OnePiece/{{Tropes A-B}} | OnePiece/{{Tropes C-D}} | OnePiece/{{Tropes E-F}} | OnePiece/{{Tropes G-J}} | '''Tropes K-M''' | OnePiece/{{Tropes N-P}} | OnePiece/{{Tropes Q-S}} | OnePiece/{{Tropes T-Z}}

!!Tropes for OnePiece

* KamehameHadoken: King Neptune's Ultramarine.
* KangarooCourt: According to Nami, the World Government considers merely being sent to Enies Lobby enough evidence for either execution or a sentence at Impel Down. Criminals are simply walked through an empty courthouse and are immediately given their sentence. This is simply an urban legend, although the reality--judgment at the hands of the Eleven Just Jurymen (imprisoned former pirates hoping to drag any other criminals down with them) and Chief Justice Baskerville (an [[MultipleHeadCase insane, three-headed]] HangingJudge)--is hardly an improvement.
* KansaiRegionalAccent: Luffy spoke in the dialect when he tested a tone dial in Skypeia, calling Usopp a dork.
* KarmaHoudini: Eneru and Doctor Hogback get away with nothing more than some bruises. The first is the [[AGodAmI most]] [[OmnicidalManiac psychotic]] villain in the series, the second is [[{{Squick}} one]] [[KickTheDog of the most]] [[DirtyCoward disgusting]].
** Double-Subverted in Wapol's case, he ends up getting launched all the way to another island, forced to eat garbage and live as a bum, there he makes friends with a dog, it appears he's been humbled after losing everything, then a toy maker finds him and wants to pay him for the metal he can create from garbage to make toys. he ends up even RICHER than when he was Drum Islands King! [[spoiler:and after the Timeskip he's now the king of his own evil kingdom, officially recongnized by the World Government!]]
* TheKhan: [[spoiler:Moria's reaction to seeing Luffy again after his humiliation at Thriller Bark probably qualifies.]]
* {{Kiai}}: In Chapter 519, Luffy did this... and knocked out a large number of the Amazonian audience.
** And now another repeat performance by Luffy in Chapter 569 in the Marine Headquarters just as his brother was about to be executed, knocking out not only the executioner, but even some Marines and New World Pirates, as well as Mr. 3 disguised as the other executioner. As expected, this act captures the attention of every high-ranking person on both sides, [[OhCrap particularly Fleet Admiral Sengoku]]!
* KiAttacks: ''Haki'' (Ambition) is essentially this.
** [[spoiler:It is present in all living things and comes in 3 "[[InsistentTerminology colours]]": "Obsevation" (''Kenbunshoku''), AKA ''Mantra'', which allows the user to [[SpiderSense sense other living things and predict their actions]]; "Armament" (''Busoshoku''), which allows the user to [[FightingSpirit use their spirit as an invisible armor of sorts to enhance their attack and defense]], which can also be imbued into weapons; and "Conqueror" (''Haoshoku''), which allows the user to [[AwesomenessIsAForce intimidate others with weaker spirits than themselves into unconciousness]]. Only [[MillionToOneChance one in a million]] people can use that last one.]]
*** [[spoiler:Armament Haki can be used to harm [[NighInvulnerable Logia]] Devil Fruit users by "[[ArmorPiercingAttack touching the substantial body beneath the protection of a Devil Fruit]]"]].
* KickTheDog: Pirate Empress Boa Hancock's mission in life is to kick every [[RidiculouslyCuteCritter cute fuzzy animal]] that crosses her path.
--> "Just who in blazes had the gall to place a '''kitten''' in my path?!!"
** As about less literal examples -- ''how about every single significant villain?''
** Averted with Smoker, whose first scene looks like it's about to be a typical kick the dog moment: a little girl bumps into him, spilling her ice cream cone and ruining his expensive uniform. The look on his face implies he's about to do something terrible... but then Smoker apologizes for his pants "eating" her ice cream and gives her money for a bigger cone.
** This gets invoked By Rob Lucci, who tells Paulie that if he can't believe that his long time coworkers are actually WG assassins, Lucci would step on Iceburg's face to help convince him.
* KillerRabbit:
** Chopper. He is believed to be the ''pet'' of the crew and has the smallest known bounty of a known and acknowledged pirate: 50 berri. In truth, he is a deadly analytical fighter able of becoming a 50ft monster.
** A more literal example would be the Lapahn on Drum Island.
* KillThePoor: A flashback shows this happening in Luffy's home island in an effort of "clean things up" before a visit of the [[AristocratsAreEvil World Nobles]].
* KneelBeforeFrodo: King Nefeltari Cobra at the end of the Alabasta arc.
* KnifeNut: Buggy is a standard example. Surprisingly, Sanji also qualifies. Though he is loath to use his hands in battle, when fighting in a kitchen against an opponent who uses food as a weapon Sanji demonstrates impressive skills with a pair of knives to dice up the enemy's food weaponry. He won't use them to actually draw blood, however.
* KnightOfCerebus: Arlong is arguably the first to ''really'' raise the stakes for the Straw Hat crew, then follow this up with an enemy Luffy can't fight in the form of Smoker... it's clear that the world of the series is changed forever.
* KnightTemplar: Many of the notable underlings of the Word Government. Some of the others, like Smoker, ''seem'' {{Knight Templar}}ish, until you remember that ThePiratesWhoDontDoAnything, like Straw Hats, actually are ''exceptions''.
