Deaths include impalement, explosion, and being eaten, done to Ghost Princess, Clarence, and one of the fruit witches from "Dad's Dungeon", respectively. That last one is a rather bloody death too.
In the episode "No One Can Hear You", Freak Deer is killed when a piece of rubble snaps his neck. If that didn't kill him, being chucked into a river to his doom shortly after certainly did.
In the Alternate Universe"Farmworld", alternate Ice King is crushed by an unexploded bomb and starves to death; we don't see that but we do see his skeleton, still trapped. Later, after the bomb explodes, alternate Marceline is melted in a toxic pool.
In "Wake Up", the person that dreams Prismo is turned to ash by the Lich, onscreen. Jake wasn't the only one who was shocked and horrified about that.
He recovered several episodes later thanks to a complicated plan.
In Alvin and the Chipmunks Meet Frankenstein, the main characters bury an (imagined) monster alive while singing, "We'll make this place his tomb!" Still not disturbed? Well, the monster was nice!
The animation version of The Animals of Farthing Wood loved this. One character, a puffed up bullying pheasant, got a My God, What Have I Done? moment when he sees the cooked and roasted body of his wife cooling on the windowsill (a death he unintentionally caused). A set of mice babies is impaled on a thorn bush by a vicious butcher bird, who not only gets a Karma Houdini but gets to mock the other animals for their squeamishness. An ultra-cute family of newts is hinted to have burned to death. A baby rabbit is shot. Mrs. Mouse (the one who lost her babies) is killed and eaten by one of the main characters, who didn't recognize her. They didn't go for Karmic Death either; one of the first real villains gets assassinated by the resident Sociopathic Hero.
Roku's death in the Whole Episode Flashback. Basically he gets hit directly in the face by a vent of poison gas and falls over, after which his friend abandons him and his dragon tries to cover him when they're both engulfed in a pyroclastic flow.
Combustion Man dies from exploding, after his third eye is messed up by Boomerang.
Jet dies from getting his chest crushed by a jagged chunk of rock. (Thanks to the ever-looming Moral Guardians, his death was rather ambiguous, and they make a gag out of it in "The Ember Island Players.")
Zuko: Did Jet just...die? Sokka: Y'know, it was really unclear.
The deaths of Noatak and Tarrlok in The Legend of Korra die in an explosion, after Tarrlok opens the fuel cap of their getaway boat and activates an electric glove over the top of it. It's not graphic, but it's no less amazing that Mike and Bryan still managed to get away with a Murder-Suicide on a Saturday morning Nickelodeon show.
Zaheer demonstrates that it is indeed possible to asphyxiate people with airbending. He bends the air from the Earth Queen's lungs, and her slow death is shown entirely on-screen as she first struggles for breath, her eyes turning bloodshot, and finally collapses. While the dialogue rather jarringly avoids 'kill' or 'dead' (she was 'taken down', or is 'no more'), there is no ambiguity at all over what has occurred. Once again, it is not graphic in the sense of bloody violence but is a startling example of the trope in such a show.
Three of the four Red Lotus members get this. Ming Hua is visibly electrocuted to death. Ghazan seemingly dies in a collapsing lava cave. And P'li has her Combusion Bending literally explode in her face, having a breastplate thrown over her head just as she was about to fire her ability.
Clayface lent himself to scenes like this. Two most shocking examples were when he absorbed Batman, and we see Batman's silhouette flailing around inside him, and almost not making it out alive, and when he absorbed his "daughter", a creation of his clay that had mutated into its own personality.
The Ventriloquist has a split criminal personality manifested as a Demonic Dummy, Scarface. Scarface technically isn't alive, so he would get butchered in various methods, onscreen. He's been shot up by machine guns (twice) and shredded repeatedly.
Batgirl's death in "Over The Edge". It's All Just a Dream caused by Scarecrow's fear gas however it doesn't stop her death from being any less graphic. She falls several stories off a building onto a car - a cop car her dad was driving in no less - and is noticeably bruised up. She ends up dying quickly in her fathers arms.
In the episode "Sneak Peek", a tabloid reporter gains the ability to go through walls. He finds out that Terry is Batman and Terry tries to convince him not to reveal his secret. Unfortunately, he's hit with a case of Power Incontinence and starts to be like this permanently, falling through several stories. Terry tries to rescue him, but the reporter couldn't stay tangible for long and just keeps falling, presumably to the center of the earth.
One episode had the intensely disturbing scene where a man fell into a hole slowly filling with toxic waste. His limbs fell off when he hit the ground.
The episode about "Splicers" which ended with the Big Bad injecting himself with so much animal DNA he mutated in a gigantic blob-crab-monster. Yikes!
The episode where Bane's crony died from taking way too many venom-derived slappers, while Bane himself was in an all-but-dead vegetative state.
