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Anime and Manga
- Hei of Darker Than Black has his voice deepen when he goes from his persona as Li into his identity as the "Black Reaper". It's not for nothing they call him Chinese Electric Batman.
- Lelouch from Code Geass speaks with his regular teenager voice when in his civilian, Rich Idiot with No Day Job persona, but switches to a much deeper, booming (read: much more epic) voice when acting as the Rebel Leader Zero.
- The Dark Knight Trilogy
- The deepening of Bruce Wayne's voice when he puts on the Batman costume is taken Up to Eleven- he sounds like he's gargling with gravel. Oddly, he still does this even when he's talking to people as Batman who know his secret identity.
- He takes this to another level in Batman Begins where he has his normal Bruce Wayne voice, a raspy voice for talking to allies as Batman, and the gravel-gargling voice he uses when trying to scare the crap out of bad guys.
- In Batman v Superman: Dawn of Justice, Batman uses an electronic voice modulator to alter his voice.
- In Green Lantern, Ryan Reynolds as Hal Jordan plays with this a bit - speaking in his dramatic superhero voice when trying to impress Carol Ferris as Green Lantern, but she soon sees through this.
Carol: I've seen you NAKED! Did you think I wouldn't recognize you because you covered up your cheekbones?!
- Iron Man: Stark's Iron Man armor's helmet makes his voice more mechanical.
- Parodied in Spiderman Homecoming, where Peter Parker's suit (also made by Stark)'s "Enhanced Interrogation Mode" gives his voice a comically deep filter.
- Senator Palpatine/Darth Sidious in Star Wars. Palpatine loses the "normal" voice entirely after Mace Windu's attack, when he becomes Emperor.
- In On Her Majesty's Secret Service, in the scenes where Bond is impersonating an expert on heraldry George Lazenby is dubbed by the actor who played the real expert.
- In the Batman television series, Bruce Wayne was put into a situation involving him Holding Both Sides of the Conversation. Since he's on a phoneline, it's just a simple matter of switching between his Batman voice and his Bruce voice.
- Oliver Queen, Sara Lance and Barry Allen all make use of voice modulators in their superhero guises. The Reverse Flash and Zoom both sound noticeably deeper when in costume as well.
- Hunter Street: When disguised as HoodieHead, Sophie has a vocal modulator to change her voice to be unrecognizable.
- Ratchet & Clank
- In Ratchet & Clank: Going Commando, the Thief sounds like a digitally distorted man while wearing their costume, but she has a regular-sounding female voice once the costume is off.
- In Ratchet & Clank Future: A Crack In Time, at one point, Ratchet pretends to be Dr. Nefarious in order to use the laser in his space station to destroy his fleet of ships. This disguise, of course, comes with that character's voice.
- BlazBlue: Hakumen wears a full-body armor and a deep, echoing voice courtesy of the armor. His voice is actually much softer, courtesy of him being an alternate timeline Jin Kisaragi.
- Done by two characters in The Legend of Heroes: Trails of Cold Steel: "C" wears a helmet that modulates his voice, disguising his true identity of Crow, and Thomas notably adopts a deeper, more serious tone when he drops his facade of being a carefree, lackadaisical teacher and reveals he's actually the Second Dominion of the Gralsritter.
- The Arkham Knight uses an electronic voice modulator to distort his normal voice. Given that Batman would recognize Jason's voice otherwise, it does its job well.
- In DuckTales, Fenton Crackshell is a nebbishy accountant with a voice to match, but when he puts on the Gizmo Duck costume, he becomes The Cape and starts talking in stock hero speak.
- While less drastic than in the Nolan films, in Batman: The Animated Series, Batman has a lower voice than Bruce Wayne.
- The Spectacular Spider-Man
- Quentin Beck who is a fairly mild-mannered guy talks in a hammy faux-British accent when being Mysterio.
- The Green Goblin has a personality so different from his civilian identity that it is appropriately represented by giving the two separate voice actors. Interestingly, this version of the Goblin isn't crazy (Well, technically. He's probably a psychopath, but he doesn't have multiple personality disorder).
- In the 1960s Spider-Man series, Spider-Man's speaking voice is about an octave deeper than Peter Parker's, even when there's no need for it (e.g., when he's talking to himself and there's nobody else around).
- Just like the original Batman, in Batman Beyond Terry's voice also changes in when he's in the bat-suit, though it's explained to be something the suit actually does somehow to help disguise his identity.
- Unlike BTAS, The New Batman Adventures and following DCAU entries avert this, with Batman and Bruce Wayne having the same voice.
- Also from DCAU, the Batwoman in Batman: Mystery of the Batwoman has a voice unlike her real identity (that is, any one of the three). This overlaps with Cast as a Mask as the Batwoman has a voice actress that doesn't voice any of the other characters.
- Parodied by Buttercup/"Mange" in The Powerpuff Girls episode where they decide that they all need secret identities to be "real" superheroes.
- In South Park, Kenny does this when dressed as Mysterion.