History VocalEvolution / WesternAnimation

* ''WesternAnimation/{{Teenage Mutant Ninja Turtles|1987}}''(1987): The original voice actors of the boys in green have had their voices evolve over the course of the series.

* ''WesternAnimation/ThePowerpuffGirls1998'': The narrator's voice sounds noticeably deeper since the show switched from cell animation to digital ink.

* ''WesternAnimation/DoraTheExplorer'': Kathleen Herles' voice for Dora has become much higher-pitched and more helium sounding in the third and fourth seasons.

* Compare Creator/TonyAnselmo's performance as WesternAnimation/DonaldDuck in the first episode of ''WesternAnimation/DuckTales1987'' to his performance in ''VideoGame/KingdomHeartsII'' (2006). It was rather rough around the edges when he originally took over from Clarence Nash, but has improved considerably in the past 30+ years. And in ''WesternAnimation/DuckTales2017'' he is much more comprehensible and can pull of an impressive range of emotions with it.
* As Clarence Nash aged his voice for WesternAnimation/DonaldDuck became rougher and raspier, compare the classic shorts to ''WesternAnimation/MickeysChristmasCarol''.

** Creator/JulieKavner distanced Marge's voice from her natural tone as seasons progressed, gradually making her higher and wackier-pitched. She's also gotten noticeably raspier in the most recent seasons, largely due to Kavner ageing.

** Gumball and Darwin's voice actors progressively get older during the show's production, leading to their voices becoming deeper. This is even lampshaded in [[Recap/TheAmazingWorldOfGumballS3Ep1TheKids two]] [[Recap/TheAmazingWorldOfGumballS5Ep11TheCopycats episodes]] which end on Gumball and Darwin suddenly getting new voices as their old ones officially hit puberty.

** [[CharacterAgedWithTheActor Finn's voice becomes deeper as he grows older and his actor ages.]] As such, they justified this in-universe by having Finn turn 13 in the middle of season two. Comparing the voice of early season Finn to that of the late season is like comparing night and day.

** Peter's voice was also thicker before season 3 had aired.

** Come season four, Kim herself has become quite nasal and her pacing at times feels intensely rushed.

** On the other hand, Mac's voice became a bit deeper towards the end of the first season and goes even lower during season three due to his voice actor going through puberty. [[WiseBeyondTheirYears Works good enough.]]

** Stan and Kyle's voices have also become lower in pitch since the first couple of seasons. Stan kind of sounded like [[Anime/DragonBallZ Gohan]] as a kid until about season 3.

** Craig's voice became higher at one point in the series but has gotten significantly deeper and nasaler after season 12, most notably "Pandemic".

** The most noticeable is Jane Lane's Wendy Hoopes who originally gave the character a sly, high pitched tone which would eventually evolve into a deep, round tone by season five.

** Timmy's voice was a little lower in season one than in the rest of the show.

** Starscream's Hungarian voice from the same show changed drastically from the beginning of the series to season 2. At first, he sounded like a somewhat younger and less raspy version of the original (the same as Hungarian [[WesternAnimation/BeavisAndButthead Beavis]]). Now, he talks in a near-constant high-pitched, shrill tone, making him sound exactly like his voice actor's performance as Gollum from ''Film/TheLordOfTheRings''.

** Penny originally had a lisp in some of her earlier appearances in the ''Oh Yeah! Cartoons'' shorts, but Hynden Walch dropped it in season one.

** The title character's voice (in the Nickelodeon series, played by Creator/BillyWest) was much more high pitched and nasal in the pilot, "Doug Can't Dance". Around season four, Doug's voice noticeably gets lower and closer to [[WesternAnimation/{{Futurama}} Fry's]] voice. Then ''Doug'' crossed over to ABC and West was replaced by Thomas [=McHugh=] after wanting nothing to do with the new version of ''Doug'' – [=McHugh's=] Doug voice is even lower and less nasal than West's was by the end of the Nickelodeon series.

** Since the beginning of season six, the voices of some characters are noticeably higher-pitched. In particular, Twilight Sparkle sounds ''younger'' than she ever has before, despite growing up both figuratively and literally since the show started.

