Deliberately Monochrome: Used when they turn the show into a Noire style detective film trying to find out who kidnapped Wanda.
Jorgen: "And why is that corner of the room still black and white!?"
Used twice in "Meet The Oddparents" to the same effect as above.
Demoted to Extra: Timmy's best friends, Chester and A.J. From being two major characters in the early seasons, they now appear very sporadically, often in non speaking roles. A.J. seems to have suffered the worst from this trope and for the live action movie, they appear in at most three scenes and they only have an interaction with Timmy in next to the last scene.
It's most evident with Veronica after season five and Francis after season six.
Trixie Tang seems to have suffered from this also, especially after Season 7. Tootie as well besides the live action movies.
Don't forget about Vicky. She was the main antagonist in the early years of the show, but nowadays she rarely shows up after the intro video.
Devil in Plain Sight: Subverted. Pretty much everyone in Dimmsdale knows Vicky is evil, especially her parents. It's mostly Timmy's parents who don't know it. The one time they DO figure it out in "Channel Chasers" Timmy hits the Reset Button.
Happens in the episode "Squirrely Puffs" as Mrs. Turner leads her troop of Cream Puff girls up a mountain, only to be accompanied by all the woodland creatures. They are eventually driven insane by the animals' constant singing, braiding of their hair and moose massages. The animals turn feral.
Disproportionate Retribution: In the Halloween Special, Remy Buxaplenty's father unleashes hounds on Timmy and his friends because he thought their costumes were bad.
Double Standard: Abuse, Female on Male: Vicky and her abuse of Timmy is often Played for Laughs although still not to the extent of most other examples. It is shown that Vicky's abuse does have a negative impact on his life in several instances. Indeed, it is one of the reasons -if not the main reason- he has Fairy Godparents.
Inverted in one episode where Timmy wishes to be Vicky's babysitter and gets some revenge. He's completely played out as the bad guy, at least until kid Vicky gets the fairies and goes mad with power, and tries to kill him. Then Timmy's the hero again and tricks her out of it.
Downer Ending: "The Secret Origin of Denzel Crocker", where they can't fix Crocker
Driven to Suicide: Timmy very nearly in the Wonderful Life subversion episode, It's A Wishful Life, although neither the word suicide nor the word death is spoken, Timmy's offer to erase himself from existence is essentially an offer to kill himself.
Egopolis: Crocker when he takes over the world in Abra-Catastophe.
Elemental Plane: One episode had several. When Timmy wishes to become a fairy and attempts to get to "Fairy World", he first ends up in "Scary World" and "Hairy World". A cow then shows up in Hairy World asking if she's in "Dairy World".
Endless Winter: In the TV special "Christmas Everyday!" one of the consequences of Timmy's everyday is Christmas wish is that everyday is a snow day. This made it extremely difficult for him to travel to the north pole to get Santa Claus' help in cancelling the wish.
Chip: "Sometimes it's hard being pretty and talented"
Timmy: "And delicious!"
Timmy: "Uh, my dad said that"
Also implied for Timmy himself if Sanjay's obsession with Timmy is any indication. When he became Timantha, A.J. became very smitten with him/her. Also when Timmy was aged up to 16 year old super modelboth Chester and A.J. seemed to swoon over him
Even Evil Has Standards: Crocker may be obsessed with hunting fairies, but when it comes to Poof, he lets him go back to Cosmo and Wanda.
Also, the one line that Vicky will not cross in regards to her horrible babysitting skills is abandoning her charge or losing sight of her charge, as evidenced by her genuine horror when Timmy seemingly disappeared under her watch.
Her only fear was for what'd happen to her because of that. To make things clear, the first thing she did upon finding Timmy was exclaiming "I'm saved!".
Everyone Looks Sexier If French: Parodied with Juandissimo Magnifico, who is never in a scene wthout talking about how muy, muy macho he is. He also has a habit of tearing shirts to shreds by flexing his muscles. And then magicing a new shirt into existence. And then flexing that one to pieces. The lady fairies love him.
