* AlternativeCharacterInterpretation:
** Is it possible than Sam may be in love with Danny ''Phantom'' more than Danny Fenton? Is this the ''real'' reason why she acted so pissed during the GrandFinale when he [[spoiler:briefly and willingly took away his own powers]]? This makes a lot of sense with the episode "Double Cross My Heart," where Sam's new crush just so happens to have white hair (which is even in a similar style to Danny's), wears only black and white, and has green eyes.
** Vlad: sympathetic villain who deserves the love he's sought, or a jerk who lost that chance years ago and needs to get his karmic justification?
*** Or TheSociopath who "loves" Maddie as one adores a painting, and would treat her such? The "bad" timeline where he gets her would suggest this...
** Considering how easily Tucker is corrupted by his vice and how little time he's given in Season 3, it's possible that he's secretly devising an evil plot to wipe out his friends and take over the world. He becomes a [[spoiler: mayor]] by the end of the series, giving him a significant portion of power in his hometown.
** A somewhat common interpretation for Danny is that has developed into a StepfordSmiler, explaining why he's remained pretty damn chipper through the whole show, especially after the events of "The Ultimate Enemy," which by all means could have (and should have) traumatized him.
** [[http://daughter-in-the-basement.tumblr.com/post/39118327867/the-fridge-horror-of-dannielle-phantom This tumblr page]] suggests that Danielle may be a StepfordSmiler over her severing ties with Vlad and having Danny as her only family, not to mention her life alone on the streets. It also suggests the reason she doesn't stay with Danny isn't "because she had places to go" but out of guilt over the trouble she caused him.
* {{Anvilicious}}: Many episodes have aesops. Many of these hit you over the head with them. Livin' Large is probably among the worst offenders.
* ArcFatigue: The whole Danny and Sam romance that took place through the whole show and only became official in the series finale. It's understandably jarring that it was 50 episodes to sit through that constantly brought it nowhere and by the end of the series when it officially completed, they might as well have been done with it midway through the series.
* AwesomeArt: One of the many praises about the show is that it's more detailed in both visuals and character designs, compared to ''WesternAnimation/FairlyOddparents'' (Hartman's previous show).
* BadassDecay:
** Skulker at first was the most dangerous enemy Danny encountered, but in his following appearances, he became less and less a serious threat, only showing competence one or two times during his encounters with Danny.
** Vlad also suffered from this. In the beginning, he was shown to be the most powerful enemy Danny had, being able to easily defeat Danny with one hand behind his back. However, such success diminished overtime when he encountered the likes of Pariah Dark and Vortex. Even a few times, Danny was able to beat him.
** Danny himself seemed to suffer this in Season 3. Following two seasons that developed his growth as a character, the third season regressed him to doing rather idiotic things, became extremely selfish and depending far too heavily on Sam.
* BaseBreaker:
** [[SoapBoxSadie Sam Manson.]] She is a polarizing figure due to being bossy and hypocritical in the eyes of many fans, usually as a means to push her agenda. Some examples include temporarily forcing her Ultra-Recyclo Vegetarian diet on the entirety of Casper High without the consent (or even knowledge) of her peers, even in the face of a ghost attack, protesting a completely voluntary beauty contest, and using Danny's powers for her own gain despite telling him he should be selfless with them. Her fans, on the other hand, view her as a lonely teenager struggling with an unhappy home life who strives to be the voice of reason even when it gets her flack from her friends, in addition to romanticizing her (eventually canonical) relationship with Danny.
** Jack Fenton. Some see him as a BumblingDad who is genuinely funny and with some awesome moments. Others see him as an incredibly irresponsible, racist, violent would-be MadScientist with a skewd sense of morality, whose [[DesignatedHero carelessness had caused the entire plot.]]
** In some extent, Danielle "Dani" Phantom. Part of the fans think she has no interesting personality, other thinks she is an interesting character with unexplored potential.
** Tucker Foley to an extent as well, some find his character to be funny and endearing, while others find him obnoxious.
* BigLippedAlligatorMoment: The random iguana-ghost attack during the beginning of "King Tuck". It's never mentioned again for the rest of the episode.
* CanonFodder: Lots, the most famous being [[spoiler:Dark Danny's ultimate fate]].
