Will launch in one hour if there are no objections Now Up for Grabs; this trope is rather spoiler-heavy and I'm not a spoiler-hound. You're getting close. The clues are fitting together, and everything is unraveling. You're this close to finding The Man Behind the Man. Your trail of clues finally ends, and the mastermind is... ...the little kid that was always playing jacks in the park?! Yes, that's right. The Man Behind the Man turned out to be about the least conspicuous person possible. The Hidden Villain was underneath your nose the whole time. The Dog Was The Mastermind. This trope is when through a rather jarring plot twist, the true Big Bad or The Man Behind the Man turns out to be a seemingly completely inconspicuous character, the last person anyone would ever suspect. You saw him time and again before and you never suspected a thing up until The Reveal. Sucker. Simply identifying the dog isn't enough to satisfy the requirements of this trope; The Reveal has to be a surprise both to the heroes and to the audience -- the Hidden Villain was in plain sight all along, without any clues or hints as such. Keep in mind that this is a Reveal Trope, so beware of spoilers!
Examples:Anime and Manga