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Examples of SamusIsAGirl in anime and manga.

* The ''Anime/HaloLegends'' anthology does this a couple of times with the [=Spartan-IIs=], due to them being 7-foot-tall {{Super Soldier}}s clad head-to-toe in PoweredArmor:
** "The Babysitter" uses this trope for Spartan-II sniper Cal-141, since she doesn't even ''speak'' for most of the short.
** Done again in "Homecoming", where Spartan-II Daisy-023, after saving a platoon from a Covenant ambush, is revealed to be a girl when she removes her helmet. [[ The helmet even kind of looks like Samus's.]]
* Marlene in ''Anime/BlueGender''. Yuji is her "Bob."
** He's more surprised by the fact that she's human than the fact that she's female. Waking up in the middle of a BugWar and seeing nothing but NightmareFuel for a solid 5 minutes can do that to you.
* ''Manga/JoJosBizarreAdventure'':
** In Part 2, ''[[Manga/JojosBizarreAdventureBattleTendency Battle Tendency]]'', Joseph Joestar and Caesar go to meet Caesar's mentor. When Joseph finally meets her, she is initially fully dressed and her face is concealed, and he thinks she must be a man... until she reveals her face.
** In Part 7, ''[[Manga/JojosBizarreAdventureSteelBallRun Steel Ball Run]]'', Hot Pants was initially assumed to be a guy, and drawn with masculine features like broad shoulders and square chin. We find out she's a woman at the end of her introductory arc. From that point on, she began to be drawn in a more feminine style.
** In Part 8, ''[[Manga/JojosBizarreAdventureJoJolion JoJolion]]'', Josuke is attacked by Going Underground/Born This Way, a Stand that looks like a man riding a motorcycle. Turns out the user is Kyou Nijimura, the Higashikata family maid.
* Rei in the manga version of ''Anime/NeonGenesisEvangelion'' when she's still inside the Eva. [[FogOfWar In the confusion of the battle]], Shinji can't tell if anyone ''is'' inside the Eva (Rei's name comes up, but that seems to be a thought bubble rather than spoken dialogue on Misato's part). Shinji cries out (in the English translation), "Our guy's getting clobbered!" But when he gets to NERV headquarters, he still seems to think he was saved by a robot. At any rate, as soon as the reader -- and, a few panels later, Shinji -- actually ''[[TheReveal sees]]'' Rei, it's clear she's a BandageBabe -- along with all sorts of other types of {{fanservice}} / FanDisservice.
** Carefully averted in ''Anime/RebuildOfEvangelion 2.0'' with Asuka, who arrives in Unit 02 to fight the Angel. Shinji had never seen her or her Eva before but when he does comment on the battle, he doesn't use any third-person pronouns in either the Japanese original or the English dub.
* In ''{{Manga/Berserk}}'' Guts doesn't realize that Casca who is in full medieval knight armor is woman until he knocks off her helmet.
** Later at a formal celebration Guts is approached Casca now dressed in, well, a dress, despite knowing very well that she's a woman, Guts is awfully surprised to see her looking like one, likely used to her being one of the guys.
** Even later when the Hawks plan to rescue Griffith their guide is none other then Princess Charlotte who admits not realizing that she was a woman the first time they meet (much to Guts and Judeau's amusement).
** The “Flower Storm Monarch” of Elfhelm (Puck’s home) turns out to be a female elf called Danan. This was surprisingly for a good few readers as the Dark Horse translation was “Flower Storm King” though in the raw Japanese kanji Danan’s title roughly translates to “sovereign“ which is gender neutral allowing for the reveal.
* When most people hear of the assassin ''Anime/{{Noir}}'', they assume it to the be the codename for a ''male'' assassin, as opposed to the fact that it is actually ''two'' girls.
** Especially ironic, since eventually it's revealed that Noir in fact originally referred to two female killers as long as thousand years ago.
* In the ''Manga/GiantRobo'' [[OriginalVideoAnimation OVAs]], ActionGirl[=/=]CoolBigSis Ginrei first appears in disguise as a [[CoolMask masked]] BadassLongcoat to rescue Dr. Shizuma -- for all of a minute, before [[FlungClothing suddenly changing]] into her trademark Chinese dress, and never using the "Iron Mask" disguise for the rest of the series.
