* AlternateCharacterInterpretation: Does April care about Donnie, OR Casey on a romantic level at all? Does she [[MasterOfTheMixedMessage not realize what some of her actions towards Donnie implies through his eyes?]] Did she have a thing for Casey during season 2 and backtracked due to the [[TraumaCongaLine traumatic events during said season's finale?]] Or is she leading BOTH of them on, only to to turn them down, [[JerkassWoobie because it's the only thing]] [[TheWoobie she can control about her life anymore?]]
** Is Mikey really as stupid and irrational as he seems, or is he insecure about being compared to his brothers and being "just" [[KidAppealCharacter the funny guy,]] and said stupid and irrational actions are just his misguided way of trying to prove himself. [[labelnote:explanation]] The show itself has implied the latter on a few occasions. [[/labelnote]]
** Is Raph's [[TheBeastMaster skill with animals]] just a result of [[NotGoodWithPeople not being good with people,]] or is he inherently more animalistic than his brothers and father.
*** Another one would have to be on whether or not he's a StepfordSmiler in season 3 due to the events of the season 2 finale. Was he able to cope with the situation during the seasons' three month time skip, or is he just putting on a brave face because he's the TeamDad [[PromotedToParent now,]] and doesn't want the others to worry to much.
**** Yet another Raph one. (Although this one is at least partially due to [[FanPreferredCouple shipping.)]] Is Raph's negative attitude towards Donnie's crush (on April) due to his BrutallyHonest nature and being realistic over the situation (and not wanting Donnie to get hurt), or does he also have a crush on April as well but doesn't act on it because both his brother and best friend are already pursuing her, and the comments he makes are meant to dissuade himself as well. Is it just one of these, [[TakeAThirdOption or all of them?]]
** Are Casey and Donnie VitriolicBestBuds or is all their antagonism towards each other truly out of spite? [[labelnote:explanation]] "Race With the Demon" actually implies the former. [[/labelnote]]
* AbandonShipping: Back when the show first started there was a lot of support for Donnie/April. This was due to many people finding Donnie's crush endearing and him being a borderline woobie. However near the middle of the first season he went from attention seeking to what can be considered down right [[StalkerWithACrush stalking.]] This is the first thing that caused people to jump ship. Then near the end of season one he starts making increasingly [[TookALevelInDumbass stupid]] [[LoveMakesYouDumb decisions.]] Cue more people jumping ship. Then there's the fact that whenever April [[ADayInTheLimeLight gets an episode for herself]] Donnie's crush [[StrangledByTheRedString comes to the forefront]] when said [[TheyWastedAPerfectlyGoodPlot episode]] could [[TheyWastedAPerfectlyGoodCharacter have taken a lot of time to develop her character.]] This caused EVEN more people to jump ship. To make things worse in season two Donnie has a rather [[DependingOnTheWriter inconsistent]] [[ItsAllAboutMe its all about me attitude.]] (Which only seems to be around when [[DerailingLoveInterests April shows up.]])
** The ship was almost abandoned after [[DarkIsNotEvil Casey]] [[BloodKnight Jones]] has showed up. Due to A.) Being April's [[OneTruePairing most consistent love interest in the franchise.]] B.) [[RescuedFromTheScrappyHeap Becoming]] a [[EnsembleDarkhorse fan favorite]] within a few episodes. ([[DieForOurShip Even by many Donnie/April fans who once wished for his death.]]) C.) Seemingly having [[HiddenDepths having more to him than you'd think upon first meeting,]] and D.) has much more natural [[UnresolvedSexualTension chemistry with April than Donnie does]], seeming to like April for who she is instead of [[LovingAShadow the idealized beauty Donnie loves.]]
*** The season two finale made it seem that Donnie finally put aside his crush but season 3 shows the writer's insistence that the love triangle continue.
** A lot of people jumped the Leo/Karai ship when it was revealed in-universe that [[spoiler: Karai is in fact Splinter's daughter]] out of fear that [[spoiler: the mutagen made the turtles and Splinter genetically related, therefore his blood children, there for her half siblings.]] Since we don't have any confirmation on that particular subject there are still people clinging to the ship, so it's not entirely abandoned.
* AccidentalAesop: Some people view "The Croaking" as giving the message, "If you don't like being grounded, run away! You'll even become friends with NapoleonDynamite!" The fanbase was understandably... not happy.
* AlasPoorScrappy: When the Pulverizer [[spoiler: mutates into Mutagen Man.]]
* AngstWhatAngst: [[spoiler: Bradford likes his mutation into Rahzar despite it being much more horrific looking than his Dog Pound mutation, since it allowed him to regain some of his ninja speed. Subverted in "The Lonely Mutation of Baxter Stockman", where it is shown he still wants to be human again.]]
** Because a filler episode comes afterwards, April's reaction to [[spoiler:learning she's a human-Kraang mutant]] comes off as this.
** Arguably, Ice Cream Kitty. She doesn't seem bothered in the slightest about being transformed into a living dessert.
** After the much DarkerAndEdgier second season finale, the third season completely dropped the plot regarding [[spoiler: the Kraang's ongoing invasion and mutation of the Earth]] in favor of several filler episodes that are either gratiutous ShoutOut's to horror films ("Dream Beavers", "Within the Woods", "Buried Secrets"), bizarre episodes mostly focused on humor ("The Croaking", "A Foot Too Big"), or a mixture of both. Absolutely ''no'' mention of what's going on in the outside world [[spoiler: let alone the missing Splinter or their allies, or Kirby being mutated again]] is made, and overall despite the odd darker moment the show has taken a much more bizarre, lighter approach.
* {{Anvilicious}}: The moral about not letting insults get to you, to the point where Raph is blatantly portrayed as putting his "insult ignoring training" to "good use".
* AwesomeArt: The show is one of Nick's better animated CGI cartoons. The acute eye will notice subtle "blink and you'll miss it" moments about the body language of the characters and facial expressions that really help set the mood for certain scenes. The occasional 2D elements that get thrown in every so often make the show visually fun to look at.
** Then there's the fight scenes. They flow well, feel realistic, and can be both fun and exciting to watch. One of the best examples would be [[spoiler: Splinter and Shredder's fight]] at the end if season one.
* ArcFatigue: Season 3's first 8 episodes at April's farm are criticized as taking the action away from [[spoiler:the invasion of New York]], too many strange {{Filler}} episodes, and for lasting longer than is probably necessary. Part of this feeling is possibly a consequence of [[ScheduleSlip episodes being released sporadically]], though the lack of any significant plot development is a major problem as well.
* AssPull: [[spoiler: Michelangelo mixing up a bunch of random chemicals together just so happens to create the cure to the Kraang's mutagen that the Turtles have been looking for.]]
* AuthorsSavingThrow: Season 3's first few episodes seem to go to great lengths to amend the complaints toward Donatello's characterization; "A Foot Too Big" showing him his advances toward April can be seen as creepy and forceful, "Race With The Demon" re-emphasizes his role as TheSmartGuy, downplaying his romantic focus on April, and instead focusing on his banter and [[VitriolicBestBuds friendship]] with Casey. "Eyes of the Chimera" and "Vision Quest" are also ''very'' brief in their few scenes where Donatello's crush on April is apparent.
* SugarWiki/AwesomeMusic: "Follow the Leader" has one scene where the music goes all ''Series/MissionImpossible''-jazzy for an infiltration mission.
* BadassDecay: Xever, due to progressively [[OutOfFocus making less appearances]] and [[VillainDecay declining in effectiveness and being more comedic]] come Tiger Claw's arrival.
** Rahzar is getting hit with this, as he's nowhere near as big a threat as he used to be at the beginning of the series, though he's at least rarely played for laughs like Xever.
* BaseBreaker: Either Michelangelo is funnier than ever, or he's more annoying than ever.
** Mikey got hit with it hard in “The Croaking". Some people felt sympathetic towards him in the episode and were happy he gained a friend, others felt like he was acting like a spoiled brat and think the punishment he received at the beginning of the episode should have increased ten fold due to his actions. The episode also didn't help the fandom's view of April as explained below.
** Casey Jones, even before he appeared in the show!
*** Less so as we learned about his personality and motives. The fact that many [[DieForOurShip Apritello]] shippers jumped the ship around the time of his introduction probably helped.
*** However, some are turned off by his antagonistic behavior towards Donatello in season 3, all because he likes the same girl he does.
** Donatello. You either think his crush on April is cute or {{Squick}}.
** April's being [[spoiler:angry with the Turtles after they accidentally mutated her dad]] has caused either people to turn against her or explain why she's justified in acting that way. Might calm down after "Target: April O' Neil", where [[spoiler:she apologizes to the Turtles for acting like they did it on purpose and apologizing for the way she's acted to them]].
