And sometimes, even a well thought out wish can backfire, as shown in the episode Just The Two of Us, showing that Timmy is indeed a Cosmic Plaything and Butt Monkey.
When Chester got Norm as his Fairy, his wishes make everything worse for the world. Wishing the penguins weather would get warmer, the Earth gets closer to the sun melting the polar ice caps.
When Cosmo becomes Super Not-Cosmo some of his heroics ended up becoming worse, the dam he fixed bursts, the volcano he plugged erupted, and the cat he picked up a tree was a tree cat that goes berserk when its out taken out of its tree.
Karma Meter: In "Power Mad," where Timmy wishes up a challenging virtual reality game in which you can die if you lose your three lives and Chester and A.J. get stuck in it, Timmy sacrifices his own last life to save theirs. The game rewards him for his Heroic Sacrifice with enough points for a 1Up.
Kid Hero: Timmy Turner. While he usually fits the trope Designated Hero, there have been situations where events have been beyond his control. When this happens, he WILL step up to the plate and become a genuine hero. Wishology is the best known example of this.
Lethal Chef: Subverted with Timmy's mom. Her food looks absolutely revolting and is heavily implied to be alive. When the other characters finally give it a chance, though, it turns out to be gourmet quality.
Logical Weakness: In season three episode twenty six H2Olga is defeated not by the Crimson Chin's superpowers, but by being absorbed into the diaper of the baby he was watching.
Adds a bit of insult to injury on the Ursula-esque villainess's part that the diaper was ultra absorbent absorbing not only her but the large amount of water that flooded chincinatti from Timmy's bath that gave her the power to nearly beat the Chin.
Even more so that this happened only a minute after she was monologuing up against the walls of her absorbent, baby-powdery smelling prison about getting revenge on the chin as soon as she got out of it.
Low-Speed Chase: Timmy is trying to outrun his mind-controlled friends, who are trying to capture and brainwash him. However, their scooters are set to a mere 2 mph — any faster would mean they would spill their milk (the source of the mind control).
In another episode, the evil bug that crawled up Vicky's butt inhabited the President of the country and made him bring out a button that could destroy the planet. At the end of the episode, Cosmo pushes it and destroys Pluto.
"He said THE planet. He didn't say which one."
Actually, the President just happened to have the button with himself. The bug never made it to...er, the President's butt.
In one episode early on in the series, Cosmo was required to do one sufficiently evil act within a 24 hour period or his fairy license would be revoked and he'd be sent back to training. After consulting Vicky for advice, she suggests he blow up the Earth, and he would have done it, if not for the fact that he reverted back to his normal self at 12:00:00 Midnight, and the Earth would have otherwise blown up at 12:00:01 AM.
In the same episode, Wanda says that for her evil act she wiped out the dinosaurs.
Blowing up planets seems to be a standard affair for the Yugopotamians.
"We wouldn't have to blow up all these planets if you just stopped and asked for directions!"
The Movie: Holds the record at Nick for the most made-for-TV movies with a total of 10 films so far. (12 if you count the Wishology movies as separate films)
Wishology is especially notable given Nick's standards of what a "movie" is. Atlantis Squarepantis was called a movie. It was 30 minutes long. Wishology is two hours twenty four minutes, and is the only episode of FOP (besides the live-action movie) broadcast in widescreen high definition.
Mundane Made Awesome: Twistory. Aside from the episode itself (alongside Hail To The Chief, tied to it) being a glorified educational episode, it doesn't just involve Timmy doing his essay by directly asking the Founding Fathers themselves, but for doing so, Timmy hosts a self-titled talk-show, the "Timmy Turner Show". Filmed in Timmy's treehouse. Timmy himself just seems to be screaming to the audience, like, "hey look, it's educational yet entertaining". However, when his wish (as usual) backfires, since the Founding Fathers' absence from their age turns the States back to the British colony they once were, well... I think you know what happens.
Mundane Wish: Crocker teams up with Norm the genie but instead of simply wishing Timmy to Mars (as Norm suggests) or simply wishing to have a fairy in his possession he wastes his wishes on parts for ridiculous traps that backfire on him. Norm allows Crocker to wish for more wishes — which he does by wishing for them three at a time — and continues to waste them.
While many of Timmy's wishes seem wasteful, they don't qualify because he has unlimited wishes. In fact, it's actually bad for the fairies if he doesn't constantly wish for things
Musical Episode: School's Out: The Musical. The holiday specials also feature musical numbers.
Especially in light of the Wishology special. This special had featured a considerable amount of Character Development for many of the minor characters. In particular, the main character, Timmy, finally was Genre Savvy. Subsequent seasons show NONE of these developments.
No Sympathy: In the episode Bad Heir Day, Timmy, who has risked his life trying to find his godbrother, Poof, is given no sympathy by Wanda despite it being clear he's a Badly Battered Babysitter, mostly because he lied to Wanda about Poof's whereabouts.
Timmy: (holds up a net) Mom, don't ask why, but I have to stick this in Dad's pants.
Mom: Oh, is it Fathers Day already?
We never do find out exactly why Mr. Crocker was banned from entering Cincinatti, although one can safely assume it probably had to do with proving the existence of FAIRY GODPARENTS!!!
Not Allowed to Grow Up: All the kids. In fact, there have been various episodes depicting the last day of school (all of which pay no mind to continuity) yet they all stay in the same class, in the same grade, with the SAME teacher!
In addition to the multiple summers, one movie explicitly takes place one year after he got his fairies, which is retconned to have happened a year earlier.
Averted by the live action movie, which will show the future of most of Timmy's human friends and enemies.