* ClicheStorm: The show is a cliché storm for the superhero genre, but usually makes it all work somehow, probably because the show had a heavy emphasis on comedy; the writing made it clear that they knew it was all cliched, so at times it could come off as an AffectionateParody of the superhero genre.
* CompleteMonster: See WesternAnimation/TheUltimateEnemy for details on the sole character in the series to earn this.
* CrackPairing:
** Maddie and Spectra, or [[PortmanteauCoupleName "Mectra"]] as it's called, is starting to grow in popularity.
** Danny x Ember (Phantom Rocker) is also rather popular.
* DesignatedHero: Sam Manson is seen as this in the eyes of many fans. Episodes that take her side, such as ''"Beauty Marked", "Double Cross My Heart" and "Phantom Planet"'' being prime examples.
* DracoInLeatherPants:
** Vlad is the second most paired off character in the series. The fact that he has plotted and ''would'' commit murder, was responsible for many people getting hurt in attacks and [[spoiler:Dark Danny]] in one timeline doesn't matter much to most of his fangirls. They see (as the entry puts it) a "...suave, handsome, charismatic, obscenely rich, relatively competent, with an alternate form heavily resembling a vampire and superficially sympathetic motives (he wants to make his old love interest his wife and his arch-nemesis his son): a perfect object for fangirl lust..."
** [[spoiler:Dark Danny]] also has his fans. Most notable thing about him is his voice and body, but most fans tend to forget he's a mass murdering psychopath that would as just as soon [[http://coronadofwb.deviantart.com/art/In-a-Moment-of-Desperation-73714523 do this to them]] as kiss them... if they're ''lucky''. Remember he ''is'' a '''sadist'''.
** Both Ember and Desiree are subject to this treatment as well, due to the fact that they're both said to have had very tragic pasts, which make fans believe that they're not truly evil deep down, just confused and desperately wanting love. There's also the fact that both of them tend to be popular with fanboys for reasons you can well imagine.
** According to fans, the Ghost Writer is one HotLibrarian. Somewhat averted in that he wasn't evil, just overzealous in trying to teach Danny a lesson.
* EarWorm:
** You will remember my naaaame.
** Also the intro song.
*** [[http://www.youtube.com/watch?v=ZiokCOOL1CU The original theme song deserves a mention as well.]]
* EnsembleDarkhorse:
** Clockwork. For a character only appearing in two episodes, he has amassed quite a following.
** Same for Ghost Writer, especially with the fangirls. One episode and there are '''SWARMS''' of fanart of him ''everywhere''. Don't even get me started on [[spoiler:[[EvilIsSexy Dark Danny]]]].
** And for the fanboys, there is Desiree, a LiteralGenie with a sympathetic backstory, and one of the best bodies in 2-D animation, and [=Ember McLain=] who is a ghostly rocker girl voiced by {{Tara Strong}}, sings a [[EarWorm very catchy]] song and has a [[DrivenToSuicide rather]] [[EpilepticTrees dark]] [[WoobieDestroyerOfWorlds and very sympathetic backstory]].
** Not to mention Spectra, Skulker, and [[LargeHam THE BOX GHOST!]]
** Freakshow, the only human character who could truly be considered an antagonist. He only appeared as the BigBad of one episode, and the third TV movie, but is one of the more popular villains, with the general consensus being that TheyWastedAPerfectlyGoodCharacter.
* EsotericHappyEnding: Butch Hartman wrote "Phantom Planet" as a means of trying to wrap the series up. However, instead of bringing finality, many see a lot of problems with its ending. [[spoiler: Danny's secret has been revealed to the world, but just because he saved the world doesn't mean humans who hate or hunt Danny Phantom, like the Guys in White, will leave him alone. In fact, "Reality Trip" show how Danny would deal with everyone in the world knowing his secret. Tucker Foley is now mayor, now Amity Park is governed by an underage, perverted, technology obsessed teenager with zero skills in leadership. Also, too many subplots are left hanging, from Danielle still remaining a homeless girl to Valerie still living in her poor conditioned apartment]].
* EvilIsCool:
** Vlad Masters, adorned in a black suit.
** Also [[spoiler:Dark Danny]], whose voice acting was so brilliant it stands out in fandom. It even gained him fangirls. Also, that muscular body is a very large improvement for someone who did it in just ten years.