** Seth Green's voice as Leo in Season 3. Whereas Dominic Catrambone managed to sound almost exactly like Jason Biggs, Seth Green sounds nowhere near it, being borderline baritone. Some don't mind it, others do.
*** At the very least, it's given a reason for why it happened, in contrast to many other cartoons that change voice actors without the in-universe characters noting the change: [[spoiler:Shredder damaged his vocal chords to the point of being unrepairable.]]
** [[spoiler: Karai's]] mutation. Some fans hate it due to the fact that it came up simply to keep [[spoiler: her and Splinter]] apart per the [[StatusQuoIsGod status quo]]. Others hate it due to it being a heavy change to the show's canon since [[spoiler: Karai]] has never been a mutant in any other iteration of the series, with some feeling it's a cheap gimmick of adding yet another mutant to the [[MerchandiseDriven toyline]], not helped by the fact that a figure was indeed announced not long after the change happened. Others are fine with it, as long as they feel it can be eventually cured down the line.
** Tiger Claw is either awesome or a VillainSue depending on who you ask.
** The end of "A Foot Too Big" where after Donnie comes to the realization that he's been too much of a StalkerWithACrush towards April and apologizes, saying he'll lay off [[spoiler: and then she kisses him on the lips.]] some fans are crying foul about the mixed messages April's giving by her response, others are happy for their ship, and still others are just pissed off at the writers/execs for clearly trying to drag out the love triangle.
*** April manages to do it again just two episodes later in “The Croaking" in which she acts as an instigator towards Mikey's bad behaviour. Kid trashes the house multiple times (making a mess with thrown around food, waisting said food, AND breaking furniture) in which his brothers understandably get mad and [[TeamDad Raph leaves him to clean up the mess.]] When Mikey [[spoiler: runs away from the group]] April blames every other member but herself, trying to claim the event was caused by mistreatment that [[UnreliableNarrator was never shown onscreen.]] She then takes it a step further and unrightfully yells at Raph for being “inconsiderate", despite the fact he had to take up a lot of responsibility after [[WhamEpisode the season two finale]] and was acting as a ReasonableAuthorityFigure when he decided to make Mikey clean up his mess. All of this and the fact that her words seemed to genuinely hurt [[EnsembleDarkhorse Raph]] has caused... negative reactions to say the least.
**** April as a whole has been displaying a very self-righteous nature since season 2, which has only been getting worse in season 3, that many fans find unjustified. Given she's also tied to an extremely [[StrangledByTheRedString obnoxious love triangle]] and has gotten little character development outside of the love triangle her standing in the eyes of the fandom is shaky at best.
** As noted above, the complete dropping of the [[spoiler: Kraang invasion of the world]] plot line in season three in favor of filler episodes with little emphasis on ongoing plots besides Leo's recovery of the Donnie/April/Casey love triangle.
** Hun's appearance, attitude, and fighting technique being incredibly different from his previous incarnation has resulted in complaints, mostly being that [[InNameOnly he seems to be a new character entirely, but uses a pre-existing name]].
** There have been complaints that the show could get better mileage out of having more human antagonists, instead of what is an almost exclusively mutant RoguesGallery. Not helped by the fact that almost all human villains eventually get mutated down the line, [[spoiler:including those (like Karai) who didn't in any of the previous incarnations]].
* BigLippedAlligatorMoment: A mildly disturbing occurs in Fungus Humongus: After Leo gets sprayed with spore and starts seeing his fear, we're all treated to a random scene of all the mushrooms dancing to the Nutcracker Suite. However, it does break the tension briefly of one of the more disturbing episodes.
** The ending shows one of the mushrooms on Mikey's pizza getting up and dancing.
** Also the cheese phone from The Manhattan Project.
** Slash's ability to perfectly mimic Leonardo's voice and silhouette.
* BizarroEpisode: Even by this shows standards, "Pizza Face" is just...out there.
** A close second in weirdness is "A Foot Too Big". To-wit: The Turtles find Bigfoot, Bigfoot falls in love with Donnie and a psycho hunter who talks to his mothers ShrunkenHead is after them.
* BrokenBase:
** People either love the new personalities for the Turtles, or think it's crap.
*** Broadly speaking, their personalities still line up with both previous shows' [[ExpositoryThemeTune theme songs]]. The biggest change is Donatello having a crush on young teen April (and Raphael is somewhere between the 1987 and 2003 shows on the anger scale).
** The quality of this version of the turtles is arguably the most divided when it comes to the fans reactions of the whole franchise.
** The [[DivergentCharacterEvolution reworked designs]] of the Turtles seem to be something of a point of contention among a few fans.
** Fans are also divided over whether or not it is a good thing that [[spoiler:Spike became Slash]].
** Season 2 seems to have divided fans. There are those who see it as GrowingTheBeard, and there are others that feel that while the season has some good episodes, it also has a few pacing issues, such as resolving plots too quickly, having perhaps too many filler episodes, some of which are [[DenserAndWackier very goofy]] and at odds with the [[DarkerAndEdgier slightly darker tone]] that the season was going for in its first few episodes.
** While fans rejoiced that Bebop and Rocksteady are finally appearing, they are heavily divided over 2 things. The first is their [[http://img3.wikia.nocookie.net/__cb20140501013812/tmnt/images/a/ab/Bebop%26Rocksteady.jpg drastically different character designs]]. The second thing is the fact that they're completely different characters from the other versions. Basically, instead of the loveable idiots from the 80's and comics universes, Bebop is an eccentric hi-tech thief who speaks in slang, and Rocksteady is a Russian arms dealer, who is also a collector of antique military weapons, and is after Shredder's helmet.
** The reveal in "The Invasion, Part 1" that Irma [[spoiler: was really a Kraang spy. Some found the twist funny, while others hated it because it came completely out of nowhere with no foreshadowing except for one part in the previous episode. It requires a lot of suspension of disbelief to buy that she was a robot the entire time and a lot of die hard Irma fans are clinging on to the theory that the real Irma was replaced by a robot until WordOfGod proves otherwise.]]
** The fact that the Kraang as a whole have seem to have replaced long time BigBad Shredder as the main villain of the entire series.
** Renet being announced as an incoming character hasn't been so much of a BaseBreaker as much as the announcement that she'd be Mikey's love interest has. Some don't mind it (Renet/Mikey was already a popular ship) but others don't like how almost every female character (except Irma) becomes a love interest to one of the turtles.
** The show being much more heavily MerchandiseDriven, and seeing as that influenced both of the previous TMNT cartoons that's saying a lot. Every single episode either introduces a new mutant or mutates a previously established character [[spoiler: even if they're already a mutant in characters like Bradford's case]], and even ones that don't somehow find a way to get a new form or costume in for one of the characters which appear in the toyline a few months later. While not so bad in more story-centric episodes, it also has led to many MonsterOfTheWeek filler episodes, most infamously the first third of season 3, which derail the story completely just to bring in yet another mutant. Combine that with the number of times the show has gone on hiatus and it's led many people to start losing interest.
* CargoShip: As per usual fans jokingly ship the turtles with their [[WeaponofChoice weapons of choice.]] However this series has provided multiple new ones.
** Splinter+The empty broken mutagen canister Mikey called "mom."
** Raph+Wooden Spoon
** Leo+Karai's throwing knife.
** Donnie+Metalhead.
** Mikey+Smoke bombs.
* CharacterRerailment: [[spoiler:One of the most consistent problems that were had with ''WesternAnimation/TurtlesForever'' was the CharacterExaggeration the 1987 Turtles went through, save particular quirks, where they were portrayed as being a bit ''[[DenserAndWackier too]]'' silly and too similar. Their brief appearances in "The Manhattan Project" dial back the silliness and uses the characterizations more common to the 1987 series.]]
** Some people view "Race With the Demon" as this for Donnie and Casey. Whether it lasts is up in the air.
** Donnie seemingly gets some CharacterDevelopment in ''A Foot Too Big'' (Season 3, episode 2), and, as of Season 3, Episode 8, it seems to be ''sticking'': After Donnie promises to not bug April anymore and [[spoiler: April kisses Donnie, telling him that he's not just "a mutant", he's "her mutant"]] his [[StalkerWithACrush more stalker-y]] tendencies all but disappear, and he reverts back to his early-Season-1 persona in regards to her, if not more subdued, making the attraction cute again. He does still have occasional moments of jealousy towards Casey, but he noticeably pulls back much more and lets April do her own thing.
** Despite just being a spirit to test Raphael in "Spirit Quest", Xever is treated more respectfully and as an ArchEnemy to Raphael rather than the joke he became in Season 2. And while he doesn't face off against Raphael in "Serpent Hunt", he wins his fight against Anton Zeck via cunning, along with displaying the dark wit he had in Season 1.