The show specialized in doing this while making it a Gory Discretion Shot. People were fed to crocodiles, run over by trains, and exploded. The one that sticks out is the end of "April Moon", where a doctor attempts to save his wife from the gang by giving them new equipment. By the end of the episode, it's revealed that his wife was actually in on it the whole time and was cheating on him with the gang leader. The doctor knows, but the leader doesn't. So he comes in to get upgraded anyway, and the pissed-off doctor tells him that everything will be fine as he lowers a drill toward his face. Cue black.
The same episode also features the gang's mechanical limbs eventually breaking apart, even leaving one member armless and legless. Despite the fact that they're fake robotic limbs, the writhing and groaning in agony of the gang members is still quite disturbing.
In Batman Beyond: Return of the Joker, the Joker is killed off fairly early in the story. There are actually two versions of the death scene. Originally, Robin shot the Joker. The Moral Guardians thought this was too violent, so the scene was reanimated to show the Joker getting wet and tangled up in wires, slipping and accidentally electrocuting himself.
Black Mask pulled a You Have Failed Me on his Number One by using Nth metal to make him float upward until he's stopped by a ceiling window, talking to him for a bit, then opening the window. It would probably be a lot worse if Mask's next action (picking a new Number One with the exact same line as the one he just killed) wasn't completely hilarious.
While he actually survives, it was pretty startling to watch The Batman vs. Dracula and suddenly see the Joker falling into a river while his own joy-buzzers electrocute him and he screams while sinking. Add the occasional electrical surge where you see his silhouette sinking deeper into the water. The same movie also has the real death of Dracula: Batman uses a device that stores energy from the sun on him and he is burned alive and Batman gives him a blow that knocks him into pieces, sending ash and bone everywhere.
The premiere episode had a scene that averted the Bloodless Carnage trope on a TV-Y7-FV rating. Specifically, after a particularly intense fight, Ben looks to the stomach of the alien helping him, saying "your suit is leaking water". The alien puts his hand to the bluish liquid, brings it up within view of the camera, and gravely mumbles "that's not water" before falling down into his death throes.
Ben 10: Ultimate Alien had some gruesome deaths of its own. Those include alien crook Mizaru being eaten alive by a giant carnivorous worm (though this one is played for comedy); Fallen Hero Carl Nesmith killing his doctor off-screen and leaving his dead body in a cold chamber, where he is found by Ben and Gwen; and Anti-Villain Old George being electrocuted by Diagon until he turns into ashes. We also see two cases of Impaled with Extreme Prejudice just offscreen behind a Gory Discretion Shot. While getting stabbed with swords is a fairly mundane way to die, it's still pretty high up the "holy crap, did they get away with that in a kids' show?!" chart. Especially given the sounds we sometimes hear.
The destruction of NOS-4-A2 in Buzz Lightyear of Star Command. In just a few scenes his left arm is blown off in an explosion, and he is shortly grabbed by the werewolf Ty Parsec, who growls at him before throwing him. We then see him, graphically impaled on a metal spike, thrash around and scream before exploding into pieces. The only way Disney could have been able to get away with this would be because he was a robot and not a living creature.
Captain N: The Game Master. An episode, in the world of Tetris, a rather non-violent game with no enemies whatsoever, implied that many of the oddly shaped bricks that made up the wall were in fact former people. Kevin and the group were captured and threatened with being turned into bricks and forced to stay trapped as part of the wall forever, complete with a visual of what that might look like. This seems to be a reference to a Howard & Nestercomic introducing Tetris that featured the exact same plot.
Courage the Cowardly Dog: "King Ramses' Curse". The titular King Ramses is a very gaunt and oddly animated figure with three curses. Two were mostly harmless, but the third was swarms of locust that quickly devour anything and anyone, including Eustace and two anthropomorphic cats.
Also, the death of Danny's clone — the disintegrating flesh, the sad, trapped look, the arm reaching out to his "father", the mouth opening slightly...
Defenders of the Earth is a bit infamous for having some notably gruesome death scenes. The show's Big Bad, Ming the Merciless, is killed off in the beginning of a five-part arc (he got better) and his death scene sees him get vaporized into ash. One villain, Doctor Dark, seems to suffer a Disney Villain Death by falling, but the end of the episode reveals he's still alive and in the fall caused him to lose an eye and get half his face horribly disfigured; when he returns in a later episode he's Killed Off for Real after dissolving into a skeleton.
In The First Bad Man, in a scene that is often cut from television, the villain Dinosaur Dan during one of his robberies walks up to a shaggy haired caveman, pulls up his beard like a curtain, and shoots him in the head at point blank range with a non-bloody hole through his head and he falls over dead.