** Admiral Akainu in particular deserves a honorary mention for blowing up a refugee ship out of suspicion that some people, targeted by the World Government, might be aboard.
*** [[spoiler:And later on, almost killing Coby just because he was trying to talk some sense into the other Marines. They had technically achieved their objective, but were ruthlessly going after the fleeing pirates and leaving their wounded Marine compatriots behind]].
** And [=CP9=], but especially Rob Lucci, whose personal doctrine of "Dark Justice" marks extreme KnightTemplar tendencies.
* KnightTemplarBigBrother: Oddly enough, this can be played straight AND inverted. Ace has proved, with Blackbeard, that he's perfectly serious about pounding in anyone who even considers hurting Luffy. Luffy, despite being the younger brother, has recently [[spoiler:broken into the One Piece world's most highly guarded prison, let loose hundreds of convicts, and wrecked havoc all across the Marine HQ all for the sake of rescuing his older brother, Ace]].
* KnowWhenToFoldEm: For a series stuffed to the brim with {{Determinator}}s, there are at least a few moments when "cut and run" is thought of as a viable tactic. [[spoiler:The most recent example is during the Whitebeard war, when the arrival of Shanks convinces Sengoku that taking on a fresh Emperor and his crew ain't exactly the brightest move. He's all too willing to make concessions just to keep the peace.]]
** Also, when the Straw Hats are surrounded by the powerful Haki-using Sentamaru, Kizaru (an Admiral), multiple Pacifista, and Bartholomew Kuma. They decide to run. [[spoiler:It doesn't work]].
* KnuckleCracking: Luffy's LetsGetDangerous moments.
* KrakenAndLeviathan: Aside from the world having some of the biggest (and most absurd-looking) sea monsters to exist, [[spoiler:the Straw Hat Crew's new TeamPet is a literal Kraken.]].
* KryptoniteFactor: People with Devil Fruit powers can have their abilities stripped away through contact with Seastone or by submerging them in water (which they're unable to swim in, and which cancels their powers). People who ate Logia Devil Fruits often have unique weaknesses. Such as sand is ineffectual against water, and electricity won't work against rubber.
** [[spoiler:Poison is ineffective against wax. Even Mr. 3 was surprised by that one.]]
* KryptoniteIsEverywhere: While the Marines make liberal use of Seastone, they almost never use it offensively, instead making ship lining and handcuffs out of it.
** The guards in Impel Down was shown using cannons loaded with Seastone nets, so they appear to be learning.
** Smoker has his jutte tipped with the stuff.
* KudzuPlot: It's what you get when there's LoadsAndLoadsOfCharacters and 700 chapters and counting.
* {{Kuudere}}: Robin. Most of the time, she's calm and doesn't usually participate in the crazy antics the rest of the crew end up getting into. I say "most of the time" because during the later part of the Water Seven/Enies Lobby arc, she eventually burst into tears and begged Luffy and the others to save her.
* LadyLand: Amazon Lily Island
** Inverted when [[spoiler:Sanji is sent to an island full of transvestites]].
* LadyOfWar: Nami; Nico Robin; Boa Hancock; Hina
* LampshadeHanging: Chapter 577 is appropriately titled, [[{{HSQ}} "Major Events Piling Up One After Another"]].
* LandingInSomeonesBathtub: PlayedForDrama. Luffy drops into Hancock's bath, but he isn't flustered about it at all. Hancock is not ashamed of her nudity in the slightest either, but she does try to kill Luffy because he saw a shameful mark that was branded upon her back.
* LanternJawOfJustice: What's hidden inside Hannyabal's chin? COULD IT BE DREAMS??!!
* {{Laser Guided Amnesia}}: After meeting the cute mermaid Camie, Zoro promptly deletes his memory of having met the not so cute mermaid Kokoro through sheer willpower. See chapter 491.
* LateToTheRealization: Surprisingly both played straight, subverted, and averted within the span of a few minutes during the halfway point of Luffy and Foxy's match during the Groggy Boxing round of the Davy Back Fight. While hunting down Foxy in his own cabin, who (Foxy) had just used his Foxy Face Transformation in an attempt to throw Luffy off. Luffy runs into a random room where he crosses paths with Foxy, who is donning a ridiculously-oversized PaperThinDisguise of a woman's mask. Luffy, being the IdiotHero that he is, actually falls for it, only to walk out for a few seconds and then put the connection that the "woman" had the same chin as Foxy, bringing his own train of thought to the conclusion that the "woman" that he just encountered was Foxy's sister. Luffy still holds on to this belief, even after Foxy launches a surprise attack and makes a break for it right in front of his face,believing that Foxy's "sister" was purposely distracting Luffy from Foxy's "true whereabouts."
* LaughablyEvil: Ooh boy, where to start ? Buggy The Clown, and even that is because he's sensitive about his nose. Wapol when he ate the fat out of his body and became slim. Mr. 4 and Miss Merry Christmas, and Mr. 2 Bon Clay before his HeelFaceTurn. Foxy when he acts [[SmugSnake very arrogantly]], only to be insulted and feel down. Spandam in every scene where he isn't doing something horrible, including when he burnt himself with his own coffee. And some Lampshade Hanging of when Kaku of [=CP9=] turned into a giraffe.
** Boa Hancock was as well, according to one amazon's words, "Looking down on someone so much, she's looking up!" But she wasn't so much evil than [[DefrostingIceQueen an ice queen waiting to defrost.]] And she did a HeelFaceTurn. [[JerkassFacade Although not in front of her subjects, though.]]