* Cagalli Yula Athha of ''[[Anime/MobileSuitGundamSeed Gundam SEED]]'''s [[{{Tomboy}} tomboyish personality]] and androgynous clothing originally fools both Kira and Athrun into thinking she is a boy. Her gender confusion is also an in-joke to the viewers, as her voice actress Creator/NaomiShindo usually voices young boys.
* ''Manga/RanmaOneHalf'':
** Ranma's UnluckyChildhoodFriend Ukyō is the series foremost example. Having met her at a very young age, Ranma always believed her to be another boy; after a bitter grudge match in which she forces him to fight "seriously," he is stunned to discover she is actually a girl. HilarityEnsues:
---> '''Ranma:''' Since when are you...\\
'''Ukyō:''' ...a girl? Since I was born, idiot.\\
''[Ranma pours hot water on her]''\\
'''Ukyō:''' Ow! Hot! Hot! Hot! ''[punches Ranma]'' Why the hell did you do that, ya jackass?!\\
'''Ranma:''' Hey, you didn't turn back into a guy.\\
'''Ukyō:''' Now you listen, and you listen ''good'': I am one hundred... [[PunctuatedForEmphasis per-cent]]... woman!
** Exemplified and subverted ''again'' by the character Herb. When the tall, dark, powerful stranger who handily defeats is shown to be a woman, the cast reacts with surprise and shock. However, the subversion comes as it turns out that Herb is the ''Prince'' of the Musk Dynasty, who, having fallen into the same cursed spring as Ranma, also turns into a woman.
** This is then inverted by [[DudeLooksLikeALady Konatsu]] and [[MasterOfDisguise Tsubasa]], [[WholesomeCrossdresser Ukyou's]] would-be suitors who ''everyone'' (including the audience) believed to be girls, right up until the very final page of their introductory story arcs -- when [[ClothingDamage their outfits]] are destroyed, one way or another.
* In ''Manga/{{Bleach}}'', (read only if you've seen Episode 41 or read Chapter 116) Yoruichi is a more long and drawn out version of this; as long as she remains in cat form, everyone assumes she's a man. In the manga, this was just an assumption on the part of the reader. The anime is more deceptive; they gave cat-Yoruichi a really masculine-sounding voice. It doesn't help that she has the speech patterns of an old man. Cat-Yoruichi is supposed to sound masculine; in the manga, she tells Ichigo that most people who only know her as a cat think she's male because of her voice. HilarityEnsues when she reveals that she is a girl.
* In the anime ''Manga/{{Bastard}}'' Arshes Nei was shown at first as a figure in full plate and rather bulky armor, which made impossible to tell that the character within that armor was, in fact, a slender female.
* Mukuro from ''Manga/YuYuHakusho''. She even disguises her voice and covers her face when she is first introduced. She also refers to herself with the ''very'' masculine pronoun "ore" in Japanese, and, believe it or not, Hiei is her Bob.
* One episode of ''Anime/ExcelSaga'' concerns a mysterious masked man with a masculine voice. He and Nabeshin have a lot of HoYay, which Excel comments on -- and then the mask is removed, showing a beautiful blond woman. [[RuleOfFunny Still with a masculine voice.]]
* A bit of a drawn-out occurrence appears in ''Manga/KatekyoHitmanReborn''. It is pretty much impossible to tell I-pin's gender, since she is a baby... Then she gets hit with the 10-year Bazooka. No romance (again, baby) but she ''does'' spend a lot of time with Lambo.
* Haruka in ''Anime/SailorMoon'', although there's no romance arc beyond her flirting with Usagi for the fun of it; she's already taken... by a woman, which helped hide her gender. Though due the fact that she appeared in the anime in her Senshi form before the reveal at the end of the episode introducing her, viewers are not as shocked as the characters. (It should be noted that before this episode, Uranus and Neptune DID show up in senshi form, but all the viewer was shown was a silhouette and the credits only listed them as "Mysterious Senshi 1 and 2". Also, for the first few Uranus and Neptune appearances in the original [[Manga/SailorMoon manga]], they were perceived not as two mysterious senshi, but as a mysterious senshi/Tuxedo Mask pair; and Haruka's flirting with Usagi was much heavier. It wasn't until after they joined with the other senshi that Uranus was perceived as a woman rather than a man.
* ''Manga/FullmetalAlchemist'':
** When Ed uses alchemy to destroy Lan Fan's mask in their fight, he's so shocked to see she's a girl that she's able to both destroy his automail arm and drop a bomb before he can react. Subverted the subtrope by not becoming Ed's love interest at all. In fact, she [[BodyguardCrush already has her own]] (there was a brief, mostly-played-for-laughs ShipTease between Lan Fan's love interest and Ed's, though).
