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Anime and Manga
- In My Bride Is a Mermaid, Unlucky Everydude Nagasumi turns into a Kenshiro expy while under the influence of the Song of Heroes. Or just when sufficiently pissed off.
- Yu-Gi-Oh!: Any time Yugi and his Millennium Puzzle-residing alter-ego do a Mental Fusion, expect Yugi's voice to plummet faster than the Tower of Terror. This goes double for the dub, thanks to none other than DAN GREEN! (and it gets deeper over time). The voice is actually the Pharaoh's voice and is naturally that deep (so Yugi's just "borrowing" it) and in Yu-Gi-Oh! GX, older!Yugi is shown to have the exact same voice.
Kaiba: "Wait. Did your testicles just drop in the last five seconds or something? What the heck happened to your voice?"
- Archer's voice in comparison to Shirou's.
- In Bleach, this happens to the Visored when they put on their Hollow masks.
- Inverted, whenever Ichigo transforms into a Hollow. His voice gets higher.
- Inverted again, with Kaname Tousen whose voice gets higher after activating his Resurrección.
- In Rosario + Vampire, Inner Moka has a much deeper voice than Outer Moka. Ironically, Inner Moka is the real one, that means it's her natural voice.
- Naruto's voice gets noticeably deeper while using Kyuubi's chakra.
- Like Ichigo above, Juugo's voice gets higher when he uses Level 2 of the Cursed Seal's power.
- Goku and Gohan's voices got noticeably deeper when they transform into Super Saiyajin 2 and 3 respectively.
- Goku's scream as he transforms into a Super Saiyan for the first time. More noticeable in Kai.
- In the English dub (original and Kai), Freeza's voice gets progressively deeper as he transforms - and then crosses the Bishonen Line along with the rest of him, reverting to something like his first form.
- In Dragon Ball GT, Goku's voice is as its lowest pitch when he is Super Saiyajin 4.
- Mirajane Strauss from Fairy Tail voice gets deeper while using her Take Over Satan Soul.
- Tsunayoshi Sawada from Katekyo Hitman Reborn! when in Hyper Dying Will Mode.
- Seras Victoria from Hellsing sounds much deeper after drinking Pip's blood.
- In the dark magical girl anime Il Sole penetra le Illusioni, Akari's voice is deeper when she's in her Tenebrae form.
- Honoka Yukishiro and Nozomi Yumehara from the Pretty Cure franchise get noticeably deeper voices in their Cure forms, Cure White and Cure Dream, respectively. Aguri Madoka, too, but in her case it's justified because Cure Ace is her Older Alter Ego.
- Hibiki and Chris from Senki Zesshou Symphogear have noticeably deeper singing voices when they are in IGNITE Mode.
- Whenever Hibiki and Maria (or basically anyone) fail to go into IGNITE Mode, they go berserk, turn completely black and become more bestial. Their voices drastically deepen.
- In the Marvel Universe, Tyrone Johnson's voice became much lower when he changed to his Cloak superhero identity.
- The comic versions of Ghost Rider all get deep, scary voices once they change from their human identities to the Rider. Typically, it's represented by a change in their speech bubbles (speaking in italics, with the bubbles now outlined in black fire, or speaking in white text in black bubbles, and so on).
- Some incarnations of Superman actually do this as a deliberate affectation to make himself sound less like Clark Kent.
- Averted in Nexus. When Jack's in his demon form, his voice has a metallic edge; much like the Autobots.
- Children of an Elder God: When Gendo and Yui seized the power stolen from the Outer Gods by the main characters, their voices plummeted and boomed when they talked.
- In Thousand Shinji, when the main characters ascend to godhood, their voices plummet and boom when they talk to their followers.
- Advice And Trust: When Rei uses her hidden power, her voice becomes throatier and deeper, and she actually growls.
Films — Animated
- In The Little Mermaid, Ursula, the movie's Big Bad, already had a pretty deep voice. After she uses the trident's magic to empower herself and grow to a humongous size, her voice becomes downright demonic. This is more noticeable in the Latin American Spanish dub of the film.