** By season 1A Steven's voice had notably deepened, getting closer to Zach Callison's natural voice. Season 3 seems to have reverted it as Steven's voice is ''higher'' pitched sounding in episodes like "Steven Floats" than it originally was. His voice evolved again after the TimeSkip; Callison stopped pitching his voice up and just started using his natural voice, reflecting Steven’s own InUniverse aging.

** In season 2, Sean's voice gets deeper and raspier due to William Ainscough going through puberty.

* In ''WesternAnimation/DragonTales'', Max's voice sounds slightly deeper in season 3 due to his voice actor hitting puberty between seasons 2 and 3.

* ''WesternAnimation/JackieChanAdventures'': Jade and Paco's voices deepen as their actors matured. Jade started in season three, and Paco's around season four.

* In the first two seasons of ''WesternAnimation/BobsBurgers'', Dan Mintz's voice for Tina would never raise beyond a monotone. By season 3, Tina retains her monotone voice, but would start occasionally shouting when provoked.

** In season 2, Gumpers' voice went from slow and lethargic to sounding higher and more energetic.

** Kirsten originally sounded normal and plain in her first two appearances due to being voiced by Vanessa Thompson, an actual child actor, but once Creator/StephanieBeard replaced Thompson starting with "The Last Stand", her voice got higher-pitched and squeakier.

** Creator/KevinConroy's voice for Franchise/{{Batman}} was much different in his later years than it was when he first started. In spite of Conroy being famous for creating a stern, effective and iconic Batman voice without resorting to [[GutturalGrowler Guttural Growling]], his initial Batman voice was deeper and had a bit of a growl to it. Starting around the time of ''WesternAnimation/TheNewBatmanAdventures'', his voice became higher and lost most of the growl, with Conroy later confirming that he changed the voice due to the strain it put on his vocal chords. Unfortunately, he also stopped bothering to differentiate between Batman and Bruce Wayne's voice. (On the commentary track for ''WesternAnimation/BatmanGothamKnight'', Conroy stated that he was requested to do so at the producers' behest.) Bruce originally had a lighter and more playful tone than Batman's dark and foreboding tone. Conroy made the differentiation for at least one episode of ''WesternAnimation/JusticeLeague'' ("Maid of Honor") where Bruce Wayne had to make a public appearance. Other than that, Conroy's stance was that Bruce Wayne is the act, and his performance reflects that.

*** This can be extended to him voicing his live-action movie counterparts in ''[[Film/TransformersAgeOfExtinction Age of Extinction]]'' and ''[[Film/TransformersTheLastKnight The Last Knight]]''. However, while his voice is similarly deep and gravelly, unlike his ''Prime'' voice, Frank's take on live-action Megatron is more of a [[GutturalGrowler constant snarl brimming with barely-restrained rage]]. The two voices can overlap when both versions are sufficiently enraged, but most of the time, both contemporaneous cases of VocalEvolution are mostly distinct.

* In the early pilot of what would later become ''WesternAnimation/TheProblemSolverz'', Alfe started out with a normal voice that was only slightly low. In ''WesternAnimation/NeonKnome'' he became a very low GutturalGrowler which was lightened up in the ''The Problem Solverz'' to reflect his more impetuous personality. Roba's voice was also lower in the first pilot, and since then it's gotten higher with a robotic filter added on. Horace has a [[TheOtherDarrin different voice actor]] for the series as well.

* In the two ''[[WesternAnimation/AdventuresInMusicDuology Adventures in Music]]'' cartoons from 1953, Professor Owl is voiced by Bill Thompson with a voice that's soft (except when he has to deliver a BigShutUp) and has a slight owl-like "hoot" in its tone. Decades later, in the ''WesternAnimation/DisneySingAlongSongs'' series that reuses footage of Professor Owl for its framing segments, the character is voiced by Creator/CoreyBurton, who in the earlier videos of the series gives him a higher, more nasal voice than Thompson gave him (but not unlike the voices Thompson used for [[WesternAnimation/AliceInWonderland the White Rabbit]] or [[WesternAnimation/PeterPan Mr. Smee]]). By the later videos, however, Burton replaces that voice with a much closer impression of Thompson's 1953 version.