** Major General Olivier Mira Armstrong. When Alex first mentions her she could have been a male as well, especially because her first name ''is'' [[GenderBlenderName a male name]]. Also, the "preview" image of her for the next chapter/episode in both the manga and anime is [[ ambiguous]].
* Yellow in ''Manga/PokemonAdventures''. Funnily enough, by the time of the reveal the only ones shocked by it are Red, Crystal, and later Gold. Red actually met her prior to formally meeting her however it's unknown if he ever finds out the girl he rescued was Yellow.
* ''Anime/{{Pokemon}}'':
** Kidd Summers at the start of ''Anime/PokemonLucarioAndTheMysteryOfMew'', literally in armor. Semi-justified by the fact that ''everyone'' at the festival is in quasi-medieval costume.
** Anabel and Angie are both tomboys who Ash mistook for boys. Incidentally, they both end up developing a crush on Ash.
** Zoroark turns out to be female in the movie.
** [[TheOnlyOneAllowedToDefeatYou Georgia's]] Pawniard/Bisharp, despite being voiced by a man, is revealed to be female in her debut episode.
** This happened to Jessie twice. She thought her Yanmega and Pumpkaboo were both male.
* Due to the voice acting in the dub, German viewers often thought ''Anime/DigimonTamers'''s Renamon was supposed to be "male" (or at least gender-neutral -- it's a somewhat deliberately enigmatic digital lifeform in what's arguably a kids' show, after all). Which makes the final form a bit of a surprise.
** Plenty of people were caught off guard when Cutemon in ''Anime/DigimonXrosWars'' yelled that he was a boy around the middle of the series. Twisted even further in the dub -- he's voiced by a male and ''still'' sounds adorable!
* Parodied in ''SteelFistRiku''. Chikara Toudou arrives to challenge Riku's father, but since he's not around, he decides to challenge the "son", Riku, instead. At this point, Riku has her chest bound flat, so it's understandable. But then, Riku tells him she's a girl, and he accuses her of pretending to try and get out of the fight. Then, during the fight, he notices the bump under Riku's shirt... and thinks "he" is concealing a weapon there. He finally gets it after he grabs her breast.
* Odd variation in ''Manga/MahouSenseiNegima'': Earlier in the manga we met Paio Zi, a member of a group of bounty hunters pursuing Nodoka had a rather... "healthy" appreciation for [[strike:breasts]] boobies that bordered on the obsessive. Most readers found this character ''quite'' [[DudeNotFunny disturbing]]... until a recent chapter mostly [[FuroScene set in a bathhouse]], where the hunters are encountered again under peaceful circumstances, and Paio is revealed to be a girl, who proceeds to SkinshipGrope the hell out of pretty much everybody within reach (and she moves ''fast''), to the amusement of the fans. This comes across as a bit of a DoubleStandard, but she's really a lot less threatening without her fighting costume, which is rather monstrous and effectively ''quadruples'' (at least!) her body mass. Compare her [[!/218/06/ in costume]] (Commanding the tentacled worm) with her [[!/235/07/ out of it]] (Furo, remember? so may not be Work Safe).
* EnigmaticMinion Masquerade of ''Manga/{{Bakugan}}'' is actually [[spoiler:Alice]]. She uses her StatOVision {{Sinister|Shades}} {{Mask|Power}} to transform.
* Noi of ''Manga/{{Dorohedoro}}'' does this in the first volume. She's one of the numerous masked badasses of the show; taller, bulkier and probably stronger than the entire male cast.
* Stir from ''Manga/KingOfBanditJing'' does this. She shows up in a full-plate armor to participate a gladiator duel. Everyone assumes she's a guy (as all the other participants were males), and were extremely surprised when her mask broke.
* In ''[[Anime/RevolutionaryGirlUtena Adolescence of Utena]]'', Saionji cuts Utena's shirt in their duel, leading to the following exchange:
-->'''Saionji:''' You're a girl?\\
'''Utena:''' [[YouNeverAsked I don't remember saying I was a boy!]]
* In the ''[[VideoGame/DragonQuest Dragon Warrior]]'' anime, [[ActionGirl Daisy]] saves [[TheHero Abel's]] hide a few times before he finds out she is a girl.