Everything but the Girl: Timmy's wishing routinely alters the course of human history... but he can't get the girl, because fairies are not allowed to interfere with true love.
Timmy finally wisens up enough to make a wish where he and Trixie are the ONLY people on Earth, and thus Trixie will have no choice but to notice him. He quickly discovers Trixie's obsessive NEED for constant attention and tries to do everything in his power to get away from her.
With a fantastic moral to go with it.
Timmy: "Note to self: Never break up with a girl in the Violent Gardening Tool section"
Evil Overlord: Crocker and Vicky in Abra-Catastrophe and Channel Chasers
Also the Giant Brain in the episode "Future Lost"
As a Running Gag in the Ms. Dimmsdale Pageant episode, the one who recieves the prize to be 'Mayor for a day' is imagined to be this. Mr. Turner wins and makes this happen the exact way it is imagined.
Exact Eavesdropping: Used to varying degrees often enough, but played with most notably in "Grass is Greener" where Timmy's eavesdropping at precisely the wrong moments leads him to run away from home.
Exhausted Eye Bags: When Timmy makes a wish where no one had to sleep, everyone in Dimmsdale gets bags under their eyes from fatigue, and various other Gross-Up Close-Up aliments coming from not sleeping.
Eye Beams: Timmy wishes for this in Father Time, and gives it to his parents when they become the super heroes Mighty Mom and Dyno Dad. Timmy uses this power later when saving his parents, friends, and back-up friends in Unwish Island.
His dad's version, though is accidentally meat vision instead of heat vision.
He has both. He's just that awesome.
His parents briefly believes Timmy has picnic vision.
Flanderization: Pretty much every character has gone through this as the series has progressed:
Overtime Timmy became more and more of a selfish self-centered Jerk Ass, season 6 seems to have brought him down a few pegs but it still shows up every now and again.
Cosmo was originally a fairly competent goof with a semi-suave voice that knew what he was doing most of the time, over time his voice has cracked and become more and more shrill over the years and his intelligence has dropped to the point were he shouldn't even be able to function let alone live.
Wanda in the beginning was just another half to Cosmo, but for the most part was a diligent thinker and the smart one. Now she's just a naggy know it all.
Momma Cosma originally stated that she hated Wanda because she hates any girl Who would date Cosmo. Now? She'll go so far as to abandon her plans if it would make Wanda miserable.
Timmy's parents were originally loving caring parents that only needed time to themselves, yes they did have some eccentricities but for the most part they were stable, now they're more stupid if anything and just barely give two licks about their own son. They've repeatedly stated that they wanted a girl and even told their own son to his face thy never remember his birthday, when earlier on that wasn't the case.
Vicky was originally more of a schoolyard bully, the worst she would do to Timmy was property damage and blackmail and that was rare, she never tried to hurt him directly because her job entails she keep him in one piece! For the most part though she did do her job, that time Timmy wished he was an adult? She was truly worried about where he was and actively tried to find him even calling the police for assistance! Granted it was mostly because she wouldn't get paid if she lost Timmy, she still DID HER JOB! Now? She's an insane chainsaw wielded red headed cackling witch that will actively try to KILL HIM! when she was watching Timmy at her house, when the place got trashed she honestly was afraid her parents and knew they'd flip when they saw the mess. Now it's known that her parents fear HER! And it's implied she's been evil since she was born! Not to mention the fact that if she lost her job babysitting Timmy the entire universe would feel her wrath.
Tootie at first only had a crush on Timmy, now she wants to get a law made that would make him her property and when she's cheering him at one point mentions she stalks him every night. Her crush has now grown into an obsession and while not truly evil she's become almost as bad as her sister Vicky.
Crocker was at first a hilarious but still very competent fairy hunter who mind you in Abra-Catastrophe successfully captured Cosmo and Wanda and took over the universe! Now he's more angry, bitter, depressed and crazy rather than evil and crazy, at times you actually feel like you WANT him to win now because you just start to feel bad for him.