Generator Rex has quite a few, and we aren't talking just Mecha-Mooks or EVOs. Most onscreen deaths are Providencesoldiers fighting alongside the main characters. You know things are tough when in the very first episode you see crashed dropships and the bodies of the Providence operatives that were sent to save Rex from Van Kleiss. The show seems to be making a game of killing off said Red Shirts in the most brutal ways possible in a kids cartoon. Highlights include a soldier falling into EVO-piranha infested water, and screaming before being dragged under. The show once even managed to avoid Bloodless Carnage; although it happened with a swarm of giant insects, the blood splatter they exploded into was red.
G.I. Joe: Renegades manages a few. Ripcord makes a Heroic Sacrifice early on, Maj. Hidalgo gets vaporized into a pile of ashes by Baroness when he tries to extort more money out of her, and Cobra Commander feeds a pesky mole to his giant pet snake.
In Help! I'm a Fish, the villain is finally tricked into turning himself from a fish into a full human being... underwater. There are no cuts and no convenient camera angles. He drowns in real time, center frame.
In one cartoon the cat catches several mice, ties them to a stick, and starts roasting them alive with an expression of sadistic glee. The cat and the mice were Funny Animals of the most human-like sort.
In the Christmas episode the supposedly heroic mice kill the apparently evil cat, turning his corpse (you can tell he died as he makes no movements, not even blinking) into a Christmas tree, plugging his tail into a electric socket, all while Christmas carols play. There's a reason these characters were the inspiration for The Itchy & Scratchy Show.
A lot of the Famous Studios/Harvey Toons cartoons have this kind of carnage. Baby Huey was regularly assaulted by foxes and other predators with fire axes and the like; his indestructibility doesn't make the scenes any less traumatic.
One cartoon ("A Bicep Built for Two") has Katnip being pursued by a giant body builder cat who stole his girlfriend, in the end Katnip uses two shotputs he'd been using as biceps to smash the bully's skull which kills him because his 9 lives come out. There was no blood, though.
An unaired House of Mouse short featured a scene where Minnie Mouse buries Pluto alive in a nightmare his conscience created while he is forced to stay at Minnie's house while his owner Mickey is on vacation. Toward the end of the short Pluto is dragged to Hell by the same conscience!
In the sixth episode of Inhumanoids, we meet a Dr. Mengele Expy named Herman Mangler. He falls into a toxic waste dump, and we see his body liquefying as he screams "It's eating my flesh!" before he sinks under the water. That is the last we see of him that episode. In the next episode, his ally drains the swamp and retrieves Mangler's corroded, worm-eaten skull. This was on a Saturday morning cartoon, from Sunbow Entertainment, the studio that produced My Little Pony 'n Friends the same year.
Johnny Test has the infamous episode "Johnny's Royal Flush" in which Johnny is turned into a fish, flushed down the toilet, and pursued by a hungry Sewer Gator, that is sucked into what is essentially a giant fan, ripped apart and turned into shoes and bags. And we're supposed to find this funny. Not to mention Johnny (who helped the villains to escape from a horrible fate) leaving the alligator to die violently. The Mysterious Mr. Enter pointed that out in his review for that episode.
In one episode the villain was impaled on elephant bones (Gory Discretion Shot used, obviously, but everyone winces and it's not a large leap to imagine what they saw). Another villain was shot to death with a machine gun.
"Undersea Urgency", in which an undersea lab is attacked by what can only be described as sabertoothed C.H.U.Ds. As the survivors of the attack are making their way to escape pods, one lady scientist stops to try and grab the body of one of the dead creatures "for future study" (with the entire group yelling at her not to go near it). Whoops! Not Quite Dead. The scene cuts to a Gory Discretion Shot, but the clear implication is that the creature bit the woman's face off.
In the same episode, creatures like dog-sized piranhas with legs got onto the submarine after eating a whale to nothing but bones onscreen, and in one scene while they were running for their lives from the creatures, a female scientist was too slow, and we got a shot of the creatures swarming her as Race was forced to slam the door shut to prevent them from getting to the rest of them all, and you hear the woman being graphically devoured, complete with squelchy crunching sounds.
"More Than Zero", the last episode of the Real Adventures series ever produced. While investigating a haunted house, two scientists get thrown into a room with the walls rapidly closing in on them. And, unlike most situations like that on the show, they die horribly offscreen. Not to mention the Lovecraftian appearance of the ghost itself and the caretaker dissolving into dust at the end.
In the movie Jonny's Golden Quest, Dr. Zin betrays a scientist named Dr. Devlin who had come to work for him by blasting him with a laser cannon, causing Dr. Devlin's skin to melt off until he's a charred black skeleton and crumbles to ash while screaming in agony the whole time!