* LateArrivalSpoiler: Considering how much they have been shown and advertised, it's pretty hard not to learn ahead of time that Miss All Sunday (Nico Robin) and Franky turn good. The twelvth movie also expects you to be up-to-date with the manga, or at least have read/watched the Fishman Island arc, as it spoils two huge plot points revealed at the end of this arc.
* LawfulStupid: The World Government is ruled by a bunch of arrogant, disgustingly inept elites who are perfectly willing to ignore a massive prison break comprised of some of the worst criminals the world has ever known to save face and to focus on erasing out the remainder of [[spoiler:Roger's legacy]]. Brilliant, guys.
* LeaningOnTheFourthWall: On the last page of Chapter 597, [[spoiler:Luffy]] says "[[spoiler:The pirate 'Straw Hat Luffy']] is going on a holiday for a bit", then at the bottom of page it is announced that the manga is going on a four week break, its longest so far. We get it, Oda.
** There's also the part where [[spoiler:in chapter 627, after a seven chapter long flashback arc (One of the longest, if not the longest so far), Jimbei tells everyone that he's sorry that it took so long to tell them the whole story. Almost as if Oda himself is apologizing to the readers for the flashback taking so long by having Jimbei say it for him.]]
* LeaveHimToMe: [[spoiler:A heroic example. Even though Hody Jones has taken some of his crew captive, Jimbe tells Luffy not to fight Hody and leave him to Jimbe in order to stop the repeating cycle of hatred between fishmen and humans. However, considering the fact that Jimbe has been captured, along with the fact that Hody was the one who assassinated Otohime, he might've reconsidered]].
** [[spoiler:Until the reveal that Jinbe had (mostly) planned for that to happen, with the intent of allowing Luffy to fight Hody and come across as a hero to Fishman Island instead of a JerkAss who beat the crap out of Hody ForTheEvulz.]]
* {{Leitmotif}}: Each member of the Straw Hat crew except the ships have one that play during their respective eyecatches.
** Several of the movie villains, namely General Gasparde, the Wapol brothers, and Gold Lion Shiki all have recurring musical motifs in various tracks relating to them.
* ALessonInDefeat: Mihawk gives Zoro one at the Baratie.
* LethalLavaLand: Half of [[HailfirePeaks Punk Hazard]].
* LetsSplitUpGang: During the flight from the Pacifistas.
** Happens repeatedly in the Dressrosa arc. Currently the groups are: Luffy and Zoro are racing to the royal palace to [[spoiler: rescue the captured Law]]. Franky, Robin and Usopp are off to destroy the SMILE factory and [[spoiler: knock out Sugar to reverse the effects of the humans transformed into toys]]. Nami, Sanji, Chopper and Brooke have [[spoiler: set sail to the next island because Big Mom has come for Caesar Clown.]]
* LibationForTheDead: After the crew defeat Arlong, Genzo pours sake on Nami's adoptive mother's grave.
* LibertyOverProsperity: Luffy expresses little to no interest in treasure, and doesn't care if One Piece even exists. His main motivation for becoming Pirate King is to be able to have the most freedom. This goes even beyond safety or warnings, from fellow pirates and allies, or Lawful marines. He once declared war on the entire World Government because it got in the way of him saving his [[TrueCompanions crewmate]]. He'll do whatever the heck he wants, and damn the consequences; we're lucky he's a good guy.
* LightIsNotGood: Admiral Kizaru. That smile of his may fool you for a short time, but if you did any form of piracy in your life, then expect him to kick your ass, and a light-based explosion to blow you into itty-bitty pieces. The only reason why he doesn't go after the Seven Warlords of the Sea is because he's not legally allowed to. It's only mildly subverted (at least from his perspective) in that he believes he's right and the pirates, no matter what reason, are sinners.
** Another Marine example is Fleet Admiral Sengoku, a man who is nicknamed after the Buddha, and ''can actually transform into a copy of the Buddha'', yet he supports the fairly oppressive World Government's policies and tells Saul not to question his orders.
*** Sengoku has ''some'' morals, though. He did ''not'' like it when the WG decided to pretend the jailbreak didn't happen instead of putting out warrants.
* LightningBruiser: The zombie giant Oars. No, really. I know what you're thinking. The words "giant" and "[[ZombieGait zombie]]" would imply he's slow moving, but in a battle, he would disappear from the scene to give a serious counter-attack. He avoided Franky's ammunition ''at point blank range'' and knocked him out with a kick. Some LampshadeHanging was made on this. It was finally explained that since he had Luffy's shadow in him, he would have his agility. No, seriously.
** Also Lucci, Kaku, and Jyabura of [=CP9=] in their Zoan-produced forms, Nightmare Luffy, and Kuma.
* LilliputianWarriors: The gnomes of Dressrosa are a few inches tall. When they capture [[spoiler:Robin]] they even tie the person down like the Liliputians did to Gulliver.
* LiterallyShatteredLives: Aokiji's Ice-Ice fruit turns him into ice; it shatters when hit, but he can simply pull himself together like the [[TheTerminator T-1000]].
* LittleBrotherIsWatching: Discussed more than anything in the Fishman Island arc. A recurring theme throughout that arc is the CycleOfRevenge and central characters of the arc not wanting to pass their prejudices regarding humans on to the next generation, even when some of them could not let go of that hatred themselves. Arc villains the New Fishman Pirates are a case of CorruptionOfAMinor because that prejudice was passed down to them.
