The character Hollywood's catchphrase was "Isn't that cute?... But it's WROOONNNGGG!!", which was always delivered over the top no matter how minor the matter was. (When he wasn't shouting, his voice wasn't particularly loud, but it still felt loud with a sort of gruff, obnoxious quality.)
And don't forget Little Red Riding Hood, whose voice seemed to randomly fluctuate between what would be expected of a little girl and a yell with an almost foghorn-like quality.
The king of constant yelling, Yosemite Sam, has a voice so loud and boisterous that it eventually took a huge toll on Mel Blanc's voice. (Sam also liked to punctuate his sentences by firing off one or more of the loaded pistols he kept about his person. In case you've only seen guns on television, they are VERY LOUD when they go off in real life.)
Bugs:(impersonating Theodore Roosevelt) I speak softly, but I carry a BIIIG STICK! Sam:OH YEAH? WELL, I SPEAK LOOOUUUDD! AND I CARRY A BIIIIIGGER STICK!
Tex Avery's MGM short Rock-a-bye Bear has Spike the Bulldog hired as a winter caretaker for a hibernating bear who keeps demanding quiet in the loudest voice imaginable.
Ollie combines this trope with Beige Prose to get the point across...
Tom: And now we go to Ollie Williams with the Blaccuweather Forecast. Ollie? Ollie:IS' GON' RAIN! Tom: Thank you, Ollie.
And of course...
Tom: In local news, we have more on the approach of Hurricane Rupaul as it makes his or her way up the coast. Let's go live to Ollie Williams with the Blaccuweather report. Ollie? Ollie:IS' RAININ' SIDEWAYS! Tom: Sounds rough, Ollie. Do you have an umbrella? Ollie:HAD ONE! Tom: Where is it? Ollie:INSIDE OUT, TWO MILES AWAY! Tom: Is there anything we can do for you? Ollie:BRING ME SOME SOUP! Tom: What kind? Ollie:CHUNKY! Tom: All right, we'll get on that.
From the opening of "Lois Kills Stewie":
Tom Tucker: And now, here's Ollie with a recap of the last episode of Family Guy. Ollie? Ollie:STEWIE KILLED LOIS! Tom Tucker: Then what? Ollie:PETER GOT BLAMED! Tom Tucker: Then what? Ollie:PETER WENT TO COURT! Tom Tucker: Then what? Ollie:LOIS CAME BACK! Tom Tucker: How? Ollie:WASN'T REALLY DEAD! Tom Tucker: Thanks Ollie, and now part two!
(After Tucker's son is arrested for possession of drugs):
Tucker: The student was sentenced to 200 hours' community service and is a very. bad boy. We now go to Ollie Williams for the Punishment Forecast. Ollie? Ollie:HE GON' GET IT!
When marijuana is legalized in Quahog and the entire population is perpetually stoned, he finally speaks at a normal indoor voice.
Tucker: How's the weather, Ollie? Ollie: Ain't too bad.
And then there's Jeff. His voice is so loud and irritating.
Parodied in one episode where Homer is mad about something and is yelling. Marge tells him to use his indoor voice, and he replies "I DON'T HAVE AN INDOOR VOICE!"
Parodied again in another: everyone is complaining increasingly loudly about how Mr. Burns is ruining their lives, to the point where Marge screams, "HE'S CAUSING US ALL TO YELL!" Maggie, being The Voiceless, just sucks her pacifier harder than usual.
Lampshaded in the Band Geeks episode of Sponge Bob Square Pants, Squidward mentions that "Being loud makes you sound smart" in response to the mediocre quality of the band he is in (which Plankton backs up by shouting "CORRECT!"). Squidward then goes on to suggest that if the band plays really, really loudly, people will think they're good. Of course, it backfires....
From the same series, the Cybernetic Ghost of Christmas Past From the Future. Generally accompanying one of his meandering stories.
In the Daria episode "Fair Enough", Quinn's role in a school play causes her little worry until Sandi comments on the "unusual inflections" in the way Quinn says her lines. This gets under Quinn's skin. A later resultant line is spoken with emphasis on every word: "I will make a dainty garland for my head and sing! Laa, la la LAH!..."
Phil Ken Sebben is a more than a little guilty. "I'M SORRY I CAN'T HEAR YOU, I DON'T KNOW IF YOU NOTICED BUT I'VE GOT JUST THEONE EYE!"
Shado the Brain Thief takes this trope to its logical conclusion. Not only does he have no indoor voice, he has no indoor thoughts. Literally every thought he thinks is broadcast into the minds of everyone nearby at a deafening volume. A custodian takes a broom to a nearby PA speaker in an attempt to silence the noise.
On The Fairly OddParents, this applies to a lot of characters, including Timmy, Cosmo, Vicky, and Crocker.
Justified by Cosmo in one episode on the basis that "shouting helps you remember things".
Mom: Well, Rhonda, I think the table is quite squared away— Rhonda of the Seventh Level of Yar: I AM RHONDA, OF THE SEVENTH LEVEL OF YAR! Mom: Yes, you've mentioned that quite a few times. Is there anything I can do to help in the kitchen? Rhonda of the Seventh Level of Yar: NO! THE FOOD HAS BEEN ARRANGED! Mom: Well then, I suppose we should join the boys in— Rhonda of the Seventh Level of Yar: THE DAY OF JUDGMENT IS AT HAND! Mom: Um, alright, if you say so— Rhonda of the Seventh Level of Yar: YOU WILL BE JUDGED! SO SAYETH THE SCRIBES OF YAR! Mom: You know Rhonda, I'm not even sure if I know where "Yar" is. Rhonda of the Seventh Level of Yar: YOU'LL FIND OUT... WHEN YOUR SOUL IS BELCHED FORTH AND DEVOURED UPON THE SHORE OF THE RIVER OF HEADS! Mom: Oh dear. Rhonda of the Seventh Level of Yar: THE RIVER OF HEADS IS IN YAR! THIS I CAN ASSURE YOU! AH HA HA HA HA HA!
Princess Luna, as part of an outdated royal protocol, speaks in a deep booming voice meant to "impress". It doesn't exactly go over well with the citizens of Ponyville. It really doesn't help that it's the same way she spoke when she was Nightmare Moon.
Luna: But this is the traditional royal Canterlot voice! It is tradition to speak using the Royal "We", and to use THIS MUCH VOLUME WHEN ADDRESSING OUR SUBJECTS.
Spelling out this Traditional Royal Canterlot Voice in all-caps is referred to as Canterlock.
In Adventure Time, Lemongrab seems to have a problem with this. He's almost always shouting or talking extremely loudly. Whether he's aware of this is unclear, as his voice is naturally high-pitched and shrill, and he's almost always angry. "IF ANYONE NEEDS ME I'LL BE TAKING A NAP!!!"
Benson from Regular Show. He actually deafens Mordecai and Rigby one time.
LEMME TELL YA' SOMETHIN', TV TROPES!! IF YOU DON'T PUT RATH FROM BEN 10 1 MORE TIME, RATH WILL BEAT YOU UP FOR SURE!!
Brattus from Mr. Bogus often speaks like this, due to the fact that he speaks with a gravelly-sounding voice, courtesy of his voice actress, Russi Taylor.
While it may simply be the tone of his voice, rather than volume, Starscream from Transformers (at least his earlier incarnations) fit this pretty well, due to his near-constant screeching tone. Shortpacked!addressed this.