* ''Manga/FistOfTheNorthStar'':
** has this pulled off by the Last General of Nanto, who dresses like a fearsome warlord. Once the helmet comes off though, the General is revealed to be none other than Yuria, who was presumed dead at the time.
** A [[EstablishingCharacterMoment badass]] inversion was used in Rei's debut. You see a woman in a pink cloak being harassed by thugs. You think a badass martial artist will jump in and save the day. But the "woman" in the pink cloak turns out to be martial arts badass Rei in disguise, luring the thugs to him.
* Happens twice in the Manga/GetterRobo series:
** In Getter Robo Armageddon ,at the beginning of the series the kid is daughter of Dr.Saotome initially using boy's clothing. After missile fall to Earth events, Genki Saotome is adopted by Benkei and revealed that he is a girl and having her name changed to Kei Kuruma.
** Raikou Minamoto in New Getter Robo, who is revealed to be a woman only after Ryoma tackles her and [[AccidentalPervert ends up grabbing a handful]].
* Reversed in ''Manga/LiarGame'' in the second round where the seemingly innocent "Yuji" is revealed to be the cross dressing Mr. X.
* ''Manga/OuranHighSchoolHostClub'': Haruhi, if you watch the first episode [[ItWasHisSled unspoiled]], which is pretty much impossible nowadays.
* ''Anime/GlassFleet'' combined this with ViewerGenderConfusion because Michel had a female voice actor. The big reveal isn't until episode seven. Afterwards, her style of dress does not change.
* ''Anime/YuGiOhGX'': Rei initially disguised herself as a boy, but during her introductory episode, she turns out to be a girl. She pulls this off again during her second appearance, but later embraces her feminity (sort of) when she enters Duel Academia for real.
* In ''Anime/YuGiOh5Ds'', the helmeted D-Wheeler shown in the third intro sequence turns out to be a blond woman named Sherry. (Yusei doesn't ''truly'' realize she's a woman until the end of the first part of the two-part episode, but even before then, the cards she uses gives him and the viewers a clue that his opponent is a woman; mostly female monsters with a LadyOfWar theme, like Sherry herself, and flower-themed Trap Cards.)
* ''Anime/YuGiOhArcV'': While not revealed in-universe, the OCG released human versions of the Four Heavenly Dragons, revealing the fact that Clear Wing Synchro Dragon is actually female.
** Reira Akaba. The Japanese version has characters refer to them with gender-neutral pronouns, and the character wears a hoodie and hat to cover her hair, making her look like a boy. The dub refers to her as male, but gives her a gender-neutral name, ''Riley.'' Both fans and characters assumed Reira to be a boy, until TheReveal later on, when she takes off her hat and hoodie, revealing her long hair and feminine appearance.
* ''LightNovel/KinosJourney'': [[AmbiguousGender Kino]] is a girl. The anime doesn't tell you until the fourth episode and you don't find out for quite a while in the non-English novels, before which most viewers tend to either assume she's a boy or think "But he could be...". The people who figured it out before hand got to give themselves a good pat on the back when her gender was finally revealed.]] Strangely, it is Japan in which this is easy to guess due to seemingly CrossdressingVoices, the English dub gives the character a much more ambiguous voice. Though it's not uncommon in anime for adolescent males to have distinctly effeminate voice.
* ''Lightnovel/FullMetalPanic'': In the Second Raid, Mithril agent Wraith is revealed to be a woman. She disguised herself as an overweight man complete with a voice changer.
* With Hinagiku taking the role of Silver Red (a superhero of a Sentai parody), ''Manga/HayateTheCombatButler'' is setting itself up for this one. The other characters even think Red ''is'' a guy, despite the significant lack of male form ([[ACupAngst not just Hina's]] UsefulNotes/{{Pettanko}} status).
* In ''Anime/KirbyRightBackAtYa'', Princess Rona initially introduces herself as the MALE bodyguard Vee to the decoy princess because she wanted to get to know the people of Cappytown as a normal person. It's not until her helmet falls off later on that any real girlishness is revealed. She still manages to kick Dedede's ass at the end in a swordfight even after being revealed as the actual princess. Though in this case, the deception was intentional, not just that wearing that particular suit or whatever was the most logical thing to do for an action hero.
%%* Busujima from ''Manga/BusouRenkin''.
%%* A 1987 anime version of ''Anime/TheThreeMusketeers'' does this to [[GenderFlip Aramis]].