- My Little Pony: Equestria Girls – Friendship Games: Zig-zagged. Human!Twilight's voice gets deeper when she initially transforms, and returns to her usual voice when Spike reminds her of herself. Sunset's voice is unaffected when she transforms. Only evil power makes your voice deep. The first Equestria Girls played this trope straight when the then-evil Sunset transformed into a she-demon under the power of Princess Twilight's crown.
Films — Live-Action
- Blackheart from the movie Ghost Rider gets this magical power once he summons 1000 souls into his body. That may have been the only benefit from the whole deal; unless standing around getting blown up so you can slowly reform again is highly sought after in demon society.
- Done for humorous effect in Batman Forever:
- Galadriel's voice got pretty deep (and reverbed) in the first The Lord of the Rings film when she was imagining what she would do with the kind of power provided by the One Ring. However, Galadriel is already plenty powerful, so all the deep voice and special effects that went with it were her own doing.
- When Tia Dalma once again becomes the sea goddess Calypso in Pirates of the Caribbean: At World's End, her voice grows extremely deep and reverbed. It could be because she was also extremely pissed off. Growing to a size so massive that she dwarfed the Black Pearl and all of its crew might've also had something to do with it.
- The High Seekers in the Novels of the Change, controlled by some unearthly force, sometimes go so deep that it's represented by boldface. This usually heralds the good guys getting a royal spanking.
- Subverted in Artemis Fowl, when the characters expect this, but get a falsetto instead.
Number 1: "I know. Less airy, more fairy, right?"
- In the Star Wars Expanded Universe there are a few times when the Sentient Cosmic Force decides to convey something to a young Force-Sensitive in a less ambiguous fashion than usual, and actually takes on a voice that seems to come from deep inside of the person. This either sounds like someone the person knows who has died and joined with The Force, or it sounds a lot like them.
- Rebel Force has Luke Skywalker think that the voice sounds like his, but deeper, older, more certain. He assumes it's his father's voice encouraging him from beyond the grave. We know it's not.
- Galaxy of Fear has Tash Arranda similarly encouraged and hearing an older-Tash voice. Before that, the Force swells in her when she's commanding someone to stop and not kill her uncle and she doesn't recognize it as hers — it's lower, commanding, and forceful.
- Doctor Fate in Smallville sounds deeper than Kent Nelson.
- Willow in Buffy the Vampire Slayer gets amped up on mystical magic powers and Alyson Hannigan speaks the character with a slightly lower and slower tone and speed.
- Bailey from The Suite Life on Deck when she's possessed by Princess Xaria. This also happens to London in the same episode, but as a closing gag.
- Anyone in Stargate SG-1, when possessed by a Goa'uld symbiote, although it's actually the Goa'ulds invoking the trope. They can use normal voices if they want to, but they want people to think that they're all-powerful gods, so they change their voice to match people's expectations.
- Merlin gets into this when Merlin begins speaking Dragon-language. His regular magic doesn't usually deepen his voice, but the dragon calls do.
- Supernatural's Misha Collins made a deliberate decision to have his voice as Castiel, the extremely powerful angel, be deeper than his normal voice—it was a one-shot character, right? Four seasons later he kind of regrets it. He got to use his normal voice in one episode, in which the man Castiel has been using as a vessel appears.
- Doctor Who:
- In "The Evil of the Daleks", the Emperor Dalek has a noticeably deeper voice, modulated at a lower frequency, than the other Daleks. (Avoided with the normal Supreme Daleks, who tend to have higher-pitched voices than the other Daleks, making them sound like they're on the verge of snapping from stress.)
- There are some clever justified examples in "The Robots of Death," when the Doctor gets Leela to release helium into a room in order to rob Taren of his Compelling Voice. He takes full command of the situation, the villain and Leela get really squeaky and the Doctor mocks them for it, but his own voice remains as deep and velvety as ever (Power Keeps Your Voice Deep). Apparently, being a Time Lord gives him 'a larynx that can put up with anything', though Rule of Cool is the obvious Doylist factor. We also get Lack of Power Makes Your Voice High, as the amount of gas and thus the effect of the helium on Taren's voice increases as Taren loses control of his robots and thus his power, until he literally squeaks himself to death.