* LiveActionEscortMission: In the most recent flashback, [[spoiler:Fisher Tiger ends up having a recently freed human slave girl on his ship. For some reason, she just won't stop smiling. After he's told about what the life of a slave is like, Tiger decides to bring the girl home. He personally brings her back and all seems good... until Marines show up and try to kill him.]]
* LivingLegend: There are several powerful pirates who fit in this category, most notably Silvers Rayleigh, the Number Two of Gold Roger himself.
* LivingMacGuffin: Robin, most likely the only person in the world who can read Poneglyphs, and Franky, for being in possession of the Pluton's blueprints, both become this during the Enies Lobby arc.
* LivingWeapon: We have a dog and an elephant that were once a gun and a sword before eating a devil fruit. They can still act as weapons, so this is a type 1. [[spoiler: In chapter 649, we find out that Shirahoshi is a type 2. Being able to talk to and control FREAKING SEA KINGS makes her one of these. Her weapon name is even Poseidon.]]
* LoadsAndLoadsOfCharacters: Seriously. The author even gives names and backstories to background characters who don't have any speaking lines, and who may or may not turn out to be [[{{ChekhovsGunman}} Chekhov's Gunmen]] several hundred chapters down the line.
* LogicalWeakness: Numerous examples.
** Luffy's rubber powers give him resistance to blunt force and bullets[[note]]Although this is apparently only because ''One Piece''[='s=] firearms aren't so advanced yet--it's been stated that a modern round could pierce Luffy[[/note]], but leave him vulnerable to blades. They also allow him to NoSell Eneru's electricity powers. Heat also makes him rather runny.
** Crocodile's sand powers can be neutralized by getting him wet.
** Kalifa's powers are based on coating her targets in soap; their effects are easily neutralized by rinsing off the soap with water.
** Mr. 3's wax powers protect him from Magellan's poisons.
* LongRunner: One of the most famous. Running for more than 15 years with no end in sight and is the most popular manga of all time, bar none.
* LoonyFan: It turns out [[spoiler: Bartolomeo]] is one of these to Luffy.
* LoopholeAbuse: The Davy Back Fight allows the team that wins each match to pick a member of the opposing team and force him or her to join their crew. After winning the second round and the Straw Hats now may pick one person from Foxy's team, Nami considers choosing Foxy, who is set to compete in the Combat event against Luffy, so that they win by default in the third match and can easily get Chopper back. While some members of the opposing team hypocritically protest, Robin notes that this is legal, but none of the Straw Hats want Foxy with them.
* LossOfIdentity: [[spoiler:The sentient toys on the island of Dressrosa are in fact humans who were turned into toys because of a Devil Fruit user. While the toy creature retains all memories of their previous form, those humans close to him or her forget.]]
* LostTechnology: Pluton, Poseidon and Uranus.
* LoveCanMakeYouGonk: Sanji is rather prone to this unfortunate condition.
* LowerDeckEpisode: The cover arc for Coby and Helmeppo.
* [[spoiler:[[ILetGwenStacyDie Luffy Let Portgas D. Ace Die]]]]: Subverted. Said death was a HeroicSacrifice.
* LuckyCharmsTitle: The manga's logo, at least. The Straw Hats' jolly roger forms the O, a silhouette of Luffy forms the I, and the last E is a sideways anchor.
* LuckyTranslation: During the Amazon Lily arc, when Luffy [[ItMakesSenseInContext describes his balls]], he uses the Japanese euphemism "gold balls", resulting in Marguerite and the rest of the Amazons believing that they're just that. The fan subs and the English manga used the euphemism "family jewels" to achieve the same effect.
* LukeIAmYourFather: Luffy's father is [[spoiler:the world's most wanted criminal, Monkey D. Dragon]], and his grandfather is [[spoiler:the legendary Vice-Admiral Monkey D. Garp]].
** And then, our expectations get twisted when it turns out that [[spoiler:Ace's father is actually Gold Roger.]]
* {{MacGuffin}}: The "One Piece".
** The characters seem to think of it as something of a [MacGuffin] as well. Luffy turns down an offer of information about it because that would make his adventure less interesting.
** [[spoiler:Whitebeard finally gives some information on One Piece before he dies.]]
* MacGuffinTitle
* MadArtist: Mr. 3 likes to think of himself this way when he's turning people into wax statues. His partner, Miss Goldenweek, counts as an antagonistic artist too, but she comes across as less "mad" and more "working on commission."
* MadeOfIron: Everyone, but especially Zoro; while Franky and Mr. 1 are ''literally'' MadeOfIron.
** In actuality, Mr. 1 is made of ''steel'', so... yeah.
** Rokushiki's ''Tekkai'' (Iron Body) technique harden's the body like iron.
** Of special note is Jinbei, who somehow made a full recovery from taking a stream of lava through the ribcage.
* MadeOfIndestructium: Anything made of seastone is apparently "stronger than diamonds", which leads one to [[FridgeLogic question how it was cut]].
** Most likely [[CaptainObvious the same way diamonds are cut]]: with seastone dust applied on a milling cutter.
** Also, how have the swords in this thing not been mentioned? There are several people that can swing them hard enough to create ''shockwaves of air'', and in Mihawk's case, ''just one'' of which is powerful enough to ''split the top off of a freaking frozen tsunami hundreds of feet long''... how do they not just shatter? Or even get worn away?? Also, Rokushiki: Rankyaku has exactly the same effect, but it's performed with your ''legs''. Seriously. This trope is zig-zagged so much...