** Ghost Writer. (Although he wasn't so much a villain as he was excessive in teaching Danny a lesson about being a jerk on Christmas.)
* EvilIsSexy:
** Penelope Spectra fits and aims to be this. Tucker even seems to have this response upon seeing her new body. [[RapidAging As long as she stays away from the Fenton Peeler]].
** Desiree: A beauty and buxom JackassGenie with HartmanHips.
** Ember: Her regular and pirate outfits.
** Sam fit this during her temporarily being evil in "Urban Jungle", with her Poison Ivy and Maleficent inspired outfits.
%%** Johnny 13 and Kitty (though they're more on the anti-hero/anti-villain side of things).
* FamilyUnfriendlyAesop: The lessons Danny learns in "Phantom Planet": What you want is irrelevant compared to what the girl you like wants. If you aren't unique and different from everyone else, then you aren't interesting or worth much. Also, giving up something to protect your family and friends makes you selfish.
* {{Fanon}}:
** Everyone seems to believe that Paulina's last name is "Sanchez", but this is never mentioned anywhere in the show's canon. Also, many believe that "James" is Danny's middle name. Also, a number are divided on if Vlad can sense ghosts or not.
** Many fans are under assumption that Ember's song indicates a bad romance that tragically took her life. [[note]] The full lyrics to the Ember song can be found [[http://www.justsomelyrics.com/1414755/Ember-Mclane-Remember-Lyrics here]].[[/note]] The full song was recorded as well and can be heard on [[http://www.butchhartman.com/html/audio.htm Butch Hartman's official website]].
** Ember has numerous bits of fanon surrounding her, given that she's generally considered one of the more complex secondary characters. Her human name having been "Amber" is another common one. Fics that pair her and Danny will also usually have Kitty and Johnny 13 as the BetaCouple and local [[ShipperOnDeck shippers on deck]]. She usually had red hair prior to her death, but brown and [[DyeHard dyed blue]] are common as well. She typically died at least ten years before the series (anywhere from TheSeventies to TheNineties) and despite WordOfGod insisting otherwise [[DrivenToSuicide suicide]] is the most common reason for her death in fanworks.
** Though a picture exists, Vlad being a smoker has spread around- probably because it suits his character.
** On a similar vein, slash-friendly fans have Vlad and Jack MistakenForGay in college or hint that the [[NoodleIncident Backwash Incident]] involved slash.
** Some Danny/Sam shippers believe Danny's affectionate nickname for Sam is "Sammykins". The only time it was ever used in the show's canon was by her mother when waking Sam up.
** Most if not all fics involving Vlad mention that Danny hates being called "Daniel", despite him never really having a problem with in in the series.
** FanonDiscontinuity: Many fans prefer to think that most, if not all of, season 3 never happened. Even those who liked it prefer to think ''Phantom Planet'' never happened.
** Some have come to believe that Danielle might have been adopted by the Fentons after the events of Phantom Planet, [[WhatCouldHaveBeen which is how her arc was originally meant to end]].
* FanPreferredCouple: As you can imagine, Sam is a very polarizing character to the point where people prefer pairing Danny with someone else, such as Valerie, Ember or even the lesser important Star.
* FriendlyFandoms: The show is popular with fans of ''WesternAnimation/RandyCunninghamNinthGradeNinja'' and ''WesternAnimation/AmericanDragonJakeLong'', due to their similar concepts (teenage boy heroes with friends who know about their secret identities and fend off a multitude of different enemies).
* GrowingTheBeard: Though Season One had its continuity and StoryArc (the first nine episodes are known by the fandom as ''The Magnificent Nine''), Season Two upped the ante with deeper, darker plots and more CharacterDevelopment.
* HilariousInHindsight:
** Paulina being a Latina version of [[SpiderMan Liz Allan]] when, in ''WesternAnimation/TheSpectacularSpiderMan'', Liz was given a RaceLift and is Latina in the show... and interestingly she looks ''very'' similar to Paulina, as well.
** Kwan also seems to be based off Kenny [=McFarlane=], and Kenny was made Asian in Spectacular.
** The episode titled "Shades of Gray" can't get into some people's minds without thinking about ''Literature/FiftyShadesOfGrey''.