Trixie at first was the rich girl that kept rejecting Timmy's love for the more popular boys, but she still occasionally felt bad for him, heck in one episode it was revealed she's a tomboy and shares much of Timmy's interests, in short she was a realistic portrayal of the Alpha Bitch Now? She's a spoiled rich girl that will even go as far to have Timmy ejected from her property a stereotypical Alpha Bitch
Chester's gone from just being the poor kid, to a hobo that eats garbage.
A.J. Was originally just considered a kid of above average intelligence, while maybe being the smartest kid in Timmy's class. Now? He's a super genius black mix of Dexter and Jimmy Neutron.
Foregone Conclusion: No matter what, one day Timmy will be too old to have Cosmo and Wanda, and they will go away and he will forget everything about them, and make all the same mistakes his parents did that made him miserable as a kid.
Referenced in a VERY intriguing "plot-important" episode: As it turns out, Timmy secretly wished for the rest of humanity and himself to stop aging so he COULD keep his fairy godparents forever. When this wish is revealed, it turns out this wish was active for over 50 years. Though its still impossible for Timmy to have known about his future (at least it hasn't been shown on-screen), it almost seems like he made that wish to avoid this Foregone Conclusion).
Forgotten Anniversary: Cosmo believes Wanda is angry at him for no reason and has forgotten their anniversary (which he believed was the 'Styrofoam anniversary'). Turns out, it was the False Anger Anniversary (once every someodd years and was ironically on the SAME day as said anniversary Cosmo planned) and Wanda had remembered, but it's too late - he's gone home to his mom. They work it out anyway, only for Cosmo to forget it was their anniversary at the end of the episode.
Forgotten Birthday: Timmy's...every year, by his own parents. Eventually he stops minding because he realizes more birthdays means growing up and eventually having to give up Cosmo, Wanda, and Poof.
Special mention to the episode where he forgets his OWN birthday is a day later... The next day might not even be his birthday, on the account that his parents didn't seem that sure either, forgetting his name as they tell him.
Mrs. Turner: "We'd never forget your birthday, Tommy."
What's really sad is that in the episode "Birthday Bashed", its shown that Vicky actually remembers Timmy's birthday better than his own parents (She even give him a piece of cake, granted its right before she straps him to a rocket)
In one scene Mr. Turner even says "Why would we throw a party for you?"
Generation Xerox: At the end of the special "Channel Chasers", the future in twenty years is shown along with Timmy and Tootie's kids. Not only do they closely resemble their parents (aside from swapped hair color), but also, like Timmy, they were tormented by their babysitter enough to receive Cosmo and Wanda as their fairy godparents.
Genre Savvy: In the Wishology special at least. Timmy finally starts being responsible from when he makes his trilogy wishes in a controlled environment at the beginning to him being able to battle the Darkness and the Eliminators without access to magic.
In later seasons, Timmy arguably has a better understanding on how to use Da Rules and the workings of the fairy world. By the time of the live action movie, he has figured out a loop hole allowing him to keep his fairies well beyond their due date.
Geographic Flexibility: Dimmsdale seems to border the ocean, a desert, and snow-capped mountains. Fairy Idol would go on to show that Dimmsdale is actually in southern California. This sort of justifies all 3 environments if you take into account that it's never shown just exactly how far anyone ever travels to reach these areas.
In other episodes, Dimmsdale is shown to be in Northern California. If this is the case, then this is actually correct because there ARE mountains in California and ironically they're not far from the beach. Uncertain about the desert, though.
The southwestern extremes of the Great Basin Desert are within easy driving distance, but it doesn't resemble the deserts seen on the show. There are plenty of cattle sculls, but no saguaros.
In the episode "Meet the Oddparents", Jorgen invokes his authority from the city of Whittier, California while erasing Timmy's Parents memories. Whittier is just south-east of Los Angeles and part of Southern California. Its not much of a stretch to say that Dimmsdale is around this area with all the geographically diverse areas around it.