*** Averted with Trafalgar Law's devil fruit, and subverted with Zoro's regular swords in the Flashback Episode where he met Johnny.
* MadnessMantra: Usopp likes to say, when faced with an enemy or place he just got a scare out of: "[Name] scary... [name] scary... [name] scary..."
** Chopper seems to have picked up the habit a bit.
* MadScientist: Dr. Hogback, Vegapunk and, to a lesser extent, Franky.
** Caesar Clown, of the highest caliber.
* MagicAIsMagicA: Most of the Devil Fruit powers are given some sort of expository explanation beforehand, and they tend to be used very consistently.
** The general rules (Devil Fruit users cannot swim, there cannot be more than one specific fruit/power at the same time, etc) are consistent across the board. Any exceptions, either real (Blackbeard's Dark-Dark Fruit & Chopper's four extra forms) or imagined (Initially mistaking Thriller Bark's zombies as being the same as Brook) are typically unique and always [[LampshadeHanging Lampshaded]].
* MagicAntidote: ''One Piece'' [[ZigZaggingTrope zig-zags]] all over this one. Generally, healing actually does take time in the series, but sometimes, medicines and concoctions take effect instantly (the big example here is Chopper's Rumble Ball, which seems to activate as soon as he bites it). Sometimes, though, it's hard to tell if healing is actually genuinely complete after a few minutes, or if the characters are such {{Determinator}}s that they don't realize they haven't healed yet.
** Lampshaded early in the series when Yosaku appears to have immediately recovered from Scurvy. Nami points out that he shouldn't have healed so quickly, but he doesn't seem to hear her. [[SubvertedTrope He then faints again less than a minute after dancing around]].
* MagicMushroom: Luffy once ate a mushroom which caused mushrooms to grow all over him.
* MagicCompass:
** Rather than point north the Log Pose, a special compass used to navigate the Grand Line, instead points to nearby islands. This is because islands on the Grand Line have magnetic fields of their own so powerful they make any normal compass useless. Once you arrive at an island, the Log Pose "logs" the island after enough time passes and begins pointing to the next island.
** There is also the Eternal Pose, a compass permanently locked onto a specific island which can be used to navigate to that island and only that island.
** In the second half of the Grand Line, the New World, a Log Pose using three needles is used. The force with which the needles move are an indication of the danger level of the island to boot.
** A non-magnetism example would be Vivre Cards, slips of paper which are linked to a person's life force and can show where they are located. Put the paper on a table or in your hand, and it will move on its own in the general direction of the person it's linked to. Luffy had once for his brother Ace, which he used in his rescue attempt in the Impel Down arc.
* MagicPants: At least two-thirds of the Devil Fruit users. [[WordOfGod Oda]] justifies it by saying that if the Devil Fruits' users clothes changed along with them all the time, the series would have too much unnecessary nudity. Still, some fruit powers don't affect clothing, like Jewelry Bonney and Ain's [[FountainOfYouth rejuvenating abilities]], which leave the victims as children in oversized clothes. Honey Queen, a Logia user from one of the movies, also leaves her clothes behind when she transforms into her element.
* MagneticHero: [[LampshadeHanging Lampshaded]] by Hawkeye in reference to Luffy: "This is... the most dangerous ability in this world!"
* MakesJustAsMuchSenseInContext: In chapter 447 "That geezer-tree and... a unicorn are having a drink!"
* MakingASplash: While deadly enough on land, once in the water ''Fishman Karate'' of the [[FishPeople fishmen]] can produce effects like splitting waves and throwing around streams of water with the force of cannons.
** There's also ''Merman Combat'', which is basically the [[OurMermaidsAreDifferent merfolk]] equivalent of the above.
* MamaBear: Bellemere is the earliest example within the series. Chef Zeff and Whitebeard also serve as Papa Wolves. The queen of this, however, is Portgas D. Rouge for staying pregnant for nearly two years, by sheer willpower, to ensure Ace's safety.
** Post Timeskip, Nami shows signs of this when [[spoiler:giant children ask for her to help them get back home. She orders Sanji and the others to help them.]]
* ManEatingPlant: Lots of them on the Bowin Archipelago, the island where Kuma sends Usopp to. Episode 455 takes it to its logical conclusion by revealing that the entire island is in fact a ManEatingPlant, which periodically tips its petals into the air, sending any unfortunate creature not holding onto something into its gaping maw.
** Post-timeskip, [[spoiler:Usopp seems to have taken to using them as weapons.]]
* ManlyTears: Many and frequent, though Franky is especially prone to blubbering at the drop of a hat while [[SandInMyEyes fervently denying it.]]
* ManOfWealthAndTaste: Crocodile. Fullbody fancied himself one, early in the series.
** And from what we've seen so far, Donquixote Doflamingo.
* MarshmallowHell: Nami's greeting to Usopp after the time skip.
-->"You've... been doing some growing of your own, I see."
* MaskPower: Usopp[=/=]Sogeking after the Enies Lobby arc.
* MasterApprenticeChain: Luffy was inspired by Shanks, who apprenticed under Roger.
* MasterOfYourDomain: Life Return (''Seimei Kikan'').