** On a meta level, this Show does this with their versions of Bebop and Rocksteady. Their origins and designs are different, but they're portrayed as closer to their their original characterization of comical bad guys who can still be a serious threat to the turtles rather than as the total doofuses they became after {{Flanderization}} sunk in.
* CompleteMonster: This continuity’s Rat King, [[Main/MorallyAmbiguousDoctorate Dr. Victor Falco]], started off as just a [[SmugSnake smug]] {{mad scientist}}. The Turtles first meet him while investigating the disappearance of another scientist, with Falco [[Main/BitchInSheepsClothing seeming very friendly, helpful and concerned with his colleague's well being]]. However it is soon revealed that Falco himself kidnapped his colleague, mutating him into a gorilla creature and is using his mutated DNA to create a serum that gives himself PsychicPowers. After his initial defeat by the Turtles, Falco loses his job and continues his experiments on rats. An accident leaves him blind and deformed, but also grants him the ability to [[Main/TheBeastmaster control rats]]. Falco becomes [[Main/MisanthropeSupreme disgusted with humanity]], adopts the name Rat King and seeks to have his rats take over the city by driving the humans away. Rat King also [[MindRape mind rapes]] Splinter several times, in order to break his spirit and turn him into his slave. After another defeat, Rat King later returns again, kidnaps several civilians, [[WouldHurtAChild including a couple of teenagers and a small girl]] and plans to experiment on them, trying to turn them into human rat hybrids. However his first attempt results in a creature that is deformed, immobile and in constant pain, but that does not deter him from continuing his experiments. Also despite his supposed kinship with his rats, [[{{Hypocrite}} he has no problem experimenting on them and is willing sacrifice them to gain an advantage over one of his enemies]].
* ContinuityLockOut: The first season alone demonstrates this, due to the fact that episodes build on each other, lack of PreviouslyOn segments (though the opener may explain), and not really explaining things as well as they could for viewers who have missed an episode or are just starting (though Nick.com is kind enough to leave episodes up for a few weeks just in case viewers missed them).
* CrackShip: Donatello/April shippers and Casey/April shippers have been at each other's throats since the first episode. Those who have been annoyed by their behavior have started shipping Casey/Donatello to troll them for their irrational behavior.
** April/Raphael to a lesser, yet somehow still understandable, degree.
* CrazyAwesome: Anton Zeck could rival SelfDemonstrating/{{Deadpool}} in being a looney, unpredictable DanceBattler who never shuts up, yet is incredibly good at what he does as well as being lots of fun to watch. [[spoiler: Especially after he's turned into Bebop.]]
* CreepyAwesome: The Rat King.
* DamselScrappy: April seems to keep on becoming the DamselInDistress despite her alleged kunoichi training, and by mid-Season 2 it's starting to wear thin on some viewers. The episode "Mutants and Monsters" even pokes fun at the trend by making an illusionary April play the part of a PrincessClassic needing to be saved.
** Kirby has started to become this by the end of the second season, [[StatusQuoIsGod as something always comes up to keep him and April apart for most of the series]]. Twice in the series the Turtles have finally managed to save him as part of an over-arching plotline only for him to wind up getting in trouble again not long after, [[spoiler: both times due to getting mutated.]] By this point, some fans have lost interest in him, feeling that even though he'll eventually be saved later he'll only be inevitably either captured or [[spoiler: mutated]] once more in time for season four to do the whole thing over again.
* DieForOurShip: Casey Jones has been hit with this by many April/Donatello shippers.
** This reaches into Fandumb territory as some April/Donnie shippers have declared the show of losing "quality" and have declared they will not watch it anymore... simply for the ship teasing of the (almost always canon) Casey/April ship.
* DudeNotFunny: The turtles laughing at Donnie and making puns at his expense after getting beaten up by Dr. Rockwell in ''Monkey Brains''.
** The turtles accidentally almost killing Splinter with Donnie's naginata in ''I, Monster''. This type of close call situation can be funny if the character is perfectly healthy, not when the character is currently being subject to mind rape and subsequent mental pain.
* EarWorm: The theme song; seems to be a tradition in the TMNT franchise.
* EnsembleDarkhorse:
** This show's version of Karai has developed a following. Her loyalty to the Shredder/Foot is downplayed, her [[DeadpanSnarker snarks]] are hilarious, and her ShipTease with [[DatingCatwoman Leo]] helps (or [[{{Squick}} doesn't]]).
** Xever/Fishface is slightly more popular than his partner Chris Bradford/Dogpound, due in part to having a more [[DanceBattler visually appealing, unique fighting style]]. It probably helps that the audience learns far more about him than they've learned about his partner.
** Spike and Murakami, thanks to being a funny background critter and a CoolOldGuy respectively..
** Despite starting out as TheScrappy (mostly due to shipping), Casey has since become a fan favorite.
** Out of the four turtles Raphael seems to be the favorite, possibly due to his HiddenDepths and being a FountainOfMemes. Second to Raphael would possibly have to be Leonardo, who not only has been RescuedFromTheScrappyHeap compared to his previous incarnations, but is generally considered to be one of the least obnoxious turtles with his love of cartoons and focus on learning to be a leader being positive highlights.
** Starting out as divided when people found out about the character [[spoiler:Slash]] is now very well liked due to being portrayed as a cunning, genuine threat who provides interesting tension with [[spoiler:Raphael]].
** Ice Cream Kitty seems to have developed a following.
** Tiger Claw has some of this due to being a Badass bounty hunter who puts up a brutal fight with the turtles.
** Kraang Sub-Prime, for finally giving this show a Kraang in the style of Krang from the 80s cartoon.
** Bebop and Rocksteady, two old fan favorites from the old show, now remade into more dangerous villains with richer personalities than ever before.
* FamilyUnfriendlyAesop:
** In "New Friend, Old Enemy", Splinter teaches Leonardo that victory is more important than fairness. Granted, he's talking about fighting (potentially) ''to the death'', but perhaps they should have clarified that to the kids watching.
** From Episode 5:
--->'''Splinter''': The first rule of being a ninja is, [[MartialPacifist "Do no harm."]] [[BrokenAesop Unless you mean to do harm.]] [[FamilyUnfriendlyAesop Then do]] ''[[FamilyUnfriendlyAesop lots]]'' [[FamilyUnfriendlyAesop of harm.]]
** ''New Girl in Town'' has Splinter deliver a message to Leonardo that leadership is a hard, thankless task, and he should not think otherwise.
** Some fans cite this as a meta-reason why the creators may avoid the April/Casey pairing, or just leave the LoveTriangle [[UnresolvedSexualTension entirely unresolved]]: the general message of Donnie and April's relationship would then be "[[TheGrotesque you'll never be loved if you're different]]," and that... is probably not something you should be teaching kids, for a whole myriad of reasons.
* FanonDiscontinuity: Some people like to pretend [[spoiler: Irma's true nature as Kraang Sub-Prime]] never happened.
* FanPreferredCouple: April/Raph ever since the creators released old concept art of the the two dancing together. (Raph noticeably had hearts in his eyes and the writers even went so far as to confirm that they were originally going to be love interests.) Basically due to Casey being a bit of a perv and Donnie being [[StalkerWithACrush down right creepy]] at times support for this pairing has skyrocketed.
** April/Leo also has quite the following. This is mostly due to April having far more interaction with him than the other turtles sans Donnie. The support for this pairing may increase following the Narmtastic moment below from "Eyes of the Chimera."
* FoeYay: Leo and Karai. April and Raphael clearly do not approve of this development.
** April and Karai have some too. "Miss me, princess?"
** [[spoiler:Slash]] and Raphael almost have shades of this too, particularly since the former is ''completely obsessed'' [[WeCanRuleTogether with getting Raphael on his side]], and wants to [[MurderTheHypotenuse kill all of Raph's brothers so that he can have Raph for himself]].
* FountainOfMemes: Suprisingly enough this version of Raphael has been the source of most of the show's memes.
* GeniusBonus[=/=]FridgeBrilliance: In Episode 13, the Rat King wears an outfit nearly identical to the ones worn by medieval [[PlagueDoctor Plague doctors]] (long black coat and black wide-brimmed hat). The Bubonic plague was spread (partly) because of fleas being carried by ''rats''.
** In Leatherhead's first episode,he grabs one of the turtles and starts spinning. A grab-and-roll is a tactic used by real life alligators to take down their prey.
* GrowingTheBeard:
** The tone of the show became more focused and consistent mid-first season, starting with "The Gauntlet", the arcs that were previously only hinted at or set up became more prominent, and mostly dropped the MonsterOfTheWeek format. Later in Season 1, Karai's introduction upshot an interesting dynamic with Leonardo, some new and interesting setpieces were introduced, and the fight scenes and animation [[ArtEvolution becoming far more consistent and fluid]]. Season 2 did [[SeasonalRot backpedal]], though.