Getting Crap Past the Radar: In one episode, while Timmy's parents are watching the "Dr. Bill" show, trying to learn how to be better parents, he says "Does your child take toilet paper up to his room and tell you not to bother him?"
There are WAY more examples, but well, yeah, this IS a Nickelodeon show! Right, Spongebob?
The most blatant example might be the Cosmo-Con episode, where Britney Britney (the fictional celebrity parodying Britney Spears) introduces herself to the Turner family... alongside her "boys". Then, said "boys" (actually her own dancers) introduce themselves by doing what they do best: suggestive pelvic thrusts. Come on.
Another big example comes from Crocker "Ooh, the slap tango! Mother and I haven't done that in years!"
Girl Next Door: Vicky's sister, Tootie mixes this with Stalker with a Crush. In Merry Wishmas, she lived next door to Timmy in the spot Dinkleberg's house normally occupies. This is even more apparent in the live action movie.
Good Is Not Nice: Jorgen Von Stangle. Even though he is usually a good guy and enforces Da Rulez (the fairy laws) to the letter, he still gets kicks out of causing people, usually Binkie, pain and threatening violence following his Drill Sergeant Nasty stereotype. He has backed off from it somewhat in recent seasons after marrying the Toothfairy.
Gross-Up Close-Up: Fairly Oddlympics (the disguises of Anti Cosmo & Head Pixie), Cosmo having angry mood swings and giving insanely painful birth.
Growing Up Sucks: Timmy will eventually lose Cosmo and Wanda. It is revealed that he tried to avert this in Timmy's Secret Wish by wishing that everyone on Earth stayed the same age so he could keep them forever. A wish he made 50 YEARS AGO without anybody knowing.
Hidden Depths: Mr. Crocker's past was explored in depth in the special episode The Secret Origin of Denzel Crocker, which revealed most importantly that Mr. Crocker not only had fairies himself in his childhood, but he had Cosmo and Wanda, and was quite sane and similar to Timmy at age 10. Most later episodes support this fact, but exactly which fairies Crocker had are contradicted.
Hoist by His Own Petard: Evil Jorgen in "Action Packed", in which he's absorbed so much magic that he's swollen with HUGE muscles...and is promptly attacked by his cat, and he can't reach up to get it off, because his muscles are too huge, allowing Timmy to gain the upper hand.
A brilliant one is seen in 'School's Out: The Musical'. The pixies had a 36 year plan involving Flappy Bob to become a laywer and signing a contract to make the world as fun as he was as a boring adult lawyer overly concerned with education and safety. Unfortunately, this is backfired on them because Flappy Bob—having the skills of a brilliant lawyer—found a loophole in the contract to make the world defined 'as defined by him'. Now tell me, who raised Flappy Bob to become a lawyer?
I Drank What?: One episode revolved around Cosmo, Wanda, and Timmy attending a ceremony and Timmy having a Potty Emergency, trying to find somewhere to pee. The episode ends with Cosmo and Wanda drinking a yellow liquid from a pitcher, and Timmy saying "Speaking of relief, don't drink the punch!" Ewwwwwwwww...
Improbably Predictable: This takes place when Timmy wishes his parents had superpowers, then when he finds they are too busy with fighting evil that they can't take care of him, and wishes that they weren't superheroes, but Cosmo's and Wanda's wands don't work:
Timmy: Let me guess,
Timmy, Cosmo and Wanda: They've become so powerful that they are now impervious to magic.
Inconvenient Summons: When Norm gave Timmy a lawyer, the lawyer was playing poker. Norm himself is often a victim of this.
Interspecies Romance: Several times Cosmo has shown attraction to humans. The episode Truth or Cosmoquences suggests fairies don't have any trouble with that since Cosmo pretended to be married to Britney Britney and no fairy had anything to say against the idea of a fairy marrying a human.
It Will Never Catch On: In one episode, it was revealed one of Timmy's ancestors (Ebenezer Turner) could have become a railroad tycoon but refused because he thought trains would be just a fad. The job was taken by Orville Buxaplenty.