* In ''Manga/DeathNote'', Misa Amane is revealed to the readers to be the second Kira soon after her activities become known to the other characters. In the English versions at least, Light and the investigators continue to refer to The Second Kira by the male pronoun (probably for the sake of convenience, as they use "he" when referring to the first Kira too) until they learn more about her.
* Played with in ''Anime/SpacePirateMito''. During a fight, BigBad Ranban's helmet is knocked off, revealing not only a female face underneath, but the same face as Aoi's mother, the titular Mito. Ranban reveals that it's just a [[PoweredArmor mail suit]], which Mito also wears, modeled on the first queen of the galaxy. Later on, however, it's revealed that Ranban never differentiated between genders, as his species usually does at puberty, and is thus a {{hermaphrodite}}.
* In ''Manga/OnePiece'' Movie 4, the little kid whom Luffy and Co. encountered was revealed to be a girl dressed in boy's clothing near the end.
* Sevotharte from ''Manga/AngelSanctuary''. The promising scientist Lailah's success elicited jealousy from her male peers, who [[RapeAsDrama raped her]]. Branded a Fallen Angel for becoming "tainted," she sold herself in desperation to [[FetusTerrible Sandalphon]], who whitened her hair and altered her face and body type. Since the true Sevothtarte died years ago in combat, she took his name and wore a tiara and veil to hide her identity after she ascended into the Seraph rank.
* ''Manga/{{Naruto}}'':
** Used during the Land of Birds filler arc. An armored, flying specter wielding a naginata appeared to haunt a daimyo's castle which had recently seen great misfortune; the specter seemed intent on uncovering if an assassin had slain the former daimyo and his daughter. It was eventually revealed that the specter was [[spoiler: Toki, the supposedly deceased daughter; after her twin brother Sagi and their father were poisoned, she disguised herself as Sagi in order to assume the lordship and discover the killer's identity]].
** Subverted much earlier during the Land of Waves of arc. Haku's first appearance showed [[DudeLooksLikeALady her]] to be highly-skilled and convinced even Kakashi that [[WholesomeCrossdresser she]] was a threat while wearing bulky robes that could disguise a feminine form. A chance meeting with Naruto while in civvies set up the possibility of a forbidden romance... and then Haku had an UnsettlingGenderReveal.
* In ''LightNovel/{{Durarara}}'', Celty's gender isn't clear when she first appears thanks to camera angles and lighting, although her feminine form is much more apparent later on. It's apparently less obvious in-universe than it is to the viewers; neither Shizuo nor Tom knew that Celty was female until Shinra told them.
%%* Melk the Second from Toriko starts off appearing to be a very [[{{Bishonen}} bishie man]].
* ''Manga/IceRevolution'': Most of Masaka's friends at the skating rink thought she was a boy... until she took the ice for her first performance. Heck, her own coach didn't even notice she was a girl until she told him.
* Kei in ''Anime/IriaZeiramTheAnimation''. She's pre-adolescent, so there's no way to distinguish that she's a girl dressed in boy's clothes until late in the series when Fujikuro literally sniffed out her gender.
* ''Manga/BlueExorcist'': In episode 12 Yamada, who always wore a hood and never spoke, turns out to be Stripperific ActionGirl named Shura, wearing a disguise to spy on our main characters.
** In the 20th anime episode, the villain working with Neuhaus turns out to be his wife, despite having used a distinctly male voice up until TheReveal.
* The titular character in Creator/OsamuTezuka's ''Manga/{{Dororo}}''. It doesn't help that she was told she was boy by her parents.
* In ''Manga/SgtFrog'', many characters first think that Private Tamama is a female due to his cute appearance and voice. Later on in the series, Tamama himself, along with most of the rest of the cast, falls victim to this trope when a Keronian named Karara comes to Earth to see the Keroro Platoon (known as the "ARMPIT" Platoon in Funimation's dub [[note]]which is either a {{Woolseyism}}, a GagDub, or a {{Macekre}} depending on who's asked[[/note]]). It's not made apparent that she's female until she leaves a goodbye note when she leaves at the end of the episode, saying that Tamama left such a huge impression on her that she wants to marry him when she grows up. In all the character's defense, an actual female Keronian hadn't shown up before then.
