These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Adaptation Displacement: Just look at how many tropes here are about the cartoon series instead of the original comics.
Averted in Europe, where the comic is still more well-known, since Disney comics are big in Europe.
Anti-Climax Boss After a, for the most part, spectacular second season, things climax with a final battle against Cedric, who was defeated, like, 100 times before, and even with his new powers, this didn't turn out any different.
Mainly because the Guardians went One-Winged Angel as well, while Cedric's new form wound up being more clipped than anything. Otherwise, Cedric would have gone Godzilla on Heatherfield. Poor Cedric; he just can't catch a break.
At the end of the Ragorlang saga in the comics, Edward Folkner, the Ragorlang hunter, is forced to fuse himself with the Ragorlangs, when the magical box he had created to capture the Ragorlangs is threatened to be taken away from him. He's going to come back some sagas later as a dangerous foe, right? Wrong! In the next issue, the girls defeat him quite fast at the end of that issue
Anvilicious: Some of the latest comics can come off as this.
Badass Decay: Cedric and Elyon suffered this in the cartoon series.
Early-Installment Weirdness: The comic's first few years really turned poor Will into a major Butt Monkey, to the point where the comic's third year is kicked off with her gambling-addicted Jerk Ass father trying to ruin her family's livelihood, followed by her dormouse getting ran over.
Phobos and Will, anyone? The animated show has its fair share, too.
Growing the Beard: The second season of the show, headed by Greg Weisman, greatly cut down on the bad comic relief, introduced a very cunning villain in Nerissa, placed more focus on WITCH itself, made the story an interesting battle of wits and trickery, and improved the combat sequences. Shame it ended right after.
Mondegreen: Prior to the point where Will's element in the Transformation Sequence became "quintessence", it was variously heard as "it worked", "big hook", and various other odd phrases. Closed captioning programs had particular difficulty with it.
It's changed so that it's audible as "the heart" eventually.
The Sword of Exile. It doesn't just kill you, it erases your very existence, and everyone's memories of you disappear. Essentially, if it had retroactive erasure as well, it would literally wipe every trace of you out of existene, but thankfully, your deeds themselves are not erased.
The astral drops exist in some kind of limbo. There's nothing on this place except for the astral drop, who is alone, can experience feelings like anyone else and... she's trapped there unless the Guardian that created her takes her out of there.
The astral drops probably have it worse in the cartoon, even though their not sentient. They come into existance for a while, and after they're not needed they're made to go "poof". As if they never existed in the first place. Kinda sad really...
The Scrappy: Blunk, though it's not so bad as people make it out to be, especially once he's toned down by the end of Season 1. It still says something that a character voiced by Steve Blum could be so unpopular in the first place.
Seasonal Rot: To some fans, some of the latest comics aren't as good as the first few sagas; mostly due to the fact there are no real villains that stick around longer than a couple of issues, and the stories can sometimes come off as Anvilicious. Where it started varies heavily between fans.
Squick: Will's reaction in "T is for Trauma" when Cornelia accidentally brings up the subject of Parental Incest. Also Irma and Hay Lin's response to Minion Shipping with Cedric and Miranda.
The second is pretty understandable, as it is both bestiality and pedophilia. Miranda is a little girl that transforms, Cedric is a monster disguised as a man.
Toy Ship: Lillian and Christopher in "W for Witch".
Ugly Cute: Blunk. According to Hay Lin he's "sort of cute."
The revelation that Matt was Kandrakar's agent from the beginning, even though he could have helped in previous saga, and it ruins the Secret Keeper intrigue in the fifth saga. But the Squick part is: a Really 700 Years Old agent sent to keep an eye on the guardians, being the boyfriend of a pubescent girl?
It's also implied that Matt was reincarnated and didn't actually know until his memories were awakened at the start of the New Power saga, due the fact that Orube and him have no idea who the other is when they first meet and repeated appearances of Matt's grandfather and mother, plus a girl who went at grade school with him.
Villain Decay: In season 2, in the same episode that he was freed from prison for the first time, Elyon forces Phobos back in, without even an onscreen fight.)
Possibly justified; in the first season, Phobos was explicitly leaching life energy out of Meridian to fuel his powers, but since he'd spent the last ten or so episodes imprisoned he would have had no oppurtunity to do that. With just his native powers as an Evil Sorcerer, it's not much of a stretch to say that he's stronger than any Guardian, but enough weaker than Elyon that she could handle him with little difficulty (after all, she is very explicitly the more powerful of the royal siblings).
In the comic, Phobos is stronger than all five Guardians together, even when drained and at his weakest. It's just that Elyon is a Physical God with power to purge global magical decay with a handwave.
Cedric plays this totally straight, getting easier and easier to defeat each time he shows up. Even when betraying Phobos and absorbing ultimate power in the end, he winds up not knowing how to properly use it and is defeated yet again.