- Chase Davenport in Lab Rats, whenever his "Commando App" is activated and he becomes Spike. In the "Spike vs. Spikette" episode of Bionic Island, Kate and Bree have their own Commando Apps installed and activated, with their counterparts (Spikette and Spikerella) also in possession of boomingly deep voices.
- Margaret Thatcher was depicted this way in satirical puppet show Spitting Image. In contrast, the male members of her cabinet ('the vegetables'') were given thin, weedy, ineffectual voices.
- This trope's roots may have sprouted from the radio drama The Adventures of Superman, in which the same voice actor used his tenor range for Clark Kent and his baritone range for the superhero. Most exemplified when, in order to show that Clark Kent was changing outfits, the voice actor would start out in his Clark Kent tenor saying "This looks like a job," then his voice would drop nearly an octave and he'd finish with "for Superman!" This may have been the inspiration for the trope cropping up in other works as part of how Clark maintains his Secret Identity with no props except the glasses.
- (Kajin no) Soki in Tatsunoko vs. Capcom. For his Level 3 Hyper, he assumes his Black Oni Onimusha form, donning a mask with red eyes and a mane of white hair. His voice goes from "Boisterous Bruiser" to "Holy hell! He sounds like Satan!" Said voice is also booming and incomprehensible, but his voice drops from bass to baritone in no time flat.
- In Devil May Cry 2 (the one nobody talks about), when Dante's health is at critical levels (his lifebar will be flashing red), activating his Devil Trigger will cause Dante to morph into a stronger, bigger, invincible alternate form (Devil Trigger Majin Form) able to mow do anything in the game with ease. While all of Dante's Devil Triggers echo (except for in the first game), this one has a much deeper, demonic sounding voice.
- In Devil May Cry 3, Arkham manages to unlock the dormant power of the Sparda sword. Three guesses on what happens to his voice.
- Nelo Angelo (aka a Brainwashed and Crazy Vergil) has an unnaturally low voice. According to The History of DMC, Mundus destroyed Vergil's original body and placed his soul into an artificial, yet powerful construct. Compare this to Vergil in 3, where his original form had a slightly raspy, but still normal-sounding voice.
- Arius, the Big Bad of 2, gets a deeper voice when he's killed and revived as a demon by Argosax's power.
- Whenever Nero uses his Devil Trigger in 4, his voice gains a deep booming echo.
- Invoked in Jak 3, where the Precursors, revealed to be fuzzy little Ottsels with not-so-impressive voices, use a voice-manipulating device to get that "uber powerful ancient" boom. They know they wouldn't be taken seriously without it.
- In Guild Wars: Nightfall, Kormir's voice becomes layered over a less high voice when she replaces Abaddon as the God of Secrets.
- When Link wears the Fierce Deity Mask in The Legend of Zelda: Majora's Mask, he physically becomes older, and therefore his voice becomes deeper.
- In Viewtiful Joe 2, when Blade Master Alastor is defeated, the Black Film controls/empowers him, warping him into the even more demonic Underworld Emperor Alastor. When the transformation is complete, his voice quickly deepens. Cue Round 2, where he has a slew of new tricks, more power and defense, and a much larger healthbar.
- In Castlevania: Rondo of Blood, Dracula's voice deepens mid-word as he transforms into a massive bat-creature for the second part of the battle. Conversely, when that form is defeated, he roars in pain, and his voice spontaneously rises back to normal as his transformation is forced to revert.
- Dota 2:
- Undying, a zombie whose ultimate is an ability which transforms him into a much beefier version of his regular self. That includes his voice. (This soundset can be heard from 1:14.)
- Earthshaker's voice is automatically ridiculously deep, and you better believe that he lives up to his name.
- One of Terrorblade's abilities also transforms him into a demon, which obviously simultaneously makes him both more powerful and makes his voice even deeper, too.