Referenced yet AGAIN in Timmy's Secret Wish, where we discover that apparently Timmy wished that everyone on Earth, including himself would never age so he could keep Cosmo and Wanda forever...which he did 50 YEARS AGO.
Omnicidal Maniac: The Darkness Subverted when its discovered when it was only attacking out of self-defense, and it wasn't really evil at all.
One-Winged Angel: Evil Jorgen in "Action Packed", when he absorbs so much magic that he becomes ludicrously muscular in appearance and far more powerful. Fortunately, the transformation is quickly reserved, not only sucking out the stolen magic, but also sucking out all of Evil Jorgen's magic, leaving him frail, bone thin and powerless.
The Lead Eliminator into The Destructinator
Only Child Syndrome: It's easier to list the aversions: Tootie and Vicky, Cosmo and Schnozmo, and Wanda and Blonda. Almost every character in the series lacks siblings.
Or So I Heard: Big Wanda When Wanda takes over her father's business, she put a ficus in the meeting room. One of the men comments on a gardening tip for it, then quickly invokes this trope when the others stare at him surprised.
"A ficus? That's gonna need more light... not that, I would know."
The Other Darrin: Robert Cait replacing Norm Mac Donald as the voice of Norm the Genie, Butch Hartman replacing Gilbert Gottfried as Dr. Bender, and Jason Marsden replacing Frankie Muniz as Chester, to name a few.
Papa Wolf: Often averted for both Cosmo and Timmy's Dad. Whenever their respective sons are threatened they try to be heroic... with mixed results.
Paper-Thin Disguise: Several. For example, Timmy's "Cleft the Boy Chin Wonder" superhero costume. Even though having a red costume with yellow cape, boots and gloves, as well as black briefs and a black mask, the buckteeth and the red variant of Timmy's typical pink baseball cap give it all off. And we thought costumes were effective in keeping vigilantes' true identities hidden...
When he breaks in Dr Benders lair to retrieve Chip Skylarks teeth, he has several items given by the tooth fairy to help him, one of them is a tiara which hides his identity, and Dr Bender can't tell its Timmy with it.
Parental Neglect: Timmy's parents are quite neglectful and extremely selfish. They do love him though; they're more like adult children than truly evil abusers. Still, there are times when they put Timmy's happiness after their own, and in the "Wishology" trilogy they fail to notice he's been in Fairy World for an extended period of time, and don't notice they forgot to take him on two family vacations. It speaks volumes when, in part one, Timmy shrugs off the fact that they don't remember they have a son. The mother has even openly spent Timmy's college fund on stuff for herself when viewing the home shopping channel
Played for Laughs when his parents are busy watching tv about a show called the Bad Parent Hunter. So that Timmy won't disturb them, they hand him a bottle of acid and tells him to go play in the street - which he does
Guess who Crickey the Bad Parent Hunter was hunting?
Picked Last: Timmy Turner was picked last for everything in Dimmsdale to the point where he got Cosmo and Wanda to make him the most wanted kid in the world. (And by wanted....let's just say that both FBI and CIA wanted him).
Plumber's Crack: In "That Old Black Magic", Timmy's Dad was so afraid of the bad luck associated to stepping on cracks on the floor he dedicated himself to sealing all cracks at the amusement park he took his family to. That included the crack of a repairman working at the park.
Pluto Is Expendable: They blew it up in Vicky loses her Icky (the bomb was supposed to blow up a planet; it never said which one)
Pokémon Speak: Poof, but he can say other things, including Timmy's name.
Da Rules probably averts this, (we haven't even seen the whole book) but what about the Magic Muffin? You can take bites out of it and as long as you don't eat the whole thing you can still nibble it for more wishes!
Precocious Crush: The episode where Timmy wishes up the 18-year old Tommy Turner, whom the 10-year old Tootie falls in love with. And the fact that Tootie is genuinely in love with him is a major plot point of the episode.
Pro Wrestling Episode: A partial example in "Odd Jobs" where Timmy's dad faces of against Crusher McPersoncrusher.
Properly Paranoid: Subverted in "Operation Dinkelberg". Knowing that Timmy's Dad thinks he's an evil villain who's responsible for all of his problems, Dinkleberg pretends to be just such a villain - For no other reason than to give Dad the pleasure of thinking he was right.
Prophetic Name: Mr. and Mrs. Turner were nicknamed Mom and Dad as children
This is lampshaded in an episode. When Timmy goes back to the past, he sees his parents moving into what would be his house. In the moving trunk are pink things because his parents thought they were having a girl. What's sitting on top is his infamous pink hat.
Refugee from TV Land: The Crimson Chin taken out of his comic. This results in him discovering he is imaginary he grows giving him depression resulting in his series almost getting canceled.
Reset Button: Wishing things back to normal, along with once having a literal reset button in the form of a watch.
Retcon: A comic story revealed this in regards to the Crimson Chin's origin
Retconjuration: Some of Timmy's wishes have permanently altered the world he lives in. For example, the mountainous snow-capped central American country of Tibecuidor has always existed.
This came to a head when Timmy wished he was always right; instead of being magically prevented from saying something wrong, reality itself would be bent and altered to satisfy whatever Timmy said. Some of the changes took place immediately after Timmy mentioned them and were noticed by others (AJ wanted to study Timmy after he said there were only 49 states and the Dakotas merged into one state immediately thereafter), but some ("No I don't! I don't have fairy godparents...!") seemed to silently rewrite others' perceptions (Mr. Crocker suddenly becoming placid and saying "oh, okay then" after Timmy makes the previously-quoted claim).
Ret Gone: Happens to Poof in Wishy Wash, for unconventional reasons, the person that remembers Poof is Timmy