is trying to get her parents to agree to letting Aelita stay at their house. When they ask what her parents do, Yumi makes up on the spot that they "work with computers". And who should have created the supercomputer other than Aelita's father, Franz Hopper!
    • When William finds out about Lyoko in "The Secret", Jérémie calms down Ulrich by saying they just make him forget with a Return to the past. William, not understanding what they are talking about, answers he never forget anything. We later find out he indeed remembered this episode's events even after the Return to the Past, though only as a dream.
  • Hollywood Pudgy: In "Tip-Top Shape", Sissi is told by the nurse that she's 5 pounds overweight, but she's just as skinny as always. (The scale read 110.7 lb [50 kg]. If she was 5 pounds overweight she'd have to be 4'7" [137 cm].) Lampshaded by Aelita.
  • Ho Yay: Some of the more notable examples include:
    • "Triple Trouble" — After Jérémie tells Odd that he's developed a new power for him on Lyoko, Odd says, "You're the best, Einstein! If you were a girl, I'd propose to you immediately!"
    • "Replika" — Nicolas initially asks Aelita if she'd like to go on a "fantastic and breathtaking experience in the moonlight". She ends up pulling out, so instead Nicolas ends up spending the night with... Hervé.
  • Idiot Plot: The show stresses The Masquerade, yet the gang has openly mentioned Lyoko and XANA within crowded areas talking louder than anyone else as well as in front of at least one person not privy to the secret — and somehow this generally doesn't expose them all. This has actually happened at least 20 times within the first two seasons alone. Mitigated, of course, by the Reset Button — but the point still stands, as they're way too much relying on it to cover their indiscretions. They also often pass it off as discussing some movie or video game.
  • Iron Woobie: Ulrich when it comes to his relationship with his father.
  • Jerkass Woobie: Sissi on several occasions, particularly during XANA attacks and especially after the prequel reveals that a stupid misunderstanding and Ulrich's hurt feelings contributed to Sissi being a Jerkass to begin with; otherwise, she's kind of nice.
  • Lost in Medias Res: One thing that hurt the show's rep in season one. While it gives the show some mystique and encouraged some to keep watching, for others, they were confused.
  • Magnificent Bastard: XANA, big time. Despite being 1) A never seen character and 2) The only villain in the whole show, he succeed in both inverting Villain Decay, pulling out plans of many sorts and ending a season with The Bad Guy Wins twice.
  • Memetic Badass: Franz Hopper. According to the Lyoko Freak forums, any time Franz Hopper removes his glasses the world is split in half.
  • Memetic Sex God: Two; William Dunbar and background character Thomas Jolivet. Also indigenous to Lyoko Freak.
  • Rescued from the Scrappy Heap:
    • Starting around mid-season 1, Sissi and Jim got much more noble moments and even some awesome ones, and they became mostly very well-liked. Jim also started to become a bit more humorous as time went on, as seen in Season 2 when he started using his "I'd rather not talk about it" catchphrase.
    • To a lesser extent, William was also rescued from the heap when he become The Dragon to XANA, since Evil Is Cool.
  • Romantic Plot Tumor: Ulrich and Yumi's Unresolved Sexual Tension got ridiculous by Season 2, and was soon toned down since Word of God is that MoonScoop had received many complaints about it.
  • Ron the Death Eater: The treatment that Jérémie gets from a lot of Odd×Aelita supporters in fanfiction. Good luck finding Oddlita fanfiction that doesn't feature Jérémie as physically, verbally, emotionally, or sexually abusive towards Aelita.
  • Seasonal Rot: Season 3 is often considered this. Among other things, it was only half as long as other seasons, Yumi's Designated Victim status became exaggerated, the tone was Darker and Edgier than even season 2 (and, by contrast, the comic relief became less funny, especially when it involved the usually-reliable Jim), and also the huge potential after the season 3 finale never came to fruition when season 4 arrived. Season 4, while a step up from Season 3, also gets flak for being too long with too much Padding and boring Filler episodes, and generally not reaching the heights Season 2 did.
  • Ship Mates: Most shippers that support Ulrich×Yumi also support Jérémie×Aelita, and vice versa. Those same shippers will generally ship Odd with either Sam (a one-shot girlfriend of his) or Sissi (a frequent subject of Ship Tease with him.)
  • Squick: In the novel series, Odd falls for a girl named Eva. And Eva is XANA.
  • Tear Jerker: Quite a few...
    • One of the main ones is at the end of the penultimate episode where Franz Hopper sacrifices himself so that Jérémie will have enough power to run his multi-agent program to destroy XANA.
    • Also, when William finally gets de-virtualised, you can pretty much expect the other Lyoko Warriors to tell him off about how underestimating XANA got him Brainwashed and Crazy. Think again — turns out he doesn't remember anything following his first trip to Lyoko on that fateful day, and as a result, the first words he says when he emerges from the scanners come out of NOWHERE: "Was I any good?". Those four words have rarely been so gut-wrenching... And when he can't understand why the group seems to give him the cold shoulder the next episode, you can't help but feel sorry for him, really.
  • They Changed It, Now It Sucks:
    • News of the new project ("Evolution") being live-action is already being met with fervent hatred in some places. Even fans who are willing to give the show a chance have expressed doubts about this change.
    • The novels have also been criticized for taking huge liberties on the source material.
  • They Wasted a Perfectly Good Plot: Season 4 is seen as mostly a missed opportunity amongst the fanbase due to the plot getting shafted for Filler throughout a majority of the season when it could have been used to further the exploration into the digital sea or digging deeper into Xana's Lyoko replicas. The sudden, out-of-nowhere, series ending didn't help matters either.
  • Viewer Gender Confusion: Odd has often been mistaken for a female. Even more so in the French dub, due to his voice.
  • The Woobie:
    • Aelita. Big time.
    • Also, to an extent, William at the end of the show.

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