As this person points out in this analysis, Omi is using his prideful behavior to cover his abandonment issues and was legitimately heartbroken when Raimundo betrayed the team and even after he joins back up, is legitimately scared Rai doesn't mean it, only coming to trust him again in the original series finale.
Jack falling for the monks' trick. Is he genuinely that stupid or is he so desperate for approval that he doesn't care that it's fake?
Awesome Music: The opening theme is one of the best examples of combining Chinese flutes with some electronic beats. Observe!
Base-Breaking Character: Omi is the biggest one. Despite being the main character and having the most focus out of any Xiaolin warrior, some people hate him due to all his flaws, mainly his obnoxious arrogance, which gets exacerbated as the series progresses. Others think that he's not that bad, as his morals often outweigh his faults and he does display maturity every once in a while.
Big-Lipped Alligator Moment: The ending of "Judging Omi". Following his journey into the Yin-Yang World, Omi is turned evil by the Yin Yo-yo. Fine, how does the show illustrate this? By changing the pattern of the dots on Omi's forehead, of course! This is then followed by two even bigger BLAMs: First, Chase randomly proclaims that "the prophecy has been fulfilled", despite said prophecy not having been mentioned or even foreshadowed at any prior point during the season. Then, the episode ends with the Earth being split in half.
Chase Young on the other hand is popular for being an evil mastermind who help push the show into darker and complex storylines, as well as having a backstory that showed he wasntevil to begin with. Fans tend to focus on that and overlook his crimes, which include manipulating Omi to become his evil apprentice in the second season. His relationship with Jack (and to a lesser extent Wuya) is downplayed for shipping purposes, even though hes made it clear several times he considers both of them below him.
Ending Aversion: The two-part finale overall was considered disappointing for a variety of reasons:
The initial confrontation with Jack Spicer, where the monks cross the line from punishing his misdeeds into straight up bullying.
The inexplicable bad future, where Jack Spicer was able to take over the world and subdue both the monks and the remaining villains by stealing the temple's Shen Gong Wu. This despite previous episodes establishing that his incompetence was such that even with the aid of said mystical artifacts he was barely an annoyance to the other characters, especially Chase Young.
The huge Continuity Snarl brought about by the revelation that Chase and Guan participated in the war against Wuya.
The final showdown:
Instead of allowing the cast to showcase their teamwork in a final battle against the Big-Bad Ensemble, the showdown works so that only one member of each team can participate at a time. The villains predictably call bullshit on this rule and gang up on the monk that is currently tagged in.
The Shen Gong Wu used by both parties are amongst the most forgettable of the bunch, and in general do nothing but provide a minor inconvenience to their target (noticeably, three of them do nothing but summon insects to attack the victim).
Despite being the main character and the reason why that particular showdown was occurring in the first place, Omi does nothing but cheer on his teammates for the duration of the showdown, only tagging in after all the opponents have been defeated by Raimundo.
The fact that all of the changes to the timeline are undone, meaning Chase is still a major threat, Hannibal is still on the loose and the monks' entire journey was pointless. However, it did provide Omi with some much needed character development so that he could accept Raimundo as the team leader.
And finally, the last few seconds of the episode. A major Gainax Ending where every single villain, even ones that shouldn't exist by this point (Gigi and Mala Mala Jong), teams up to raid the Xiaolin Temple. The protagonists charge into battle and... Smash to Black.
Ensemble Dark Horse: Le Mime has a fairly sizable fanbase despite having a major role in only one episode.
Wuya is one of the curviest and bustiest female characters in the series and she fills out her Heylin outfit very nicely. She also gets some Male Gazeon a car when seducing Raimundo during his brief time on the Heylin side.
Katnappé also counts with her appearance of a pretty teenage girl who wears a skin-tight Spy Catsuit as part of her Heylin identity.
Dyris is this in her mermaid form, taking the appearance of a beautiful girl whenever she's in water who is able to seduce all the boys except Klofange, who is the only one who knows about her true nature. She's still able to fool Omi even after the monks discover she's not on the good side and Kimiko takes offence when he calls Dyris a "beautiful girl". When she's on land, on the other hand, she takes a monstrous form.
Fanfic Fuel: Due to the finale ending with Raimundo being promoted to Shoku Warrior and Xiaolin Chronicles already having the rest of the monks be promoted to the same rank. There are a lot of fanworks centering around him working around on being the new team leader.
Raimundo's throwaway line in "Chameleon" (season 1, episode 6) - "Maybe I'm missing the point. We're never gonna go after each other!" Talk about Tempting Fate.
When Omi had the job to guard Dojo when he was about to turn evil, one of his attempts to convince him to release him from the box was by disguising as, among other things, his mother, something Omi doesn't fall, knowing that he's an orphan. The joke becomes a lot less funny after the episode "Omi Town", where he falls for a real parent trap and is overall one of the biggest woobie moments for him.