** During a battle with Vlad in the first episode of Season 3, Danny is shocked at how "rusty" he's apparently gotten and how easy it is to beat him, remarking throughout the fight how "you've really lost your edge." In context, it turns out Vlad's so weak because he's currently split himself into hundreds of duplicates that he's using to possess everyone in town, but considering the VillainDecay he suffered from this point onward, it sounds like Danny's LeaningOnTheFourthWall.
** So Danny's having trouble controlling his new ice powers due to lack of use and needs to learn to "let it out"... Just ''try'' to re-watch the Season 3 episode "Urban Jungle" without hearing [[Disney/{{Frozen}} "Let It Go"]] in your head.
** The original idea for Danny was that he was an {{Expy}} of ComicBook/GhostRider. Now, in 2015, a Franchise/KamenRider with a Ghost Theme was announced using the exact same idea.
** Ember [=McClain=] is an evil musician from another dimension with a teal color scheme, has a pony tail, and uses her music to hypnotize people. Doesn't that remind you of [[WesternAnimation/MyLittlePonyEquestriaGirlsRainbowRocks another similar villainess?]]
** Look at the shapeshifting ghost Amorpho from "Forever Phantom". [[Franchise/TheSlenderManMythos Doesn't his design remind you of a certain someone?]]
** In 2012, it took fangirls no time to notice that Danny looks just like a 2D-animated version of another [[WesternAnimation/RiseOfTheGuardians ghost boy with ice powers]], who has a very [[NotSoDifferent similar]] [[WeCanRuleTogether relationship]] with his story's BigBad.
* HoYay: Parodied when Danny and Tucker wind up in a SleepCute position (which is current the page image for HoYay in WesternAnimation).
* InformedWrongness: Any argument against Sam's viewpoint. This varies from keeping the last of an endangered species in a zoo as opposed to the wild ''(One of a Kind)'', entering a beauty pageant to show how it is a "throw back to the dark ages" for women despite being voluntary ''(Beauty Marked)'' and [[spoiler:Danny giving up his powers voluntarily to keep his loved ones out of danger]] ''(Phantom Planet)''.
* JerkassWoobie: [[AntiVillain Valerie]] and [[BigBad Vlad]]. Also Ember and Desiree, to an extent.
* MagnificentBastard: Vlad Masters/Plasmius and Walker both qualify.
* MemeticMutation: Phantomrose96's infamous [[http://phantomrose96.tumblr.com/post/119411768942/kinqdanny-kinqdanny-okay-but-dash-having-a "It's not gay if he's dead,"]] which [[http://phantomrose96.tumblr.com/tagged/ingihd/chrono cannot be escaped from.]]
* {{Moe}}: Danielle.
* MoralEventHorizon:
** The show played it oddly straight with Danny's alternate future. The whole "[[spoiler:Dark Danny]] creation" scene was horrific and it horrified even Vlad, which really says something. Also see [[spoiler:Dark Danny]]'s first appearance where he apparently kills multiple people ''on screen''. AxCrazy, indeed.
** Vlad got his own crossing of the MoralEventHorizon when he treated [[OppositeSexClone Danielle]] as [[WhatMeasureIsANonHuman less than human.]] Then in the penultimate episode [[spoiler:he tries to melt her alive]].
** Spectra crosses this in "Doctor's Disorders', when she infects Casper High with a ghost virus, knowing that it would be fatal.
** Freakshow crosses it when he reveals he lied about sparing Danny's family and placed them on a roller coaster designed with traps set to kill them, despite that he had a brief moment where he almost formed an OddFriendship with Jazz.
* OlderThanTheyThink: The show's tagline "Not seeing is believing" was also the tagline of the book ''My Best Friend Is Invisible'' from TheNineties classic ''Literature/{{Goosebumps}}'' series.
* PeripheryDemographic: "Boy's Action Show"--yeah right, Hartman. The fangirls of mostly the teenage and college age variety eat this show up.
* PopularityPolynomial: The fandom gained a resurgence in the early-to-mid 2010s for whatever reason.
* RescuedFromTheScrappyHeap:
** Some changed their opinion of [[TheScrappy Danielle]] after D-Stabilized, as it depicted her life as a homeless clone in a sympathetic light, her presence brought out better characterization from Danny than most of what season 3 brought out and she was able to take on Vlad on her own after her body becomes stabilized.
