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Anime and Manga
- Attack on Titan: The female Titan is Annie Leonhart. Armin figures out that she's another human-shifting Titan almost as soon as she appears, but her true identity is a mystery for most of the first season. What makes it obvious is that we know from Eren Yeager's transformation that the Titan form shares certain features with their normal human form (such as hair color). The female Titan is blonde, and there are only two blonde women of note on the show -Krista and Annie. Krista was shown to be elsewhere during the female Titan's attack, so that just leaves Annie.
- In the one-shot all-humor Marvel comic The Fantastic Four Roast (February, 1982) some mysterious figure is trying to off the quartet at the titular fete. After numerous attempts, Ben Grimm says that besides Reed there's only one person with enough on the ball to sabotage the celebration: Dr. Doom. But Doom steps to the dias to deny any such thing.
- In Die Another Day, we find out there's a mole inside the MI6 who has, among other things, informed the bad guys who Bond is. Now, obviously the mole can't be Bond himself, nor M or Q or Moneypenny, as they are all mainstays of the franchise. Besides them, there is only one other major MI6 character in the movie, who — surprise, surprise! — does turn out to be the mole.
- In Captain America: The Winter Soldier, Steve Rogers sets out to discover who has ordered the attacks on both him and Nick Fury. Only one plausible suspect is shown, Alexander Pierce, especially after he makes several vaguely ominous statements like "to build a better world sometimes mean tearing the old one down". Perhaps in awareness of this, the film makes little attempt to disguise Pierce as the culprit and it only takes five minutes after he and Steve meet for him to become a visible antagonist.
- During the second half of Star Trek VI: The Undiscovered Country it turns out there's a traitor among the Enterprise crew, but no one knows who it is. Since it's obvious they're not gonna make any of the series regulars have a Face–Heel Turn after three TV seasons and five movies, there is only one major character available. Yeah, you guessed it, it's Valeris.
- When writing the Lord Peter Wimsey book Five Red Herrings, Dorothy L. Sayers said that people had complained that her previous book Strong Poison had only had one possible suspect for the murderer — as had two of her previous books, Unnatural Death and The Documents in the Case. So she wrote Five Red Herrings with the view that if people wanted to play whodunnit rather than howdunnit, she was prepared to indulge them this one time.
- The Scarlet Letter has two major male characters — Hester Prynne's long-lost husband who only recently returned, and the Reverend Arthur Dimmesdale. The reveal of whom she committed adultery with is not terribly shocking.
- Harry Potter: "RAB" is Regulus Black, Sirius' dead brother. He's a fairly obscure character who'd only been mentioned in passing a couple of times prior to the reveal, so it probably would have been hard to figure out... Were it not for the fact that there are no other characters in the series with those initials. Spoiled by the Format was also an issue, as foreign versions of the books that changed the character's name had to change the initials accordingly.
- In Wilkie Collins's "My Lady's Money," Felix Sweetsir—he is the only person with a motive to steal the money.
Live Action TV
- In the Doctor Who story The Deadly Assassin, the President of the Time Lords is assassinated, and the Doctor framed for the crime. The only suspect who gets any significant amount of screen time is Chancellor Goth, one of the candidates-in-waiting for the Presidency, and he turns out to be the real assassin.
- Towards the tail end of Torchwood: Miracle Day we're told there's another evil Mole in the CIA other than the Obviously Evil, Fat Bastard that was outed earlier. There are three CIA operatives that aren't part of the main cast. One is Da Chief and working pretty diligently with Torchwood and wants the case solved and the mole outed. The other is developing the software to find the mole. That leaves the last one, who was featured prominently in the first episode, who we had just been reminded exists the episode prior, and who just had her wardrobe change up to low cut cleavage showing dresses. To be fair though, the audience is let in on it before the heroes, who were busy juggling the Idiot Ball the entire season.
- In Season 3 of The Flash (2014), Season 3 introduces a new masked villain, "Dr." Alchemy. It also introduces one new supporting character: Julian Albert, an unsympathetic crime-scene investigator who seems to be obsessed with metahumans. Guess who Dr. Alchemy turns out to be. However, in a twist, he doesn't even realize he is Dr. Alchemy, and is Good All Along.
- Subverted in Sleuth (as well as its movie adaptations): the first half of the story features only two characters, and when one of them disappears under suspicious circumstances, it would seem the other one has killed him. But it turns out he never disappeared at all, and the policeman investigating the case is actually the "missing" character in disguise.
- Fire Emblem: The Tellius games have a real problem with this.
- The first game has a subplot about a spy in Ike's army, who is eventually revealed to be Nasir. This would probably be a lot harder to see coming if he didn't meet the heroes right around the time Ashnard mentions getting a spy into Ike's group and then continue to follow them around long after having fulfilled his original deal with them for no clearly stated reason. Genre Savvy players might also be able to pick him out just based on the fact that he's not a playable character at that point in the game, so nothing will be lost gameplay-wise if he betrays you.
- Zelgius is the Black Knight. He's well known as a master swordsman and one of the greatest generals in the world, he's the right build to fit in the knight's very large armor, he uses the General/Marshall class (which the Black Knight's unique class is a modification of) and even shares some of the Knight's otherwise unique animations in cutscenes. Like Nasir above, he isn't a playable character. All of this by itself isn't necessarily damning, but when you combine it with the fact that there's no other viable candidates, it becomes really obvious.
- Bertram is Renning. His helmet doesn't cover his mouth, and there's not a lot of other characters with green goatees.
- This trope is used frequently in various versions of Scooby-Doo. Subverted in one episode of What's New, Scooby-Doo?, though: the crook in "It's All Greek to Scooby" turns out to be some random person the gang has never met beforehand. Velma naturally is rather displeased and keeps insisting her theory about who was the monster was at least plausible.
- In the My Little Pony: Friendship Is Magic episode "Rarity Investigates", Rainbow Dash gets framed for a petty act of treachery so that she won't break the long distance speed record. There's only one significant character introduced: Wind Rider the holder of said record.