** While Season 3 has its issues such as [[ArcFatigue rather boring filler at April's farm]], "Spirit Quest" and "Return To New York" have much stronger pacing and have thus far ''stayed'' at the central arc ([[spoiler:taking New York back from the Kraang]]), creating a much stronger narrative.
* HarsherInHindsight: At the beginning of ''Rise of the Turtles Part 2'', Mikey wants to drink some mutagen, but Don points out that it may turn him into a pile of goo. Fast forward to ''The Pulverizer Returns''....
** Also fast forward to ''Mikey Gets Shellacne'' where we see what happens when Mikey ''does'' use more mutagen on himself.
** Any moment between [[spoiler: Raphael and his pet turtle, Spike,]] become this after [[spoiler: Spike mutates into Slash.]]
** Any moment that [[spoiler: Irma]] is on-screen becomes this after the reveal that [[spoiler: Irma is a Kraang in disguise who became April's friend in order to get April to lead her to the turtles]]. You can see how everything this character says is a subtle manipulation [[spoiler: to earn April's trust in her, and sometimes to erode April's trust in others, such as Casey]]. Every little quirk is a foreshadowing of what this character really is, such as [[spoiler: her encyclopedic knowledge of the behaviors of rats, an innocent enough interest for a Perky Goth, but also something valuable when tracking Master Splinter]]. Or [[spoiler: the gluten-free diet a Kraangbot mentions in passing, when Irma is the only prominent "human" character to stick to the same diet]].
** The line in the theme song describing Leonardo, "[[HeroicSacrifice does anything it takes]] [[BigBrotherInstinct to get his ninjas through]]", becomes a lot heavier after the season 2 finale.
* HeReallyCanAct: While CoreyFeldman isn't a ''bad'' actor, nobody expected how intimidating he was as Slash.
* HilariousInHindsight: Donatello/April and Leonardo/Karai were both [[{{Shipping}} ships]] that only received mere [[ShipTease teasing]] in the ''[[WesternAnimation/TeenageMutantNinjaTurtles2003 2003 series]]'' rather than anything serious. This series takes those teases and makes them officially acknowledged in-universe.
** Donatello and Casey's friendly rivalry and name calling in the ''[[Film/TeenageMutantNinjaTurtles 1990 film]]'', all of a sudden becomes a lot funnier now that the two have received DieForOurShip between those who pair them with April in this series.
** A scene with TheElevatorFromIpanema involves a SuspiciouslySimilarSong to "Hooked on a Feeling" (Bossa Nova remix), which is especially funny after [[Film/GuardiansOfTheGalaxy another unorthodox superhero team]] [[MemeticMutation made it famous.]]
** In the 2003 cartoon's Fast Forward era, the turtles must fight evil clones of themselves. Donatello's evil clone is the tallest and skinniest of the 4 evil turtles, much like the 2012 version of Donatello, while Raphael's evil clone is the shortest reflecting Raphael's 2012 design being shorter than Leonardo and Donatello, and Michelangelo's evil clone is basically a nincompoop who barely makes sense to reflect the 2012 version of Mikey's Flanderized [[TookALevelInDumbass stupidity]].
* HolyShitQuotient: The season 2 finale. The Kraang successfully invade New York, [[spoiler:Irma turns out to be a Kraang [[TheMole Mole]], most of the population gets mutated (including April's dad ''again''), Splinter is defeated and left for dead by Shredder and the iconic part about the Turtles losing their lair, forcing them to hide in the country, with Leo being broken gets an adaptation]].
* HoYay: Mikey and Leatherhead in "It Came From The Depths".
** Irma seems to be just as jealous of Casey and possessive of April as Donnie is.
** [[spoiler:Becomes a little squicky when you realize that Irma is a little less Goth and a little more... [[Creator/GilbertGottfried Gottfried]]]].
** Donnie and Casey get quite a few moments in "Race With the Demon" including one where Casey admits to going after the Speed Demon without Donnie in a way that sounds like apologizing for cheating.
* IdiotPlot: "Mikey Gets Shellacne" is started by Michelangelo using prototype Retro-Mutagen on himself, which will have the side effect of making him explode due to the incompleteness of it, because he completely ignored the labels telling him ''not to use it''. To a more minor extent, the other characters ignore Mikey thanks to him messing up when he says that Baxter is probably at his lab, which, considering Baxter's personality, [[DumbassHasAPoint actually wouldn't be very far-off]]. The entire episode ends up resulting in [[spoiler:a far more powerful Chris Bradford, who mutated into Rahzar thanks to it]].
** There's also the previous episode, ''Mutagen Man Unleashed''. Donnie's lust for April combined with her falling out results in Donnie endlessly ranting which at least partially contributes to Pulverizer's insanity. Splinter had the time to teach Donnie that he can't just make April like him, but for some reason neglects to teach him that a romantic relationship between them wouldn't work due to them being different species. Then Pulverizer is somehow able to make his mouth appendage leave the container he's in and drink more mutagen allowing him the strength to escape, no explanation given as to how he managed to get his mouth out of the container he's stuck in or why Donnie didn't notice that his mutagen supply was depleting. The kicker comes in when Donnie tries to defend Pulverizer's actions stating he was only trying to let them reconcile with April. Pulverizer then tells them he wanted April for himself and blames the turtles for turning him into Mutagen Man when it was clearly his own fault (great, another instance where the turtles are blamed for something that wasn't their fault, by the perpetrator no less). Even after all this, Donnie still defends Pulverizer's actions and gives his brothers a reason to keep him since he believes Pulverizer's DNA as Mutagen Man might help him discover a cure for him and April's dad. However, by the time a cure is discovered, it was April's DNA that unlocked the answer, not Pulverizer. About the only thing that stopped this from being an avoidable filler episode was Casey's debut.
** The less that is said about "The Croaking" the better.
* InferredHolocaust: The Kraang's invasion in the season 2 finale is ''full'' of this.
* IronWoobie: Poor Splinter. But even though he keeps getting kicked down by life, he refuses to ''stay'' down, picking himself up and continuing on.
** Leonardo, so very much. It's clear that being leader is a very thankless job, seeing as no matter how many times he proves himself, his brothers only tend to listen to him when they feel like it. Despite that, he does a really good job keeping them united, and he's always there to save their shells. His number one priority is to keep his family safe, even if he has to sacrifice himself to do it.
** On the more comedic side of this trope, we have Mikey, who's basically a punching bag, both physically and verbally for his brothers. Doesn't stop him from being who he is though.
* JerkassWoobie: Raph in Cockroach Terminator. Raph shows that he's clearly afraid of regular cockroaches, but then he has to put up with a mutant cockroach and the other turtles are absolutely no help since they either make fun of him or don't give him any sympathy.
** Happens to him again in season 2 [[spoiler: when Spike becomes Slash, hurts his brothers, and has to fight him. The ending where Raph is looking at a chewed up leaf really sends the message that his best friend is gone and has turned into a monster]].
** [[spoiler: As of the season finale, Karai now qualifies, as she is actually Splinter's daughter and has been lied to her whole life by Shredder, and she ''still'' thinks that Splinter's the one who killed her mother and wants vengeance.]]
*** [[spoiler: The ending of Wormquake/The Manhattan Project shows her eavesdropping on the heroes, where April is in disbelief that Karai's actually Splinter's daughter. Splinter states that Karai might believe the truth one day, but its ultimately her decision.]]
*** [[spoiler: It gets worse for the poor girl once she DOES believe the truth in "The Wrath of Tiger Claw" and "Vengeance is Mine".]]
** Arguably [[spoiler:Spike, while he did try and murder the turtles he genuinely believed he was helping Raph... it's kinda hard NOT to feel bad for him when Raph calls him a monster.]]
*** Briefly comes back during the ''Battle For New York'' special due to Leo's distrust and when he doubts himself as leader when the Kraang force the Mighty Mutanimals into surrendering.
** Baxter Stockman in his more pathetic moments can be this. [[spoiler:And it gets worse after his mutation, as it drove him over the edge, and all he wants is to be normal again.]]
** Casey in ''Casey Jones vs. the Underworld'' when the turtles laugh at him for losing to the Purple Dragons. Then again, he did underestimate Hun and didn't bother telling the turtles about him.