** To a greater extent, Jazz. She started out a basic older sister: self-centered, judgmental and barely got along with her brother. When she learned Danny was half-ghost and he eventually discovered she had already known his secret, her character developed. She showed greater affection for her brother, accepted her parents' obsession with ghosts (to a degree) and showed genuine skill in ghost hunting.
* RomanticPlotTumor: One of the arguments of season 3 is that too many episodes take a great deal of time around Danny and Sam's relationship when the episodes themselves weren't even about them. ''Frightmare'' and ''Claw of the Wild'', which had main plots that had nothing to do with with Sam, were victims of this.
* RootingForTheEmpire: The show has a huge number of fans for the villains who are more liked than the main hero. Or at least, more liked than Sam.
* SeasonalRot: Despite the introductions of new friends and foes, the development of new powers, and the return of some fan favorite characters, many felt the third season went through a bit of this due to changing of executives, rushed or forgotten subplots introduced earlier and the somewhat weak writing plots of many episodes ("Urban Jungle" is one of the most prominent examples).
* SelfFanservice: Due perhaps to heavy abuse of ThickLineAnimation, the series has enourmous amounts of this, mostly directed towards the female characters as Maddie, the mother of the main protagonist.
* ShippingTropes: Aplenty.
** FoeYayShipping: Plenty of Vlad/Danny for all!
** LauncherOfAThousandShips: Seriously, the fans pair Danny up with everyone...and everything. Many of these pairings have nicknames, such as Pitch Pearl.
*** Strangest might possibly be [[CargoShip Danny x Thermos]]. (Granted the pairing was created as a gag due to the [[SeriousBusiness craziness of the fandom at the time]]. That didn't stop someone from initiating Rule 34 for this pairing, though...)
** MindGameShip: Ala ''WesternAnimation/TeenTitans''. Some {{Shipp|ing}}ers just took it and ran with it.
** ShipToShipCombat: The infamous "True-Fan VS Anti-Fan" wars which basically boiled down to "Canon" (Danny/Sam) VS "Fanon" (Danny/Anyone Else) and/or "Heterosexual Pairings" (IE: Danny/Sam, Danny/Valerie) VS "Slash" (Danny/Vlad, Danny/Dash, and even Danny/Himself *Don't ask*).
** ShipsThatPassInTheNight: The Dani/Youngblood ship, despite the two never having interactions, or even appearing in the same episode.
** StrangledByTheRedString: For some fans Danny Fenton[=/=]Phantom and Sam Manson. Many will argue that Sam, who, despite her talk of individualism, demands conformity to her views, and thus, makes a poor partner to the hero.
* SomeAnvilsNeedToBeDropped:
** Living in the past and being obsessed with what could've been is unhealthy. Despite his vast fortunes and superpowers, Vlad had spent the last 20 years obsessed with getting the girl he had a one-sided affection for and cause suffering to a friend who accidentally scarred his face, regardless of the latter wanting forgiveness and the two being HappilyMarried and with children. By the end of the series, this obsession has left Vlad with nothing, not even Jack's friendship.
** "The Fright Before Christmas" shows that just because you've had rotten Christmases in the past, doesn't give you the right to be a jerk on the holidays, especially to people who love the holidays.
* {{Squick}}:
** In-universe. Danny was quite disgusted that two of his enemies had a child.
** "Geez, I'm eating so fast I think I just swallowed my spork." Cue Danny intangibly ''pulling the spork back out of his stomach.''
** Dash forcing Danny to eat a pair of old, putrid smelling, stain covered undies...
* StrawmanHasAPoint:
** An argument against Sam's ranting towards Danny [[spoiler: getting rid of his powers]] in ''Phantom Planet''. She calls him selfish, and he actually questions why what he did was selfish. Many people have actually taken Danny's side of the argument as his reasons were justified; his wanting to [[spoiler: be normal again]] was to protect his family from the ghost hunters searching for him, and in keeping with the perception that he was no longer needed as Amity's protector. It doesn't help with the above AlternativeCharacterInterpretation for Sam.