* Brilliantly pulled in ''LightNovel/InfiniteStratos''. Ichika accomplishes the impossible and moves an IS, something that's said to be impossible to be done by males. He gets himself enrolled in an all-girl school... then after a while, another male by the name of [[{{Bishonen}} Charles Dunois]] is transferred into the class and said to have accomplished the same feat. He is awfully shy around Ichika in the locker room and [[spoiler:refuses to change with him, something Ichika finds quite strange and tries to lightheartedly force the issue, only to provoke the other boy into running away. When he returns to their mutual room, [[ShowerOfAwkward Dunois is in the shower and Ichika enters the bathroom just as the former was about to leave the cubicle]]]]. Yup, [[SweetPollyOliver Dunois]] is [[FullFrontalAssault definitely not a guy]]. "He" later explains that [[spoiler:as an illegitimate child, she was kept in secrecy until a few years ago when she was tested and found to have a good aptitude at using an IS. Her [[WholesomeCrossdresser disguise]] as a boy served two reasons: first, as a publicity stunt to her father's company which was falling behind in IS development and second, as a way to [[TheMole get close to Ichika and spy on him]]]]. A few days later, Ichika's class receives another transfer student. Everyone, say hello to [[{{Moe}} Charlotte Dunois]]. Naturally, everyone in the class knows Charlotte and Ichika used the bathhouse together the previous night and instantly make the assumption he must've known and [[AccidentalPervert took advantage of it]]. Cue [[{{Yandere}} Rin]] [[PervertRevengeMode bursting into the classroom with her IS and firing a full-powered shot at Ichika's head]].
** And as a little extra, Charles/Charlotte also happens to be a CharClone and later becomes a {{Love Interest|s}} for Ichika.
*** And as a little extra extra, her nickname, given to her by Ichika, IS Char. Go figure.
* ''Manga/FushigiYuugi'' has Soi, who was a person wearing a cloak for a few chapters before revealing herself as a woman.
* A villainous example appeared in ''Anime/BrainPowerd'' -- the enigmatic Baron who begins to appear late in the show is quite fearsome, helping the villain Jonathan transform his [[HumongousMecha Grand]] [[EmpathicWeapon Cher]] into a borderline EldritchAbomination known as the "Baronz." His reasons seem mysterious and ChessMaster-y, but... [[spoiler: behind the mask, it's actually Jonathan's estranged mother, trying to protect and help her son despite being stuck on the wrong side of the conflict from him.]]
* Inverted in ''LightNovel/{{Baccano}}'', where Claire Stanfield, the expert assassin named Luck had hired, turns out not to be the [[RedHerring fatigues-wearing]] ActionSurvivor woman [[RedHerring that'd been making her way across the train]], but rather [[spoiler:[[RedHerringShirt the redheaded conductor that was supposedly killed off very early on in the story.]]]]
* The acolytes in ''Anime/AgnisPhilosophy'' are all presented to the viewer as robed, hooded individuals, so the viewer can be forgiven for [[MenAreGenericWomenAreSpecial assuming they are male]] until the titular character pulls off her hood, revealing that "he" is, in fact, a she.
* In ''LightNovel/ACertainMagicalIndex'', the villainous organization GREMLIN, which is mostly made up of people with Myth/NorseMythology gimmicks, is led by someone called Odin. Surprise, [[spoiler: Odin is Othinus, who ''looks'' like a 13-14 year old girl and is still powerful enough to CurbStompBattle pretty much anyone since she indeed has the power of the Norse God Odin]].
* In ''LightNovel/MaoyuuMaouYuusha'', [[NoNameGiven The Hero]] was greatly surprised to find that The Demon King is [[SheIsTheKing a really cute girl]].
* In the original series plan for ''Anime/ScienceNinjaTeamGatchaman'', Berg Katse would have turned out to be a woman disguised as a man. About halfway through, [[GenderBender the producers changed their minds]]...
* ''Anime/IrresponsibleCaptainTylor''. Harumi takes off her helmet and baggy spacesuit to reveal she's a HospitalHottie, causing Dr. Kitaguchi to lose a SideBet that their latest crewmember would not be a woman.
* ''Anime/LupinIIIPrincessOfTheBreeze'' has Lupin fighting a Sky Pirate in a bird-beak mask. When Lupin pushes on the pirate's chest to keep them away from him, the pirate is upset. It turns out ''she'' is a young girl. Cue weaponized ArmorPiercingSlap, and Lupin getting knocked off of the airship.
* In the ''Anime/{{Gaiking}}'' CGI test footage, the pilot was revealed to be a woman. In its previous incarnations, Gaiking's pilots were both male.