* LauncherOfAThousandShips: Raphael. Dear god, Raphael. He's been shipped with [[CargoShip his weapon, a wooden spoon,]] [[FanPreferredCouple April]], [[IncestIsRelative his brothers,]] [[HoYay Casey]], [[FoeYay Bradford, Xever, Slash, Karai,]] [[ShipsThatPassInTheNight Irma]], [[UpToEleven and even characters who haven't even appeared yet like Mona Lisa, Venus, and Ninjara.]] To make things better he has shown absolutely no romantic interest in any of these characters that he's actually met, effectively making each and every one of these [[CrackPairing crack pairings.]]
** We can now add cleaning supplies to this list.
*** It would be easier to list who he isn't being shipped with.
* LikeYouWouldReallyDoIt: It was rumored that Karai was possibly getting mutated, which was scoffed at, as even with the various liberties taken with the series, they most likely wouldn't mutate a major series mainstay. [[spoiler:Averted when they went through with it.]]
* MemeticMolester: Both Donnie and Casey.
** Bigfoot as well.
* MemeticMutation: Booyakasha!
** That which is the way the Kraang speak has become mutated by that which is known as the Internet into what is known as a meme.
** The term "sadorable" has become extremely popular on Deviantart.
** A certain preview for the two part finale for season one shows the turtles and April having a little dance party. All three dances shown has become a bit memetic. So you know it shows Leo shuffling. Donnie and April, of all dances they could of done, doing the funky chicken. Then Raph's dance, which might be the most memetic of all.
** "[Insert character name here] confirmed for season 2!" (To the point where fans will search for the most obscure characters possible to keep the joke going.) It'll probably die down once season 2 actually comes along though.[[labelnote:explanation]]This originated from the writers announcing that Casey Jones would appear in season two before season one even aired.[[/labelnote]]
** '''''"I NEVER WANT TO SEE YOU AGAIN!!!"'''''[[labelnote:explanation]][[DarkerAndEdgier April to the Turtles after they (accidentally)]] [[{{Deconstruction}} caused her father to become a mutant]].[[/labelnote]]
** Buzz buzz. [[labelnote:explanation]]Michelangelo says this in the first episode of Season 2 when dressed like a butterfly/moth.[[/labelnote]]
** The costumes the turtles (and April) wore in the Halloween game featured on the Nick website. Especially Raph's [[spoiler: fairy princess outfit.]]
** Raphael: KING OF ALL PIGEONS!!![[labelnote:explanation]]In "Follow The Leader", Raphael, using one pigeon, ''[[TheBeastmaster gets an entire flock of them]]'' to help assist in a stealth mission.[[/labelnote]]
** "[X] on your [Y] if you [Z]."
** [[ItMakesJustAsMuchSenseInContext "Bigfoot's got some moves."]] [[labelnote:explanation]] The now infamous Raph line from [[BizarroEpisode "A Foot To Big"]] during his fight with Bigfoot. [[/labelnote]]
** Daddy Raphie! [[labelnote:explanation]] Raphael got a PromotionToParent between season 2 and 3. The fanbase exploded. [[/labelnote]]
** [[http://asktmnt.tumblr.com/ This fanmade ask blog]] has spanned several. One post created [[UpToEleven about five at once.]]
---> '''Raph (pretending to be Donnie):''' April's like an F5 key-- She's so refreshing.
---> '''Leo (pretending to be Mikey):''' OMG, you guys! Check out this giant gummy bear I found at the landfill! (Starts chewing at it wildly.)
*** Earlier in the same post is Mikey and Donnie acting out a mock fight between Leo and Raph respectively. The funny thing is it's pretty accurate to their relationship/arguments in other continuities.
--->'''Donnie (pretending to be Raph):''' You're always holding me back, Leo!! You don't understand me!
--->'''Mikey, in reply to the above. (While pretending to be Leo):''' Uhhh, wait, Raph, I've stopped caring.
*** Earlier still.
--->'''Mikey (pretending to be Leo):''' I'm Leo. I enjoy fangirling and being serious.
*** What class is Casey the teacher of? [[http://asktmnt.tumblr.com/post/68688319149/during-class Pain 101!]]
*** [[CrowningMomentOfHeartwarming Turtles and Strawberries.]]
*** The fact that the anon is [[http://asktmnt.tumblr.com/post/89095200320/with-all-the-love-confessions-boyfriend-requests seriously considering keeping a tally of all the fangirls who try to ask Leo and Raph out as a contest between the two.]]
*** Depicting the boys dressing up as [[spoiler: April]], as seen [[http://asktmnt.tumblr.com/post/64979578571/we-could-totally-be-twins-april-mikey-do here.]]
** [[CargoShip Raphael and cleaning products.]] [[labelnote:explanation]] The fandom has noticed very minor scenes that indicate Raph is all around cleaner than his brother [[SeriousBusiness and have flanderized it beyond belief.]] [[/labelnote]]
** [[BigLippedAlligatorMoment The Cheese Phone, truly an emergency!]]
** "Don't Casetello me, bro!", "My Casetello vibes are tingling", and it's variants to a lesser agree. [[labelnote:explanation]] Casetello is the ship name for Casey/Donnie. Since both characters are [[MemeticMolester memetic molesters]] these phrases are often used between fans to indicate that a second party is doing/acting/saying something creepy. [[/labelnote]]
** Captain Ryan/Captain Dash Coolstar/Leonardo slapping people.
** How did he build that? [[labelnote:explanation]] First used in reference to Casey's seeimingly endless ability to macguyver house hold objects into deadly weapons, and brought back to life when Raphael somehow managed to make duo flamethrowers with junk he found in the woods.[[/labelnote]]
** "Raphael is BEST Disney princess" [[labelnote:explanation]] A combination of the above "Pigeon King" and Halloween costume memes [[/labelnote]]
** [[BadFuture SAINW]], [[BigNo nooooooooo!]] [[labelnote:explanation]] The show has seemingly referenced the infamously sad/traumatizing 2K3 episode, "Same As It Never Was" several times. Fans have reacted appropriately. [[/labelnote]]
** Nightwatcher or Riot! [[labelnote:explanation]] Raph's Nighwatcher persona that was introduced in the '07 movie is notoriously popular within the fandom, and many a fan wishes to see this Raph become Nightwatcher.[[/labelnote]]
** Casey Jones: First psychotic human friend! [[labelnote:explanation]] One of the many comments written on his concept art by the show runners. [[/labelnote]]
* MemeticSexGod: Thanks to his dance, Raphael is now considered this.
** Karai and April to a much lesser extent.
* MoralEventHorizon: Shredder killed Hamato Yoshi's (this was before he was mutated and started calling himself Splinter) [[spoiler: wife, burned his house down and kidnapped Yoshi's daughter Miwa to raise as his own, naming her Karai (meaning "weapon"), blaming Yoshi for murdering her mother, and making Karai hate her biological father. Why did he do all this? Essentially because he was jealous of Yoshi.]]
** What makes this even worse is that [[spoiler:he's outright shown he has not compassion at all for Karai. She's simply a means to an end. Even the fact she genuinely loves him means nothing so long as he can use her to hurt Splinter.]] The big crossing in this regard comes when he [[spoiler:responds to her asking if Splinter is her real father by saying yes and having her locked up. No show of sorrow or upset. No feelings of remorse. He just basically tells her 'yes, I used you as a living tool of revenge and discards her.]]
*** Him [[spoiler:blaming Splinter for Karai's mutation]] probably counts as a better example, but for different reasons. [[spoiler:Her mutation was more or less ''entirely'' his own fault, with Splinter having nothing to do with it.]] In a way, [[spoiler:Shredder actually caring about Karai]] makes it ''worse'' because [[spoiler:instead of going MyGodWhatHaveIDone, he uses it as more fuel for his hunger for revenge instead of accepting responsibility for his actions.]]
** Spike at first came off as a WellIntentionedExtremist because [[spoiler: Raph was mad at his brothers]]. However, he crossed it when he not only ignored [[spoiler: Raph's pleas to not hurt the other turtles, but went after him too]].
** While his first appearance wasn't exactly not crossing it, [[spoiler:The Rat King crossed it in "I Monster" where he sicked a mind controlled Splinter to kill the turtles]].
* {{Narm}}: Mikey calling [[spoiler: Kirby "Wing Nut" after he's been mutated into a bat and the turtles are trying to trap him.]] Which is lampshaded by Donnie.
-->'''Donnie''': You are not giving [[spoiler: Mr. O'Neil a monster name!]]
** Slash's fingernails can [[WolverineClaws extend to puncture or slash at his enemies]]. The result isn't as threatening as it is strange.
** April's [[spoiler:attack on Mom-Thing in ''Buried Secrets''.]]
** In "Eyes of the Chimera" April experiences HorrorHunger due to having a psychic link to the aforementioned Chimera. Since Leo is the only one around she tries to eat him... but the dialog she's given and her VA's delivery makes the whole event sound incredibly like she's trying to make sexual advancements towards Leo. The fact that Leo's VA doesn't even try to make Leo sound all that frightened makes it look like he's only halfheartedly shooting her advancements down. Hell, if you take the scene out of context it wouldn't be surprising if you legitimately thought they were a couple and Leo didn't want to let her "eat him" because he has a headache or something.