"Mala Mala Jong" marks the point where the series starts taking itself more seriously without losing its humor, the episodes start becoming more interconnected, as well as letting the show become much more character and arc-centric.
The final season is more favourable for developing the Xiaolin monks as they hone their skills and compete for who becomes leader of the group. Their elemental powers get expanded and they gain new Wudai weapons as well. The season/show concludes with Raimundo becoming leader after receiving several character focus episodes and completing his story arc in the show.
Idiot Plot: When you get right down to it, the finale is nothing but a giant display of Omi's stupidity. Barring the fact that his plan to retrieve the Sands of Time from his future self violated even the most basic common sense, there were already two Shen Gong Wu at his disposal that could be used to accomplish his goal of turning Chase good: The Yin and Yang Yo-yos, the very same tools that Chase used against him in the previous season to lure him over to the Heylin side.
Inferred Holocaust: Preventing the world from ending or plunging into darkness is a recurring threat the monks face. But when things do end up taking a turn for the worse, the show doesnt really address the consequences or implications outside of the casts reactions.
The first season finale has Wuya regain her physical form and promptly conquer the world. While its not shown explicitly, there is a scene where she orders her minion to send the United Kingdoms prime minister an ultimatum to surrender or shell sink the island to the bottom of the Atlantic Ocean.
"Enter the Dragon" confirms the existence of Atlantis in the show's universe which Dojo sank during his last evil phase. Atlantis is later shown intact and empty in "Dangerous Minds", but now infested with a horde of giant spiders. This could possibly explain the lack of inhabitants, if they somehow managed to survive the previous catastrophe.
"The Deep Freeze" has Jack Spicer control of the Lunar Locket, which enables him to control the Moon's phases and movement. He loses it to the episode's villain who then proceeds to plunge the Earth into a deep freeze after causing the Moon to eclipse the Sun. Only the temple is shown buried underneath ice and snow, with the rest of the planets status left mostly to speculation.
The series finale has Jack Spicer taking over the world in a future timeline. The main cast are thrown into whats implied one of many prisons and the monks have been forced to fight into their old age for Jacks amusement. The rest of the world is considered to be a dystopia because of him as well.
Raimundo. He's rather selfish and lazy, not to mention a jerk who outright admits he makes fun of Clay and Omi in one episode, then spends another one antagonizing Kimiko. But underneath his asshole tendencies is someone who fears to be not good enough and letting people down, not to mention his brief stint on the Heylin side is something he genuinely regrets doing.
Jack Spicer. A spoiled, rich teenager bent on world domination, whose first encounter with the monks is ordering his robotic minions to 'mince' them. He has no problems taking advantage of peoples trust, manipulating others, and throwing allies (even Chase) underneath the bus to save his own skin. That being said, because he gradually morphs into the series' punching bag, one cant help but feel sorry for him.
Magnificent Bastard: Once the greatest hero to have ever lived, Chase Young was tempted into drinking the Lao Mang Lone soup which gave him eternal youth in exchange for corrupting his soul to the Heylin side. Betraying his benefactor, Chase spent 1500 years honing his own skills while maintaining his youthful appearance. Seeking world domination, Chase saw interest in Omi, whom he constantly helped deal with common threats earning the young monk's trust. Chase eventually tricked Omi into defecting to his side by trapping Master Fung into the Ying-Yang world, forcing Omi to use the Ying Yo-Yo to rescue him, unaware that his good chi will be left behind. Even after Omi reverts back to the Xiaolin side, Chase took advantage of Omi's adherence by showing him a vision of his Heylin self pledging his loyalty to him, causing Omi to reluctantly remain by his side. When the Xiaolin monks defeats him in a showdown, Chase accepts his loss and releases Omi from his grasp. A ruthless, self-serving yet charismatic and honorable Heylin warlord, Chase Young stood out as one of the Xiaolin's greatest foe, never being truly defeated in the end despite suffering numerous setbacks.
Memetic Molester: According to some parts of the fandom, Chase Young is this to Omi. Not helped with lines like these:
A lot of sayings Omi butchers become these as well.
SECRET ELABORATE PLAN!
Never Live It Down: The monks beating up Jack Spicer at the beginning of "Time After Time" has definitely soured a portion of the fandom's opinion of them. It doesn't help that said beatdown comes after Jack had already conceded defeat and ends with them presenting 'mementos' to Master Fung, which included among other things a chunk of hair Clay ripped off Jacks scalp.
Seasonal Rot: With the exception of the monks becoming Wudai Warriors and receiving their Wudai Weapons, the final season is considered the weakest of the shows three seasons. This is due to several reasons:
The previous ensemble of villains was replaced with a new one named Hannibal Roy Bean. Throughout the season hes referred to be an even worse threat than Chase and Wuya although hes never shown being particularly dangerous or getting the chance. Hannibal also lacks the attractiveness the former two have or the charm Jacks known for and ended up being one of the most hated characters in the series.