* ''LightNovel/{{Shimoneta}}'' inverts it with Oboro, who [[AloofDarkhairedGirl looks]] ''[[CrossdressingVoices and sounds]]'' so feminine, that no one realizes he's actually [[DudeLooksLikeALady a male.]] At least, not until the locker-room scene [[CrotchGrabSexCheck between him and Tanukichi]] in episode 9. When Tanukichi tries to tell Ayame about it, she finds it so hard to believe that she [[CassandraTruth dismisses it]] as a weak excuse for his failure to catch the underwear thieves.
* ''Manga/TokyoGhoul'' and its SpinOff[=s=] use this trope, primarily in regards to their {{Big Bad}}s.
** In the main series, the mysterious, [[HeroKiller legendary]] and [[TheDreaded greatly-feared]] [[HalfHumanHybrid One-Eyed]] [[OminousOwl Owl]]/[[EvilOverlord King]] is revealed to be a young woman. People just ''assume'' the King/Owl is a man, as the loose cloak and massive [[InstantArmor Kakuja]] armor she wears completely concealed her form, making it easy for [[spoiler:her own father [[BigGood Yoshimura]] to impersonate her more than once]]. [[TheDogWasTheMastermind In a further twist]], [[EvilAllAlong said woman is]] [[spoiler:Eto, the childlike supposed-henchman who uses her male persona to be a KingIncognito, ''and'' Sen Takatsuki, [[TheHero Kaneki’s]] favorite author who he personally met at a book signing]].
** Lantern, the SerialKiller Ghoul from the {{Prequel}} ''Jack''. Wearing a Jack-o-lantern mask and a large trench coat, she takes full advantage of people assuming that Lantern is a man. Once again, it turns out to be [[TheMole someone the characters knew]]- [[spoiler:Uruka Minami, who inserted herself into Arima’s investigation on her]].
** The [[NoNameGiven unnamed]] leader of the Skull Gang in the ''Joker'' One-Shot. Known as a deadly and vicious Ghoul terrorizing the 13th Ward, the fact that she turns out to be a pretty teenage girl [[spoiler:who Juuzou saved from a [[TheChikan train molester]]]] takes Hanbee completely by surprise.
* ''Manga/DetectiveConan'':
** Natsuki Koshimizu is a quiet and short-haired young woman, who is believed by some of her fellow {{amateur Sleuth}}s (and the audience) to be a boy. Then [[GenderReveal she shows up]] [[SheCleansUpNicely wearing a]] SailorFuku...
-->'''Conan''': "... So he is a she?!"
** This trope makes a return with the character Masumi Sera. In her first appearance she at first appeared to be a rival love interest for Ran's affection, with the cast only discovering she's a woman when she starts school. This becomes a recurring theme, with characters constantly mistaking her for a male on their first meeting [[spoiler:including Kaito Kid, [[MuggedForDisguise who tapes her up and disguises himself as her]]]]. This leads to a rather comedic scene at the end of the case when Conan reveals this [[spoiler:just in time for Sera to break free and re-enter in her underwear]]. To be fair though, she ''did'' use her masculine appearance to get into the men's restroom because there was a large line for the women's, so the confusion is understandable.
* In the second season of ''LightNovel/SwordArtOnline'', Yuuki's [[note]]known at this point as [[RedBaron Zekken]][[/note]] badassery is established when she defeats [[InvincibleHero Kirito]] in a duel. The only reason the audience doesn't know she's a girl, however, is because the duel takes place offscreen, and we only see it as a combination of :[[TheBlacksmith Liz]] relating the story to [[LadyOfWar Asuna]], who wasn't present at the fight, the fact that Liz forgot to mention her gender, and Asuna's imagining of the scene (presented as a kind of pseudo-flashback), where she pictures Zekken to be some badass dude in bulky black armor. Hilariously, upon finding out, Asuna suspects Kirito lost because the reveal distracted him, but in a later montage, it shows that she ''still'' defeats him, mainly because of [[spoiler:her AIDS]], which for the past three years has forced her to live full time in the virtual world [[spoiler:while her real body undergoes treatment]]. As a result, she has a whole year more virtual life than Kirito, and he went so far as to say that if she was in SAO, ''she'' would have gotten the DualWielding skill, not him.
** In ''Progressive'', Liten is introduced as a heavily armored "tank" player with a helmet that conceals the face, and is initially not referred to with gender-specific pronouns in the illustrated page introducing Kirito and Asuna's party for taking on the boss of the fifth floor. Much to Kirito's surprise, Liten is revealed to be a girl after she takes off her helmet.