* NarmCharm: The frog crying in "The Croaking". It's so cheesy yet you can't help but feel upset after it happens.
* NauseaFuel: Mikey's shell acne throughout the whole episode of ''Mikey Gets Shell Acne''.
** Baxter Fly, being part fly, needs to vomit on food before eating it. He also eats garbage.
** Some of the toppings Mikey used for his home made pizza in ''Pizza Face'' has a clump of dirt with worms (and it looks like he got it from a trash bin), a rat carcass, and an eyeball.
** Steranko eating a cockroach. Granted, it makes sense considering he's out of food thanks to the alien invasion, but still there was no need to actually show it. Likewise, Mikey mistakes some of [[spoiler: Karai's scales]] for potato chips and eats them.
* NeverLiveItDown: Donnie is never going to live down his StalkerWithACrush tendencies before his rerailment in many parts of the fandom.
* NightmareFuel: Fungus Humongus was a disturbing episode and probably viewed with discretion if you're afraid of rats or cockroaches as the visuals (especially with the roaches) can be frightful. Also deals with different fears such as phobias of things or personal dreads of failure as a leader or rejection out of anxiety and guilt.
* NightmareRetardant: While there is a certain paranoia factor to the Kraang, the [[DepartmentOfRedundancyDepartment "place" where they speak]] creates a difficult "place" with the "place" where they are taken in the serious "place". They can however be surprisingly frightening when they drop that.
** Although this ''can'' be made sinister when they want it to: "The turtles must be eliminated from this place, and ''all other places''."
** As horrifying as [[spoiler: the Pulverizer's mutation into Mutagen Man]] is, there's just something hard to take seriously about his high-pitched voice when he screams "It burns!"
** [[spoiler: Kraang Primes's]] voice was this for many people. Perhaps inevitable, considering that they were voiced by Roseanne Barr, who is known as a comedian first and the casting choice [[WTHCastingAgency was considered pretty strange to begin with]].
** Much of the scare factor from "Fungus Humongous" can be ruined due to the fact that, aside from Leonardo, April, and ''maybe'' Casey, if you're a musophobic, the other Turtles' fears and hallucinations are done in a manner too over-the-top or silly to be taken seriously, with Donatello possibly being the worst offender, as his hallucinations of April rejecting him is done in the same {{Animesque}}, exaggerated style as the rest of the series.
* OlderThanTheyThink: A few watchers have commented on the apparent "change" for Splinter to train April in martial arts. It's likely most of the commentators are only familiar with her [[WesternAnimation/TeenageMutantNinjaTurtles1987 80s cartoon counterpart]], who was essentially always a DistressedDamsel. Otherwise, they're a few comic series, [[WesternAnimation/TeenageMutantNinjaTurtles2003 one previous animated series]], and [[WesternAnimation/{{TMNT}} a feature film]] late to that development.
* OneSceneWonder: The Dracodroid; it's a two-headed robot dragon that's also a lightning-shooting jet!
* RelationshipWritingFumble: Minor case. While it's undeniable that Raph's dere moments towards his brothers are heartwarming, a few of the ones with Mikey unintentionally came off as something else to some of the viewers. As stated above it's not nearly as bad as most other examples of the trope despite it having been noticed. Whenever it DOES happen fans shrug it off as them being closer together than they are with Donnie or Leo, which is indeed true in most continuities.
** Casey and Donnie's rivalry over April sometimes looks more like UST rather than actual rivalry. Unlike the above this has caused shipping.
*** "Race With the Demon" [[PunctuatedForEmphasis did. Not. Help.]] Instead of coming off as two friends getting in an argument over their mutual crush and slowly making up over the course of the episode it comes off like they're a couple who are getting over the fact that one of them (Casey) cheated on the other (Donnie). The fact that April is entirely unconcerned if annoyed and [[ShippingGoggles has a bit of a]] [[FanPreferredCouple moment with Raphael]] makes this even more jarring. Casey and Donnie even argue LikeAnOldMarriedCouple and have a good-natured insult game.
** April with BOTH Raph and Leo on several occasions.
*** For some people Raph's distaste of Donnie liking April comes off as jelousy and angst rather than him trying to be a good (if overly blunt) big brother by helping him let go of a crush. They also had a few small moments during the first two seasons. In season 3 April shows no interest in either Casey or Donnie (the people who are suppose to be her love interests) and even gets annoyed and angry over some of their advances, whereas she'll later be shown acting rather casual with Raph. The aforementioned "Race With the Demon" had April affectionatly lean on Raph at the end after both make a crack at the HoYay antics of Casey and Donnie. Lastly there's her blowing up at Raph in "The Coaking" over Mikey, which some fans have said looked like two stressed parents arguing over their... Well, their parenting methods.
*** As for Leo, many fans have said that he has much natural chemistry with her than Donnie does. They're shown to get along well and seem fairly close. Then "Eyes of the Chimera" came out and fans almost immediately dubbed it, "April/Leo: The Episode" as not only do they work together well, but April tries several times to cheer Leo up over their situation, AND this is an episode or so after the HoYay-tastic "Race With the Demon". Oh, and the above mentioned "eating" moment in the narm section only added fuel to the fire for some people.
* RescuedFromTheScrappyHeap:
** Leonardo tended to get a lot of reactions ranging from apathy to dislike from fans in previous incarnations due to being what they felt to be a rather boring character. This incarnation gets a fair amount of like due to the show making an effort to showcase him as still learning to be a leader, as he has just started, and the addition of other characteristics (his love of ''Space Heroes'' and disobeying Splinter a bit more frequently).
*** In fact, one of this shows biggest selling points amongst the fandom is "when was the last time you could say ''Leonardo'' was your favorite turtle?"
** One can now argue Raph has been rescued from the heap after "Operation: Breakout" as he took several [[TookALevelInKindness levels of kindness]] within the episode. A notable example is [[CoolBigBro his behavior towards Mikey]] in the episode. In the beginning he intentionally does something he knows Mikey can't get enough (albeit at the expense of Donnie), his once an episode DopeSlap came off as a warning for Mikey to mind his manners (Mikey basically just called Leo stupid, which visibly made Leo angry) and near the end he laughs at one of Mikey's jokes while [[AffectionateGestureToTheHead patting his head]]. It helps that he has similar [[CoolBigBro behavior]] towards Donnie in the episode. When he finds out that, yes Donnie still has a crush on April he recommends Donnie not involve him, both as something he obviously thought was helpful advice (since he just embarrassed Donnie) and because he was clearly a little angry Donnie was, in a sense, using him. This has unintended consequences as Donnie [[spoiler: leaves without the others on a resque mission for April's dad.]] He obviously felt bad when he realized this and in the end retold the episodes events in a way that made Donnie look like the big hero of the day which [[spoiler: resulted in Donnie getting a hug from April]]. [[RuleOfThree It probably helped even more]] that he was called out by Leo for his negative behavior and then, as stated above, made up for it by the end of the episode.
*** This only furthered when the season 1 finale showed that as long as it isn't [[WhyDidItHaveToBeSnakes a cockroach]] he is [[FriendToAllLivingThings kind, gentle, and even affectionate to non-mutated animals.]]
** Michelangelo is frequently derided for being even dumber than his previous incarnations, but has earned some likability for having occasional moments of competence in episodes like "New Friend, Old Enemy" and "Parasitica".
** Donatello when he [[spoiler: finally realized that he should stop pursuing April]] in season 3. Sure, [[spoiler: it's implied that he still has feelings for her]], but that was mostly April's fault this time.
* RomanticPlotTumor: Almost every episode featuring April in a big role is going to heavily feature Donatello's obsessive crush on her, and it's gotten to the point where many are tired of it, especially now that Casey Jones is in the picture and making it a love triangle. Season 3 seems to be making a conscious effort to alleviate this, downplaying Donatello's crush on the character and giving her an episode with her and Leonardo as the focus characters.
* TheScrappy: All of the turtles, save for Leo [[{{Irony}} (Usually the least followed one nonetheless!)]], got into this zone at some point:
** Michelangelo gets this from one side of the BrokenBase, due to feeling the show downplayed his HiddenDepths in favor of making a bigger deal on his humorous side, which results in him being grating due to him [[ComicallyMissingThePoint missing the point]] of usually very high stakes consequences.
*** The hate seems to be magnified a bit with him constantly whining about the Rat King's ''name'' in the latter's debut episode. Aside from the fact that it seems like a TakeThat to a classic character with an established history and fanbase, Michelangelo seems to think he has dibs on how villains should name themselves and would ''not shut up about it for the whole episode.''