The series was very meticulous about keeping careful track of which characters had which Shen Gong Wu from episode to episode in the first two seasons. They stopped keeping track in the last season, with one side stealing several Wu from the other at once and the show never mentioned which were stolen. It became difficult to stay invested in the show when Wu would just randomly appear for either side.
And finally, a disappointing ending riddled with plotholes that ultimately undoes itself via Cosmic Retcon.
Ships That Pass in the Night: The Chase/Kimiko or Chamiko pairing is fairly popular, despite the fact that they rarely interact with each other outside of battle and are never seen on screen in the same frame. In fact, the only time they had any significant interaction was when Kimiko disguised herself as Jack in order to fight in his place and Chase's line about liking her perfume implies that he knows he's actually Kimiko, but in her normal form, they don't have any significant interaction.
Despite being the one who defeated Wuya, created the Shen Gong Wu, and founded the Xiaolin Temple, Grand Master Dashi appears four times in the show all of them flashbacks. Beside this and the occasional mentioning from characters present, there's not much known about Dashi. He doesn't receive a backstory explaining his motives and personality like others have gotten.
Wuya is a major character in the show, though her presence begins to diminish when she's replaced as the main villain season two onward. As with Grand Master Dashi, aside from being a powerful Heylin witch, there's no background into who she is or where she came from. The show has alluded to her knowing Dashi and Hannibal Roy Bean on a more personal level, but with no further elaboration.
Jermaine is probably the epitome of this trope: he was introduced in season one, immediately had great chemistry with the monks and Jack Spicer, and had the promise of being a recurring character. When he does return in season two, he's achieved the rank of Wudai Warrior and has been trained by Chase Young. Unfortunately, his second appearance is mostly overshadowed by Omi needing to learn a lesson (again) and he's quickly sent back to New York, never to be heard from again.
Clay is an interesting case: whereas the other monks would receive several episodes focusing on them, he receives the least amount of development and largely remains absent in the show. Interestingly enough, it has been implied several times he's got some hidden depths, as seen in his hobbies and the occasional insightful observations. Furthermore, his focus episodes showcase how dysfunctional his family is, which could give his calm and quiet personality a whole new interpretation.
The show has made several references to the casts' families. In particular, the members of Clay, Kimiko, and Jack Spicer's families have at least one appearance in the show. However, none of them had a substantial role to give an insight to the home life of the monks or Jack Spicer.
Now and then, there are Shen Gong Wu that are outright malicious (the Sapphire Dragon), used to seal an entity (Sibini and the Mosaic Scale), or could be combined to form a particular evil antagonist (Mala Mala Jong). Furthermore, the episode "The Last Temptation of Raimundo" shows Wu becoming sentient after the passing of the Heylin Comet. An exact reason behind this behavior is never really explained or explored.
When Omi becomes evil during the season two arc, Chase proclaims the prophecy has been fulfilled. Said prophecy has never been spoken off before not even by Chase himself so it comes right out of the left field. Even worse, it's never referenced by him again for the remainder of the arc or series.
Related to that, the Treasure of the Blind Swordsman is a MacGuffin that can grant its possessor any wishes. Obtained early on by Hannibal, lost to the monks two episodes later and used only once before the end of the series, in a rather inconsequential wish to boot.
Unintentionally Sympathetic: After a while it can be hard to enjoy the abuse Jack Spicer gets put through. While he's undoubtedly done villainous things, his status as a character who's not good enough for either the good guys or the bad guys along with the focus on his insecurities makes it really easy to feel sorry for him. He's given enough Pet the Dog moments that it can look like build up to a HeelFace Turn, but he never quite makes it.
Seriously, Omi trusted Chase Young even though he guessed that he was up to something.
Vlad in "Crystal Glasses". Jack had come up with a surprisingly clever plan where Vlad pretended to be one of the good guys to infiltrate the monks, then get Omi to use the Crystal Glasses to the see the future. Unknown to Omi, Vlad used the Reversing Mirror which caused Omi to see a future where he was evil. The plan worked, and then at the climax of the episode Vlad ruins all of it with his Evil Gloating where he explains how he used the Reversing Mirror on the Crystal Glasses. Even Jack points out how dumb that was.
Kimiko, big time in Tangled Web and Return of Pandabubba. In the former, she is mercilessly teased for her temper and being the first Xiaolin warrior to lose a showdown, while in the latter she breaks down in tears after being violently rejected by her father, who she does not know is currently under mind control.
Dojo in Master Monk Guan what with being the butt of everyone's jokes, called out for not helping the monks fight Jack's Wuya-Bots even though they've always known he's not exactly brave and he almost gets killed so Chase can use him as a soup ingredient.