** "Double Cross My Heart" has the character Gregor want to start a relationship with Sam, while hoping not to spend anymore time with Tucker. Sam says that while "Tucker might be annoying, but he's one of my best friends, he's part of the package". However, Gregor's not wanting to have Tucker a part of his relationship with Sam was reasonable. 1) Tucker was constantly interfering with their dates and ruining the moment, 2) Tucker never stopped talking, 3) It isn't Tucker he's dating, it's Sam.
** "The Fright Before Christmas". Sure Danny needed to learn his lesson about not ruining the holiday for everyone and let go of how crappy his past Christmases were, but he wasn't exactly wrong to be upset given his parents arguing the existence of Santa, to the point of not even noticing when they put their son in danger. If anything, someone should have taught THEM that arguing over the existence of Santa Claus should not be more important than making their family happy.
* SuspiciouslySimilarSong:
** One of Music/HermansHermits' "I'm into Something Good" during a montage in "Double Cross My Heart".
** Harold Faltermeyer's "Axel F" as Danny surveys his parents' very [[TheEighties 80s]] college campus in "Masters of All Time".
** ''Walking On Sunshine'' plays as the parents depart for the [[spoiler: fake]] cruise in ''Pirate Radio''. In-universe, nobody notices that the muzak that's playing in the same episode is an easy-listening remix of [[spoiler: [[{{Foreshadowing}} Ember's theme song]]]].
* TakeThatScrappy:
** Despite being the comic relief, Tucker Foley isn't that liked by several fans, finding him unfunny and never shutting up about technology or girls. In the episode "Double Cross My Heart", Sam has a new crush who seems like a decent guy, but then he finally snaps and yells at Tucker, which causes Sam to realize he's a jerk and breaks up with him. [[UnintentionallySympathetic Even though he's the bad guy in this conversation, many actually agree with what he had to say about Tucker]].
-->'''Gregor:''' Dude! Do you ever stop talking?! Do you even know how ''obnoxious'' you are with your stupid jokes and your lame-o technology? IDIOT!
** In ''Girl's Night Out'', Jazz calls out Sam for her bossy behavior and failed planning. It was a welcome thing to hear.
* TheyWastedAPerfectlyGoodCharacter:
** Danielle, for those who don't consider her TheScrappy. Had the series continued along with her subplot given more than two episodes, [[spoiler:she was to eventually be accepted by the Fentons and become Danny's little sister]]. Considering the episode she debuted in feature Sam and Tucker tired of being sidekicks, Danielle could have easily filled this role too. Doing this might have also developed Danny's character further as [[BigBrotherInstinct a big brother]] and [[BigBrotherMentor a mentor]].
** Remember [[spoiler:Dark Danny]]? Danny's evil counterpart who was more powerful that him, had a complete lack of any sense of good in him and, considering he exists outside of time now, no longer needs Danny alive so he can easily kill the ghost boy? Did you know he was supposed to be the main villain of the season finale. Apparently Butch Hartman and the new co-producer, Kevin Sullivan, decided that we needed more reminders that Danny liked Sam in season 3 instead of bringing [[spoiler:Dark Danny]] back.
** Valerie almost completely stopped appearing outside of cameos midway through season 2. Though she had one major role in season 3, otherwise it seemed as though the writers didn't know what to do with her. Even during "Reality Trip" where everyone in Amity Park found out that Danny was a ghost we never see Valerie's reaction.
** Several new villains like Undergrowth and Noctune had interesting looks but botched by typical "rule the world" plots and more Danny and Sam shipping. (To be fair, Undergrowth had an excuse.)
** Bullet had a cool design and would've made good foil and dragon to Walker. However he only worked with him in one of his episodes and barely got any attention.
** The final episode featured a team of ghost hunters hired by Vlad called "The Masters Blasters", giving Danny a hard time and making people love them instead of him. The idea of Vlad having a team of ghost hunters working for him might have made them a decent QuirkyMinibossSquad and rivals to Danny... if they didn't appear in the very last episode.
** Freakshow, the only villain in the series who is human, since the others are either a half-ghost or just amoral ghost hunters who [[FantasticRacism see ghosts only as monsters]], could have been a cool re-occurring villain, especially since, unlike the other humans, including Vlad, he doesn't use technology but magical items. Also, he's shown having "ghost envy" and feeling everyone cares more about ghosts than him, which made an interesting foil to Jazz, who noted the same feeling at times. He's only used in the season one finale and in the third two-parter of the series... and that was it.
