History YMMV / CodeLyoko

** The characters' ''enormous'' foreheads are subject to many, many jokes.

** Similarly, her slow walk into the Tower to deactivate it when XANA's attack on Earth [[JustInTime is on the verge of succeeding]], courtesy of early show's frequent use of StockFootage, still leads to frequent jokes in the fandom about yelling at Aelita to hurry up. This is even after later episodes began using new footage that shows her ''running'' into the Tower and showing an overall greater sense of urgency.

** Aelita's slow walk into an activated tower in the early seasons has been subjected to a ton of funny jokes throughout the series run, with many in the fandom yelling at her to hurry up. To the point it even got fanart.

** People blaming various inconveniences on XANA, usually technical difficulties.

** "'Pick on Yumi' time", thanks to Yumi being a frequent target of XANA. (See FanNickname)

* TheProblemWithLicensedGames: The games based off this series either range from decent at best to a lesson in masochism at worse. The first game on the DS verges on FakeDifficulty thanks to nearly ''all'' the monsters operating under InstantDeathRadius; The following DS game ''Fall of X.A.N.A.'' was decent, albeit slow and uneventful in gameplay; The console game ''Quest for Infinity'' was alright as well, albeit extremely biased towards ranged characters over melee characters since melee characters deal pitiful damage by comparison.

** [[BrainwashedAndCrazy Aélita Schaeffer's xanafied self]] combines her good self's intelligence with XANA's ruthlessness. [[Recap/CodeLyokoS2E6 Pretending to be her good self in her first appearance]], she manipulates Jérémie Belpois into sending her to Lyoko, talking Yumi Ishiyama into going with them when Jérémie expresses reluctance in Aélita going on Lyoko alone. On Lyoko, XANA-Aélita stays ahead of her fellow [[Characters/CodeLyokoLyokoWarriors Lyoko Warriors]] through clever uses of her Creativity powers, leading to her all but completing her mission. Returning as a recurring villain, XANA-Aélita works well in tandem with XANA and its monsters, successfully destroying three of the four main sectors and setting up XANA's victory in that season. [[Recap/CodeLyokoS4E25 In her final appearance]], XANA-Aélita cleverly reacts to Ulrich Stern's attack, stealing one of his swords and defeating him with only a limited use of her powers, nearly completing her mission. Always thinking on the fly and [[SuperpoweredEvilSide showing how truly dangerous Aélita's powers could be]], her xanafied self proved to be one of the Lyoko Warriors' most dangerous threats.

** One episode has Patrick Belpois shout out Geronimo while attacking XANA-Sissi, he would be unaware that it would eventually be the signature catchphrase of [[Franchise/DoctorWho a Time Traveling Time Lord who wears bow ties]].
** One episode has Ulrich mention that the music XANA made was rather unoriginal. Fast forward to TheNewTwenties when AI that was able to "Create" content like music, art, and prose was basically "Taught" it by feeding prompts.

** 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).

** Taelia is also suprisingly popular for her short appearance, mainly for bearing a strong ''spooky'' resemblance to Aelita (except for having red hair) and her name being an rearrangement of Aelita's.

** Brynja Herinsdotir, the titular girl of the episode "Kadic Bombshell" is this for very obvious reasons, mainly for being a MsFanservice having by far the ''biggest'' breasts of the girls to the point of putting ''Sissi'' to shame. Many had hoped she'd return, but ultimately got PutOnABus due to Sissi's jealousy in order to maintain the StatusQuoIsGod.

** One common fanfic people tend to write about surrounds potential recruits to join Team Lyoko. Jim and Sissi being the two standout candidates.

* {{Moe}}: ''All'' of the Lyoko warriors are considered BadassAdorable by fans.