- Hearthstone: Heroes of Warcraft couples this with one card's mechanic. The card, Questing Adventurer (3 mana, 2/2, gains +1/+1 for every card you play), has his voice grow deeper as his effect stacks.
- Neptunia: The CPUs' and CPU Candidates voices generally become deeper after transforming into their goddess forms. Some of them are more or less Older Alter Egos to their human forms, but rather than just gaining a more mature voice, the pitch of their voices get drastically lower. While in Yellow Heart's case, her voice really just only becomes more mature, for characters like Purple Heart and Iris Heart it is more than that. Particularly seen in Neptune/Purple Heart's case. The older version of Neptune doesn't reach Purple Heart's low voice even at the slightest.
- This trope only appears subtly to Purple Sister and White Sister Rom. Their goddess forms have still very high voices and the change is not nearly noticeable like the other two CPU Candidates, but you can hear more confidence and a very slightly lower pitch in their voices. In White Sister Rom's case, her voice also becomes a bit frostier.
- Inverted with Black Heart in the first two games, and averted in the third. This trope plays straight since Hyperdimension Neptunia Re;Birth1.
- Inverted with Orange Heart, whose voice becomes much higher and girlier, as her voice is already deep and tomboyish in her human form. The Planeptune CPUs (not counting the CPU Candidate Purple Sister) generally have a huge character change after transforming. While Purple Heart becomes more serious, stoic and tough, and Iris Heart becomes more dangerous and (sexually) aggressive, Orange Heart becomes softer, more cheerful and girlier.
- The original CPU quartet can transform into their Next Forms in Victory II, making their voices even deeper than they already are.
- Mike Morningstar from his debut in Ben 10: Alien Force, where he uses the full extent of his powers after revealing himself to be the villain of that episode and siphoning off of Gwen's mana. His skin turns gold, while his voice noticeably deepens and gains an echo effect. When depowered, Mike's voice returns to normal. As Darkstar, however, it's back to said deepness, but this is a subversion, as it's an effect of his Cool Mask.
- He-Man and the Masters of the Universe (1983)/She-Ra: Princess of Power: Both He-Man and She-Ra's voices get significantly deeper when they do their Transformation Sequences. Overlaps with Older Alter Ego.
- The Superman Theatrical Cartoons do the same thing as the radio serials (using the same actor, no less).
- In ThunderCats (2011), Lion-O's voice gets deeper whenever he uses the Sword of Omens and shouts "ThunderCats, ho!"
- In Ralph Bakshi's animated Spider-Man series from the 1960s, Peter Parker deepens his voice while donning the Spidey suit.
- In Spider-Man: The Animated Series, Black Cat's voice gets deeper when she transforms or uses her powers.
- In Iron Man: Armored Adventures, Pepper incorrectly answers the test in the trial for uncovering the fifth Makulan ring. This results in her being taken over by a volcanic entity (which was previously controlling Rhodey), gaining fire powers and a booming voice, and going into a berserk fury while shouting lines like "You are not worthy!" as the energies within her body threaten to cause worldwide volcanic eruptions that will eventually blot out the sun.
- Avatar: The Last Airbender/The Legend of Korra: When Avatars such as Aang and Korra go into the Avatar State, this is the general effect — though it's because the spirits of hundreds of past lives are speaking through them, all at once.
- Truth in Television, funnily enough. Men will subconsciously deepen their voices if they feel confident or superior to the person they're talking to. (And the other way around — if you feel inferior, your voice gets higher.) Has to do with establishing dominance. Hence, not only will a person with a very deep, gravely voice subconsciously be seen as a powerful individual, BEING powerful will also cause you to lower your voice without realizing it.
- Logically, a larger person or animal will naturally have the deeper voice, simply by having larger proportionate vocal cords. You don't see many tall men or women with high-pitched voices, even when they're not trying to sound powerful or threatening.
- Male frogs and toads developed their extensible chin pouches so that their mating calls would sound deeper and more resonant. This suggests larger body size to females, which seek out the biggest males to father their offspring (because only males with a good set of genes live long enough to grow big).