** Raphael, due to being a bigger jerk in this series than he's usually depicted, has his fair share of people who dislike him. This has cooled off a bit though, thanks to getting HiddenDepths and toning down his behavior in later episodes.
** Donnie has landed himself in this by the end of season one. His crush on April was viewed by fans as cute and even endearing during early season one, then suddenly it stopped being referenced to for a few episodes, then it came back but extremely flanderized. More focus starts getting put on it and we get to see [[TheSmartGuy Donnie]] makes less than [[IdiotBall rational]] choices because of it. Then there was Operation: Breakout. Raph tells Donnie to leave him out of his attempts at impress April. (Raph clearly didn't like being used like that and was offering some [[SincerityMode advise he seemed to think was helpful.]]) So what does Donnie do? He basically goes [[spoiler: on a VERY dangerous rescue mission, [[WhatAnIdiot by himself]], without [[TooDumbToLive telling anybody]], to get April's dad away from the Kranng. Not only that but he almost gets himself and Mr.O'Neal killed multiple times.]] All to impress April.
** Outside of the turtles are the Kraang, as they get this mostly for the fact that once they start talking, they're almost never going to shut up. As time has gone on, the show seems to have tried to phase out the humor aspects, possibly [[RescuedFromTheScrappyHeap saving them]] a little.
** The Pulverizer is quite disliked for being an obnoxious fanboy whose levels of stupidity range from uncanny to mind blowing.
** Spiderbytez, an intentional case, for being a crude, realistically obnoxious person before his mutation, and only got worse upon it. Does(n't) help that grumpy neighbors like him exist and are one IRL.
* SeasonalRot: Many fans of the first season have expressed dislike or disappointment in season two. The cause of this occurred behind the scenes, as the writers from the first season were all replaced with brand new-writers unfamiliar with the show for season two. As a result, it took the new writers a good while to really find their groove, and the results are noticeable. PacingProblems began showing up with some plot elements being resolved too quickly while others wound up taking forever, the turtles, [[TookALevelInDumbass particularly Mikey]] [[RomanticPlotTumor and Donny]], all went through some {{Flanderization}}, several new characters were introduced but many of them were underutilized, and many [[TheyChangedItNowItSucks controversial changes]] began happening which [[BrokenBase left people divided all over the place]]. That said, the final few episodes do show noticeable improvement and the season finale was particularly well-received, with the exception of the [[spoiler: [[BaseBreaker Irma twist]].]]
** Some fans started to get tired of the first half of Season Three's ArcFatigue, with the Turtles being stuck at April's farm, and the RomanticPlotTumor between Donatello, April, and Casey coming back after it was seemingly resolved at the end of season two has made some people angry. Not to mention the show completely ignoring the Kraang invasion plot. [[spoiler: And when it finally did conclude the Kraang invasion arc after this, many felt it came off as a huge AntiClimax by rushing the whole thing through five episodes, with the invasion aspect itself only being dealt with for two of them.]]
* SpecialEffectFailure: While the show's CGI is generally fairly good, sometimes an acute eye will spot that there's something off about the skyline or the distant buildings.
** The Invasion two-parter had it snowing, along with generally well-detailed buildings and environments to reflect this, with snow covering the buildings in Part 1 and for most of Part 2, but by night-time, the snow disappears from the environment completely, even when it was previously on the buildings and sidewalks. [[note]]Not that snow is incapable of ''stopping'', mind you.[[/note]]
%%** In ''Newtralized'', at least one scene shows Slash wearing Donnie and Mikey's masks wrapped around his arm.
* SpoiledByTheFormat: If you're paying attention to the running time in "Dream Beavers", [[spoiler: the fact that the beavers are released with only two minutes to go will probably let you guess that they aren't as dangerous in the real world as they are in dreams.]]
* {{Shipping}}: Donnie and April have been getting this since the first episode. Also, people started shipping Leo with Karai as soon as the description for "New Girl in Town" was released (a legacy of the 2003 show).
** Casey didn't appear until Season 2, but he got DieForOurShip from Donnie X April shippers long before his debut.
*** Some fans got so tired of the drama surrounding April, Donnie, and Casey that they disregarded the love triangle completely and began "[[HeterosexualLifePartners bro-shipping]]" Casey and Raph instead.
* ShipsThatPassInTheNight: Casey Jones was being shipped with Karai not just before they ever met, before he even appeared.
* SomeAnvilsNeedToBeDropped: It seems the show has a minor theme about not allowing friendships to be ruined. Splinter and Shredder were once the best of friends until they competed for Tang Shen's affections. Saki went as far as to provoke Splinter, and instead of trying to mend their friendship, the two allowed their rivalry to become hatred, resulting in Splinter losing everything he loved. Then there's the incident with April [[spoiler:turning her back on the turtles after they accidentally mutate her father into a giant bat. Casey tells her about how he unintentionally allowed his best friend Nick to hate him after accidentally hurting him, which convinces her not to allow an accident to turn her back on her friends.]] Had Splinter and Shredder did what April had done and try remain friends after everything, Splinter could have lived a happier life while Shredder could have moved on.
* SpoiledByTheFormat: Tiger Claw being added to the opening titles made his supposed death by Kraathatrogon very suspicious, to say the least.
* {{Squick}}:
** A birthday cake made out of algae and earthworms.
** Almost everything about the Spy-Roach from [[Recap/TeenageMutantNinjaTurtles2012S1E18CockroachTerminator Cockroach Terminator]].
** In-Universe, [[spoiler:the Turtles reaction to the sea monster guarding the Kraang fortress ''falling in love with their submarine''.]]
** Depending on whether or not you believe the [[spoiler:mutagen made the turtles related to Splinter by blood]] the fact that [[spoiler: Karai is infact Splinter's daughter]] may have very well caused this reaction in some fans. [[spoiler:Especially since Leo had/has a crush on her and Raph admitted she's hot "in the evil way".]]
*** The people who were guessing that [[spoiler:this version of Karai and Splinter are related since]] before the show even aired (due to promotional material) found the [[spoiler:Leo+Karai ship]] gross, especially if they're in the party that [[spoiler:believe the Turtles and Splinter are related thanks to the mutagen]]. The confirmation that [[spoiler:yes, Karai is Splinter's daughter]] has caused several people to [[spoiler:abandon the Leo+Karai ship.]]
** Some fans find any mutant+human shipping to be a bit...odd.
** [[http://24.media.tumblr.com/36406393c13d454ef554e5a362ff5b40/tumblr_ms9f2yM0ew1rd9dsao5_1280.jpg Concept art notes]] on the Mousers reveal that their "gut" carries 5 Rat Carcasses. ''Ew.''
** Wormquake/The Manhattan Project reveals that mutagen comes from [[spoiler: alien worms and the mutagen has to be milked from them.]]
** At the end of "Target: April O' Neil" Mikey takes out a slice of pizza with bugs on it and eats it.
** A FreezeFrameBonus in "Metalhead Rewired" reveals potato chips with flavors such as "Scab N' Sausage", "Menthol", "Salt N' Sweat" and "Mucous & Chives".
** The pizza that Mikey bakes in "Pizza Face". [[http://i.imgur.com/27oedz5.jpg Just look at it.]] Undestandably everyone was grossed out when Mikey actually ates it.
* StopHelpingMe: The turtle's basic reaction to anything "The Pulverizer"/Timothy does to try and be more like them or be useful to them.
* TheyChangedItNowItSucks:
** Believe it or not, the most controversial change is the addition of a third toe on the Turtles. Fans ''exploded.''
** April being de-aged to a teenager hasn't been taken very well. And as of "Monkey Brains," people are complaining about [[spoiler: her "empathic" ability and Splinter's decision to train her in ninjutsu because of it]].
** Neither has the replacement of "Cowabunga!" with "Booyakasha!"
** Karai's [[http://images3.wikia.nocookie.net/__cb20130119004208/tmnt/images/6/69/Turtles_Karai_press_photo.jpg new design.]]
*** Reactions are a bit better now that [[http://images1.wikia.nocookie.net/tmnt/images/d/dd/Karai_pins_Leo.jpg her full appearance has been revealed]].
*** Though the decision to make her [[spoiler: Hamato Yoshi's biological daughter is something that threw fans off. Especially since they saw that plot-twist coming a mile away]].
*** Even more controversial for a lot of fans has been [[spoiler: Karai becoming a mutant.]] As noted in the Base Breaker section, due to being a heavily drastic change to the series it's made some people give up on the show.
** Within this particular version, the second season's DarkerAndEdgier turn, [[spoiler:in which April's father becomes a mutant, and as a result now hates the Turtles for causing it to happen, despite the fact that it was an accident.]]