* MeaningfulEcho: Queen Otohime always pinky swears with her children as a promise to make their future better. [[spoiler:When she was dying, her oldest son Fukaboshi promises her that they will collect all the signatures she had long fought for and they will protect Shirahoshi, to reassure her that the future will be better.]] They seal the promise with a pinky swear.
** Done again [[spoiler: when the Straw Hats leave Fishman Island, Shirahoshi pinky swears with them that not only will they meat again, but that she'll be stronger when they do.]]
** At his death, Roger proclaims that One Piece exists, sparking the Pirate Age. At his death, [[spoiler:Whitebeard]] proclaims that One Piece exists, sparking the New Age.
* MeaningfulFuneral: Just try not to cry when [[spoiler:they consign the ''Going Merry'' to the depths]], we dare you.
** Chapter 590: [[spoiler:Ace and Whitebeard's graves.]]
* MeaningfulName: Many names. Usopp is a combination of "Aesop" and the Japanese word "to lie"; the ''One Piece'' Blackbeard and Whitebeard are named Teach and Edward, respectively, after the real-life "Blackbeard" Edward Teach; a gangster-themed Supernova is named Capone; and Donquixote Doflamingo, a man who doesn't believe in dreams, is named after the most iconic dreamer in Western literature.
** Ironically, Doflamingo shares one trait with his namesake, namely the fact that neither realize that their beliefs are merely a product of their own insanity.
** Silvers Rayleigh has a triple meaningful - or even quadruple - name combined with FridgeBrilliance. For starters, silver is commonly held to be the second most valuable metal after gold, which is fitting as Rayleigh is Roger's second in command, and Roger is more well known by "Gold" Roger than his real name. The name 'Rayleigh' may be a reference to [[http://en.wikipedia.org/wiki/Lord_Rayleigh Lord Rayleigh]], a physicist who explained the phenomenon known as [[http://en.wikipedia.org/wiki/Rayleigh_scattering Rayleigh scattering]], an effect whereby light can be scattered by particles that are smaller in size than wavelength of light. Reference Rayleigh's fight with Kizaru, a ''light'' Logia. His name also sounds strikingly similar to [[http://en.wikipedia.org/wiki/Walter_Raleigh Sir Walter Raleigh]], who was a 16th century English explorer who ransacked a Spanish outpost. Also, there is the connection that Rayleigh's last name (Silvers) can also refer to Long John Silver, of the popular book regarding piracy of the nautical nature, Treasure Island. It could all just be a cosmic coincidence, but given Oda's [[ChekhovsArmory track]] [[ShownTheirWork record]]...
** Nami and Nojiko's foster mother was called Bellemere. ''Belle-mère'' means mother-in-law in French.
*** It can also mean stepmother, which is closer to being accurate in this case.
** The country Kuma sends Brooke too is referred to as Harahettania, the land of poverty. "Harahettania" just means "I'm-hungry-nia" in Japanese.
* MechanicalMonster: The Pacifistas, MadeOfDiamond and wielding firepower said to be the equivalent of a ''battleship''.
* MeaninglessVillainVictory: The entirety of the Marineford Arc turns out to be this. [[spoiler:The Marines win the battle, and Ace and Whitebeard are dead. But killing those two, which was supposed to act as a warning against the pirates of the world, only invigorated them further after Whitebeard declared that the One Piece does exist. That includes Luffy and the rest of the Straw Hat Pirates, who spend the next two years after the battle training and becoming stronger, becoming an even bigger thorn in the Wolrd Government's side. On top of that, the Marines lost several prisoners of Impel Down, including Blackbeard, who now has ''two'' Devil Fruit powers, including Whitebeard's Quake Quake Fruit power, and none of the self-control to go with it. Finally, a FridgeHorror that slowly sets in is that all of the Marines who died during the battle died for nothing, which causes several high-profile Marine higher-ups to quit out of disgust.]]
* MedalOfDishonor: Smoker is ''furious'' at the promotion given for Alabaster's salvation when it is the Straw Hat Pirates who were the country's saviors; his participation in it was negligible at best compared to even Tashigi. The Government was basically cornered at this point; either cover up the truth with this sham of a medal, or openly admit that ''Pirates'' saved a country from one of their own rogue privateers.
* MegaManning: [[spoiler:Blackbeard]].
* {{Meganekko}}: Tashigi. Robin occasionally wears glasses as well, although she qualifies more as a HotLibrarian.
* MegatonPunch: Kuma prominently, though Luffy's pulled it off a few times.
* MemeticBadass: Buggy is actually becoming an in-universe example.
* TheMenFirst: Played for comedy with T-Bone. Then played completely straight with Luffy, who goes through ridiculous lengths to protect his crew before his own well-being (Nami at Drum Island, [[spoiler:Mr. 2]] at Impel Down, etc.) and most recently Whitebeard, BadAss, FatherToHisMen extraordinaire.
* MercifulMinion: In the Arlong arc, Nami pretends to stab Usopp to save him from the fishmen.
* MetaOrigin: The Devil Fruit. Paramecia-type give you superpowers, Zoan-type [[{{Animorphism}} transforms you into an animal]], and Logia-type effectively give you [[ElementalPowers complete control over an element]]. These powers can be given to humans, animals, or even inanimate objects, and most recently "awakened" Zoan-type Devil Fruits have shown up. As have Ancient and Mythical Zoans, making what was previously seen as the least useful type seem quite a bit more worthwhile; X Drake's Ancient Zoan turns him into a T-Rex, while Marco the Phoenix's Mythical Zoan turns him into [[ExactlyWhatItSaysOnTheTin exactly what you'd expect]].