* During the Neo TV arc in ''Manga/TriageX'', the terrorist leader Wild Hunt is later revealed to be a woman named Siren who can change her voice by manipulating her throat.
* ''Manga/YuushaGojoKumiaiKouryuugataKeijiban'' takes place on an interdimensional message board for "heroes" of all types, with new users given the generic handle "Hero." Many chapters feature a hero whose gender isn't revealed for several pages, including a Japanese schoolgirl summoned into another world and saddled with a divided party, Wandering Sword who wants to get closer to catgirls, and a knight burdened with a womanizing holy sword that transforms into a handsome man.
* In ''Manga/{{Eyeshield 21}}'' there's Karin Koizumi, the quarterback of the Teikoku Alexanders. What makes her remarkable is that not only is she a female playing American Football, she's the quarterback of Japan's ''best high school football team''.
* ''LightNovel/{{Campione}}'':
** Lancelot of the Lake used magic to have a deep voice and appear to be a man when she has her armor and helmet on.
** Annie Carlton took on the masked and costumed persona of John Pluto Smith.
* Villainous example: for most of ''Manga/DeadmanWonderland'' Ganta assumes that the "[[InSeriesNickname Red Man]]" who killed his classmates was a man. She's not. [[spoiler:In fact, she is Shiro, his close ForgottenChildhoodFriend and a teenage girl at that.]]
* In ''Manga/MyHeroAcademia'', the seventh wielder of One for All and the master of All Might was only known as "Shimura" (her last name) for a while. About 40 chapters later, her full name was revealed as "Shimura [[SevenIsNana Nana]]," then the next chapter features her in a flashback. Since All Might is the living embodiment of RatedMForManly, his teacher and predecessor turning out to be a woman is pretty surprising.
* In the manga adaptation of ''VideoGame/MegaMan6'', Centaur Man is revealed to actually be a woman who disguises as a male and has a crush on Knightman. It doesn't carry over into any other adaptations, but many fans will still argue that it's canon.
* Non-human example in ''Anime/{{Beyblade}}''. Despite what the dub says, most of the Bit-Beasts [[AmbiguousGender have no known gender]]. Tala's Wolborg fell under this category until his battle with Kenny during ''G-Revolution''. When Tala [[SignatureMove employs his]] [[AnIcePerson Novae Rog]] [[FinishingMove to end the match]], [[ a beautiful ice maiden is briefly shown]] right before Kenny's Beyblade is frozen solid by Wolborg. While it's easy to attribute the inexplicable appearance of this figure to RuleOfCool, this being the only time in the series Novae Rog uses that particular animation sequence, the mysterious woman actually ''[[HumanityEnsues is]]'' Wolborg. The lone hint is the tiara worn by the ice maiden, [[MorphicResonance which resembles the small crown on Wolborg's head]].
* In ''Manga/SakuraTrick'', the person Kotone is betrothed to is revealed to be a woman named Sora.
* The John Titor character in ''Anime/SteinsGate'' is actually [[spoiler: Suzuha Amane]]. The anime even uses male voice actor in John Titor's email conversations with protagonist Okabe before the eventual [[TheReveal reveal]].
* ''Manga/AttackOnTitan'' has three examples. Since {{Action Girl}}s are considered normal and acceptable InUniverse, this trope is used on characters that are trying to hide their identity overall, and to give the reader {{Tomato Surprise}}s.
** The Titan Shifter with the ability to become the Cart Titan turns out to be a young woman named Pieck, even though unlike the Female Titan, the Cart Titan is not apparently feminine.[[note]]This is because the author originally designed the titan thinking on a male shifter, but later changed his mind. In later appearances and flashbacks her titan form has more feminine facial features[[/note]]
** During the [[spoiler:Marley]] arc the existence of a ninth Titan Shifter called the "Warhammer Titan" is revealed who is thought to be male since [[spoiler:Willy Tybur said he is the one that has that Titan. It turns to be that the real shifter is his sister, and he only used himself as a bait knowing that Eren would try to [[CannibalismSuperpower eat him to get his titan powers]]]].
** In the same arc, Pieck and Galliard are trapped in a secret hole by a bearded soldier that turns out to be [[spoiler:Yelena]], a very tall woman wearing a fake beard, that hid her identity to [[spoiler:hide her affiliation with Zeke, that at that moment was planning to betray Marley]].


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