** The revelation that [[spoiler: April is a [[HalfHumanHybrid half-Kraang mutant]] is already starting to turn some people off.]]
** Dominic Catrambone replacing Jason Biggs as Leonardo has sparked a lot of complaints.
*** Creator/SethGreen being confirmed to take over beginning in season 3 has provoked a similar reaction, especially since Catrambone was at least able to mimic Biggs' voice almost perfectly. Green just sounds too different for it to work.
* TheyWastedAPerfectlyGoodCharacter: Slash, as a villain. In his first appearance, Slash is without a doubt, a villain. By his second appearance, he had a very brief team up with the turtles and other mutants against the Kraang and in his third episode, Slash is still an enemy of the turtles, but shows [[EvenEvilHasStandards there are some lines he will not cross like blowing a building when there could be people in the vicinity of the explosion]]. At the end, he fights against both the Kraang and the Newtralizer and his grudge against the turtles disappears when Raph saves him from being crushed by the Kraang walker. What's really jarring is the fact that Slash appears alongside the other villains in the third version of the theme song.
** April also qualifies. She's being trained as a kunoichi, is now confirmed to be [[spoiler:half-Kraang and half-human]], is [[spoiler:immune to Mutagen]] and has empathy/telepathy powers. Although this makes her cliche to some, the writers could have actually done something with it. Instead, everything is completely tossed over. Despite her training, she's kidnapped or in danger in almost every episode. The [[spoiler:half-Kraang, half-human idea]] is hardly ever mentioned again. Her immunity is understandable, but her powers make her the source of last-minute solutions to problem. As of the love triangle between her, Casey, and Donny, she's little more than a plot device only there to be kidnapped and ignore Donny's affections.
** Irma makes her first appearance since the 80's cartoons, to the delight of fans. There is teasing over when she will finally meet the turtles and how her interactions with them and Splinter will be like, and one episode establishes that she may have an unknown, hidden power, which would have made this Irma more fleshed out than the boy-crazy best friend from the original cartoon. [[spoiler:Instead, Irma was never real to begin with and was actually a Kraang all along, used solely to find the turtles' lair and quickly disposed of by Splinter]], which rather feels like the writers just gave the middle finger to long-time fans who wanted Irma to be among the supporting cast.
*** It gets even worse in season 3, where [[spoiler:Kraang Sub-Prime returns, still wearing the Irma mech suit for no apparent reason, not to mention the Kraang having created an army of robot Irmas to fight the turtles and their allies. Meaning that we see the good guys wailing on and destroying lots of Irma bots, and the last shot we see of one is Kraang Sub-Prime's decapitated Irma mech suit's head floating around with a goofy look on its face, basically making it a "Let's Destroy Irma" festival.]] By now it doesn't feel like a middle finger so much as the creators of this show seeming to have a hatred for the character of Irma and rubbing it in the faces of the long-time fans that this is all they get.
** Xever has interesting chemistry with Raphael, a unique fighting style among all the ninjitsu-using characters in the series, and is a surprisingly threatening and dangerous planner, which makes Season 2's treatment ([[OutOfFocus appearing less often]] and [[VillainDecay being played more for humor]]) of the character disappointing.
** Mikey, in the eyes of some, due to the show implying that some of his less than intelligent actions being due to feeling inadequate compared to his brothers. He NEVER gets character development from this, nor is it explored at all.
* TheyWastedAPerfectlyGoodPlot: April [[YouCantGoHomeAgain being unable to leave the lair]] when both Shredder and the Kraang are after her is never even implied after it comes up, and only lasts for a few episodes.
** Although in Fungus Humongus, she did mention she spent weeks living with them.
** As mentioned above, the implication that Mikey feels inadequate when compared to Raph, Leo, and Donnie. This could have been a really good plot with great character development but so far the writer's haven't even touched upon it unless they're trying to make the audience feel bad for Mikey.
* UglyCute:
** The Mousers. They even make cat-like noises!
** Justin.
** Pete.
** This incarnation of Casey, as opposed to being quite attractive in the [[WesternAnimation/TeenageMutantNinjaTurtles2003 previous cartoon]].
** Slash just may count, having those small, creepy eyes and big jaws and spikes protruding out of his body, but yet you still want to pinch his cheeks, if he has any.
** The mutant mushroom's minions. At least from Mikey's point of view.
** The Kraathatrogons, who have ''very'' catlike faces that, when they're annoyed, turn into maws, which somehow doesn't mitigate how strangely ''adorable'' these giant worms are.
* UncannyValley:
** While stylized like everything else in the show, the Kraang's disguises are droll businessmen whose eyes and mouths scarcely move, as if the Kraang are barely trying with their disguises, creating a rather odd and creepy effect.
** Then there's [[spoiler:Mrs. Campbell]], who is also a Kraang creation, and only gets creepier during [[spoiler:her]] fight with the turtles.
** There's something creepy about the realistic lips that [[spoiler:the mutated Pulverizer aka Mutagen Man]] has.
** In Season 1, some of April's facial expressions caused for a wider mouth, such as smiling or screaming. Her lips looked kind of...''off.''
* UnintentionallyUnsympathetic: Michelangelo often hits this due to at least a few occasions of being InnocentlyInsensitive, [[NeverMyFault refusing to see any of his actions as in any way his fault]] for the most part, and his comic relief role being played up during fights for their lives.
** Donnie, due to his sole motivation for doing many things (in which he should ALREADY be doing out of either the goodness of his heart or because he's legitimately responsible for it) so that April will like him.
** Raphael earlier in the show's run. This [[IntendedAudienceReaction may or may not have been intended]] given that the fans warmed up to him after his character development.
** April has been heavily hit with this. In spite of all the crap she goes through, due to her self-righteous attitude and tendency to blame others for things that either aren't their fault or had little control in have made a lot of people quit feeling sorry for her. Not helping has been [[spoiler: her kissing Don and getting him confused about his feelings for her again after he'd managed to put them aside]], which has come off as her unintentionally toying with him to some.
* TheUntwist: Many fans saw the first season finale's twist about Splinter's daughter coming a mile away. The fact that Hamato Yoshi never had a daughter in other continuities [[spoiler: and that in continuities where she was Shredder's daughter, Karai was always explicitly referred to as his ''adopted'' daughter]] is what made it easy to predict.
** Absolutely nobody was surprised that [[spoiler: Steranko and Zeck become Bebop and Rocksteady]].
* VillainSue: Tiger Claw. Beyond being absolutely pumped up by the Shredder as a Badass and automatically being promoted as his NumberTwo on his first day over all of his other minions, including [[TheDragon Rahzar]] and [[EnsembleDarkhorse Karai]], he often manages to defeat all the turtles (and anyone else fighting with them at the same time) single-handedly. Plus he's one of the few villians on the show with [[MonsterSobStory little to no backstory]], so to speak. However, it seems the writers are making him more fallible as he's taken more losses (especially in the finale), so time will tell when he's out of here.
* WhatAnIdiot: Episode 6. A Kraang takes control of Donnie's robot and the guys futilely attack it, claiming it has to have some sort of weak spot...completely ignoring the Kraang that's just sitting on its head right out there in the open.
** The season 2 premiere has the turtles (except for Donnie) playing dodgeball with the Kraang communication orb. Which Donnie calls them out on. Nothing new for Mikey and Raph, but Leo should've known better. Sure nothing bad came of it but still.
** A better example would be[[spoiler: Mikey telling April that it was their fault that her father became mutated, causing her to hate them]]
** Mikey holds the ball even harder in the "Shellacne" episode, since in order to make himself cooler he exposed himself to dangerous experimental retro-mutagen, missing the fact that Donatello put several warnings of how deadly it was on the can since he only looked at the front.
** A non-lethal example but still worth a facepalm. In ''Pizza Face'', Mikey tries to take pictures of all the people that are being mind controlled by Antonio. When he's done and checks the camera, all of the pictures consist of his eye, and he thinks the camera's broken, not realizing he was pointing the camera in the wrong direction.
** Anton Zeck is out running in the middle of the street while invisible where no drivers can see him. No wonder the Shellraiser hit him.
* WhatDoYouMeanItWasntMadeOnDrugs: The Pizza Face episode.
* WTHCastingAgency: Roseanne Barr being cast as [[spoiler:Kraang Prime]].
** It may well have been intentional casting a comedian considering how ridiculous the Kraang are.
** Oddly enough, she and Creator/GilbertGottfried play their roles completely straight.
* TheWoobie: Poor, poor Kirby. The guy just can't catch a break.
** April. In season 1, the worst thing that happens to her is her dad getting kidnapped. Things get even worse in season 2.