* TheyWastedAPerfectlyGoodPlot: To be fair, Season 3 had some good ideas. However, it was all botched due to rushing some subplots, as well as forgetting others or not giving them proper conclusion, Vlad's VillainDecay making him less impressive as a villain as well as appearing when not needed, constant ShipTease between Danny and Sam that even shippers felt was unnecessary and unneeded episodes (one example is Livin' Large, where Danny literally changes his opinion on being rich in the middle of the episode and becomes greedy for no reason).
** Danny finally frees Wulf, but the episode this occurs in only features this in the second half of it, the first half is more of an unrelated summer camp story.
** Danielle's subplot of being unstable was going to end differently, [[spoiler:with the Fentons adopting her]], instead she's stabilized by a miracle "Fenton gadget of the day" and goes off on her own again... in only her second appearance.
** Valerie learns the existence of half ghosts and that her hate for them made her a pawn of Vlad Plasmius, vowing to make him pay... right before the series finale.
** Also, in the episode Valerie becomes a ghost hunter, Tucker attempts to establish a relationship with her. Although she at first dates him because of his knowledge on ghosts, the end of "Shades of Grey" implies she started to reciprocate those feelings. However, by her next appearance, not only is Tucker over Valerie, he's outright rude to her. This route could've granted Tucker some much needed character development with dueling loyalties, but was removed in favor of Valerie becoming Danny's love interest.
** Several people felt "Reality Trip" would have gone better if Danny didn't erase his secret identity from his parents' memory. If they still knew then Danny wouldn't have to worry about them hunting him like in "Forever Phantom" and they would have been much more helpful if they were aware, from stabilizing Dani to knowing not to trust Vlad. If anything, erasing their memory, especially when they made it clear they loved their son no matter what, wasn't [[StatusQuoIsGod restoring Status Quo]] so much as not letting characters develop and keep plots repetitive.
*** Many were also disappointed that we didn't get to see Valerie's reaction to Danny's identity being revealed.
** Thanks to [[ExecutiveMeddling Steve Marmel not being a part of the show anymore]], many story arcs from the first two seasons were dropped. The above mentioned Danielle and Valerie stories were among them. Other examples being the return of [[spoiler:Dark Danny]] and Vlad's deal with the Fright Knight. These could have been explored in season 3, instead of an episode devoted to... the Box Ghost.
** The "The Ultimate Enemy" set up the possibility that Vlad might see the error of his ways one day and reform, sadly he never did.
* UnintentionallyUnsympathetic: A common argument against Sam in the episode "Double Cross My Heart". She is extremely angry at Danny for spying on her during her date with Gregor, despite that she did the same to Danny during his time with Valerie. Unlike Sam, Danny had legitimate reasons since they knew nothing about Sam's new crush and Danny didn't realize at the time he was jealous. Further, the exact same thing had happened before (Johnny 13 had taken an interest in Jazz, and her life was in danger as a result). Not to mention Sam is never called out for her own actions. Instead, it's Danny who apologizes while Sam laments that lying is the only way she can get a boyfriend.
* VindicatedByHistory: With the BrokenBase for Butch Hartman's [[WesternAnimation/TheFairlyOddParents other two]] [[WesternAnimation/TuffPuppy shows]], many consider this series to be Hartman's best show in recent years. It is the only cartoon of his that hasn't been considered DeaderThanDisco and still enjoys a healthy fanbase. Yet it is also the only one Nickelodeon rarely airs anymore.
* TheWoobie: Danielle "Dani" Phantom. Ignore whether or not you think she's [[TheScrappy a bad character]] or [[TheyWastedAPerfectlyGoodCharacter a wasted one]]. What we see is a spunky young girl who kicks butt, then think about what REALLY happened with her. She's a little girl who was emotionally manipulated by her father to do bad things only to find out he never loved her. Then there's her second episode where she's betrayed by a person she helped and had the one person who cares about her captured. Then she's TORTURED to death by her father, who she very likely still cares about since she gave him the benefit of a doubt and asked if he found a way to fix her. Not to mention all that time between the two episodes she was effectively dying a slow, horrible death while living on the streets.

----