* MilesGloriosus: Usopp, of course. Though lately, he's gotten better at not running away at the first sign of danger.
* MilestoneCelebration: The Straw Hats finally get to the Grand Line in the 100th chapter of the manga. Oda had to severely truncate the Loguetown arc to make it so, however.
* MillionToOneChance: The reputed odds of someone possessing the Color of the Supreme King Haki. Though since 7 different characters have been confirmed to have it (Luffy, Boa Hancock, Shanks, Silvers Rayleigh, Whitebeard, Ace, and [[spoiler: Donquixote Doflamingo]]), you get the impression that it's not as rare as people say.
** Alternatively, it could be said those with this power find themselves at the epicenters of great events in history and it is fate that they meet up.
** However, it needs to be pointed out that this series has LoadsAndLoadsOfCharacters, and that's not even counting the virtually numberless masses comprising the various [[RedShirtArmy Red Shirt Armies]] and the civilian population. And as pointed out, the Marineford drew in nearly all of the most powerful characters in the series, so of course just about all of the characters with Overlord Haki are going to end up in the same place. In fact, it's a bit telling that an arc containing so many powerful characters introduced so few that actually have it.
* MindScrew: The Punk Hazard arc has been pretty much this so far, what with [[spoiler:the dragon, the talking samurai head/legs, the bird woman, and the nursery full of giant children]]. Obviously, these things will be touched upon later, but there's now doubting how weird it all is.
* MinorInjuryOverreaction: Pearl.
* MiserAdvisor: Nami pretty much always has money on her mind. Occasionally in her eyes as well.
* MisfitMobilizationMoment: The Straw Hats' Power Walk to Arlong's base of operations.
* MissedHimByThatMuch: An amusing scene where Luffy and Buggy are ''standing right next to each other'' and keep looking in exactly the wrong direction to actually see each other. They even have a brief conversation without realizing who they're talking to.
* MissingMom: Several characters are affected or motivated by the lack or loss of their mother. Nami, Usopp, Robin, and most recently Ace.
** Even more recently is Princess Shirahoshi.
* MistakenForBadass: Buggy the Clown received this treatment when [[spoiler:a bunch of Impel Down escapees heard that he was on Gold Roger's crew alongside Shanks, even though he was just an apprentice. Throughout the remainder of the Marineford Arc, the convicts believed everything Buggy did was badass, so much so that they eventually joined his crew]].
** This trope was used again [[spoiler: when the Impostor Straw Hats attempted to build a crew made of the strongest rookies they could find. Unfortunately, unlike Buggy, their secret is exposed and they lose their recruits. Guess Oda only wanted Buggy to be that lucky]].
* ModestyTowel: Used after Luffy defeated Crocodile while everyone is in their own gender baths. Gets averted when the guys are looking over at the girls and Nami decides to give them what she liked to call: Happiness... PUNCH! Made funnier by Vivi's horrified expression at Nami when she does this.
* MomentOfWeakness: When Luffy angrily tells Usopp in Water Seven that he can just get off their ship if he doesn't like how Luffy does things.
* MoneyFetish: Nami has this. [[MiserAdvisor She just can't have enough of it.]] She's even the current page picture !
** She's gotten better with time, though; now she almost never scams her own crewmates and considers them more important than money. For example, [[spoiler: when Usopp was robbed of a whopping 200 millon by the Frankies]] she seemed to not care about the money and said that the priority was that [[spoiler: Usopp was alright]].
* MonsterClown: In movie 10, Gold Lion Shiki employs one: Dr. Indigo. With his crazy face-paint, ridiculous looks, and fart-noise shoes, he makes for a good VillainousHarlequin. He starts heading towards this trope once he drops his silly behavior and begins to conjure ghostly fire from nowhere and sling it around.
* MonsterMash: Thriller Bark. It even has a nod to {{Thriller}} by MichaelJackson.
* MoodWhiplash: The Water Seven/[=CP9=] arc is the ''king'' of this trope.
** Right after the Straw Hats and Aokiji team up to save a group of stranded civilians (and the former celebrates, complete with cheerful music), Aokiji informs them that he has to kill them. And then proceeds to [[CurbStompBattle curb stomp]] everyone.
* {{Mooks}}: And how. The low-class soldiers will charge in by the hundreds, then get carted back out again a short time later on a single, massive stretcher, never once questioning why they should willingly get themselves beat up or what's so great about the World Government or Marines anyway. The best example of mooks since the stormtroopers.
* MoralityKitchenSink: The Straw Hats are morally ambiguous pirates that are motivated by self-interest and personal goals, but tend to do good anyway by defeating more evil pirates (or marines) that happened to [[ItsPersonal do something to offend them]]. Other pirates can be anything from ChaoticGood adventurers to SelfishEvil {{jerkass}}es. Likewise Marines can be anything from [[HeroAntagonist legitimate heroes]] to [[PunchClockVillain guys who just want a check]] to [[WellIntentionedExtremist well-meaning extremists]] to [[KnightTemplar Knight Templars]].
* MoreHeroThanThou: Sanji and Zoro pulled this crap on Thriller Bark, until the latter knocked the former unconscious.
* MrViceGuy: Despite Nami's greed and Usopp's cowardice, both are decent, even heroic characters underneath.
* MrFanservice:
** A large portion of the male cast fits into this trope: Luffy, Zoro, Ace, Smoker, and Trafalgar Law, to name a few.
** For the ladies who prefer their men older, we present to you Shanks.
** Sanji, who most recently became bait for a very [[WholesomeCrossdresser different]] sort of EstrogenBrigade, much to his dismay.
** Yorki: A drunken blonde cowboy pirate who loves singing and cute animals. ''Delicious.''
** After the timeskip, the whole Straw Hat male crew became this (except of course the unmistakably machinized Franky and the all-bones Brook). We have to mention Sanji's smart and small goatee, Zoro's mature atmosphere and manly scar, Usopp's whole new muscular build and much-much cooler style, and Luffy's scar and serious moments which tell that there is a lot more in him than he usually looks. Even Chopper evolved from the "just cute" part to become a multitude of baits with his differently looking forms for the furry-loving part of the Estrogen Brigade...
* MsFanservice: Quite a few, but Nami and Robin in particular.
** There's also Hancock, Ms. Doublefinger, Porche, Kalifa, and Marguerite.
* MuggingTheMonster: Most of the Jaya arc has this in some form or another, with Bellamy and his crew being the muggers. The first time, Luffy and Zoro just shrug off their insults, despite either being able to beat the entire crew single-handed. Then Bellamy goes and [[BerserkButton robs Luffy's new friends]]. [[CurbStompBattle Big mistake.]] Later on, Sarquiss, Bellamy's first mate, accidentally bumps into Blackbeard and starts mouthing off. Blackbeard gives him a nice taste of the wooden dock for his trouble.
** [[spoiler:Immediately after the time skip, a random pirate crew posing as the Straw Hats come across the genuine Nami and Usopp, who give the imposters a small taste [[TookALevelInBadAss of what they've been learning over the past two years]]. Then the same fakes have the misfortune of threatening the real Luffy. Luffy nonchalantly [[DodgeTheBullet dodges a bullet]] to the head from Fake Luffy's pistol (never mind that, since he's all but immune to blunt force, it'd probably bruise him at the most) and knocks out all of the Fake Straw Hats present with Haki.]]
** In the Dressrosa arc, Spartan, a star at the colosseum, is insulted that "Lucy", a seemingly old frail man, is participating in the tournament and attacked him, only to the easily defeated by the disguised Luffy.
* MultiArmedAndDangerous: Hatchan, Nico Robin, Omigumo, and Zoro when using his mysterious 9-sword style.
** Also one of Whitebeard's allies, who has an octopus theme and six fully functional arms. Whether he's a fishman hybrid or a fruit user is yet to be seen.
* MultipleDemographicAppeal: Adult female readers compose one of the manga's largest audiences.
* MultipleHeadCase: Judge Baskerville. [[spoiler: Turns out he's actually two shorter guys sitting on the legs of one really tall guy in the middle.]]
* MultipleReferencePun: Sanji's parage shot and Nami's hometown Cocayashi Village (See entry on that page for details).
* MundaneMadeAwesome: Sanji makes cooking look epic.
* MusclesAreMeaningless: A bit of a rule; many of the men in One Piece are very ripped, but generally speaking, having visible muscles or imposing size doesn't ''necessarily'' translate into strength. Luffy and Sanji, for example, are both in very good shape, but not grossly muscular; yet they are stronger than men who tend to be [[OurGiantsAreDifferent literally twice their size]]. And of course, Luffy and his brother Ace were punching out grown men and wild animals at the tender ages of 7 and 10, respectively. And on the opposite side, after the TimeSkip, we have the formerly stick-skinny Usopp who is now even more muscular than Luffy... but still possesses average human strength.
** And as for the super strong women, not too many of them are ''muscular'', but rather simply [[StatuesqueStunner bigger]]. There are exceptions even to this though; the government assassin Kalifa is a moderately sized woman, yet can kick holes in through a stone wall.
* MusicalAssassin: Scratchmen Apoo. (His own body is the instrument.)
* MyDeathIsJustTheBeginning: The whole point of the show. The adventures were launched when Gold Roger announced the existence of One Piece at his execution.
* MyFavoriteShirt: Luffy's hat is his greatest personal treasure, and perhaps the only of his possessions that would put him into an UnstoppableRage if lost or damaged.
* MyGreatestFailure: Luffy has two: [[spoiler: the defeat of his crew that scattered them over the oceans]] and [[spoiler: being unable to save Ace.]]
** Jinbe is also haunted by [[spoiler: Ace's death]] and the fact that he indirectly let [[spoiler: Arlong terrorize East Blue and contributed to Nami's tragic past.]]
* [[MyNameIsInigoMontoya My Name is Monkey D. Luffy.]] You took my TrueCompanions. Prepare to get your ass kicked.
* MySuitIsAlsoSuper: Clothes stretch, grow, shrink, regenerate, and transform along with the wearer, with a few exceptions. No HandWave is attempted in-series, but Oda [[WordOfGod admits in his Q&A column]] that if Devil Fruit powers were portrayed more realistically, his manga would have a lot of unnecessary nudity.
* MysteriousParent: [[spoiler:Dragon]]
* MythArc: The past history of the world and the crimes of the World Government, as well as the long term plans of several villains.
* MythologyGag: The panel where [[spoiler:Zoro decapitates a dragon]] is almost identical to the one where [[spoiler: Ryuma did the same]] in ''One Piece Wanted.''
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