The episode in which Race and the boys faced off against a man who had a literal shadow puppet monster which had already killed several, and could reach them anywhere, at any time, and couldn't be killed since it was just a shadow, so they couldn't shoot it or capture it. Logically, they thought that if they turned out the lights, it would cease to exist. They were wrong-all that did was make the monster invisible!
In the episode "Big Bro Po" there is a very horrific sequence where Bian's father, Taotie, got in his Humongous Mecha and crushed Po to death. At the end of the carnage, Po is shown, dead, on a table, with an apple in his mouth. Taotie then tells Bian that they are going to eat him. At least it wasn't real...
In the one-hour special "Enter the Dragon", Po is crushed to death inside of a giant funnel. And this wasnota dream.
Many cartoons, especially ones directed by Tex Avery and Bob Clampett, feature characters committing suicide by shooting themselves in the head; there was no blood though. However, Clampett's original cut of "Hare Ribbin'" took this trope Up to Eleven when, instead of Bugs giving a gun to a dog to kill himself, he pulls out the gun and shoots the dog in the mouth. Understandably, the Hays Office wasn't pleased with this ending.
In a MGM cartoon titled "Wild and Woolfy", in one scene the wolf villain comes across his old friend Slim, whom he hasn't seen in years. He greets him by shooting him — at point blank range — in the face, and we see his corpse fall over dead.
The Ghost of Christmas Future sequence in Mickey's Christmas Carol. Yes, A Christmas Carol is supposed to be scary at times, but here, Scrooge (McDuck, in this case) is pushed into his own grave by the Ghost of Christmas Future (played by Pete, cruelly laughing the whole time while taunting "Richest man in the cemetery!"), into a coffin belching hellfire and brimstone.
In Once Upon a Time (an adaptation of the fairy tale "Frau Holle"), the evil stepsister Trapped in Another World passes by an oven filled with animal-shaped cookies that want to be let out. The stepsister refuses to do so, and the animals then burn to death while screaming in agony.
The Regular Show episode "Fists of Justice" featured one of the giant baby guardians of youth impaled through the chest with a mace-rattle, with a bloody gaping hole in the chest for good measure.
In the episode "Sandwich of Death" the Master Sensei dies after being force-fed the Double Death Sandwich.
Not to mention the guards who died trying to prevent the heroes from reaching Master Sensei in the first place.
Samurai Jack was notorious for using the Mecha-Mooks loophole to depict scenes of violence that, had the recipients been humanoid, would qualify as Gorn. Backgrounds of dead robots with close-to-human anatomies liberally distributed and oileverywhere are common, and every few episodes the titular character will be sprayed with veritable fountains of oil as he mercilessly hacks robots apart. Added to this is a heavy implication that many, if not all, or these robots are completely sentient, just in case you weren't feeling uncomfortable enough.
One particular episode focused on a robot that had developed a personality, and actually cared about a puppy. The puppy gets held hostage so the robot will fight Jack. It gets cut down in seconds, just like all the others.
Another episode had a starving family come to Jack looking for food. However, they only eat metal, and think his sword would make a tasty treat. It's only after Jack slices off the face of one of them that they're revealed to be robots disguised as humans, at which point they begin tearing themselves apart and eating each other. Made all the more disturbing by having the red tinted metal under their disguises.
The death of the cat people in the otherwise pretty tame Scooby-Doo on Zombie Island: They disintegrate horrifically, and you can actually see bone fragments. And in the flashback, when the pirates force the villagers into crocodile infested waters... their deaths occur offscreen, but you still hear the screams and other horrible sounds, as the camera shows the horrified faces of the two girls that survived because they hid behind a tree.
The 1981 Spider-Man and His Amazing Friends cartoon depicted Doctor Doom as both looking and sounding remarkably like a robot — more particularly, Darth Vader — which may explain why, in his final appearance, robot or not, he is slowly vaporized by his own laser and dies screaming.
SpongeBob SquarePants: In "To Love A Patty" Spongebob grabs some clams and smashes them into little pieces while still alive. The worst is when he holds one in the air for a few seconds before snapping its jaws and breaking the shell in half. You can see that one's tongue fly off.
Durge surrounds and absorbs Obi-Wan, much like Clayface mentioned above. Then Obi-Wan uses the Force to explode Durge from the inside out, scattering bits of him all over the room. Durge is shown in a later shot to be Not Quite Dead, but still, that's not pleasant.
Grievous' debut in the second season has him murder his way through dozens of clones and senate guards, crushing them and slicing them up. Most of it takes place off screen, but the sounds are gruesome enough.
Grievous graphically killed an alien mechanic/hacker with the lightsaber blade visibly tearing through his chest!
When Barriss Offee is being attacked by a mind-controlled clone, she takes out her lightsaber and guts him, with a close-up of the sword impacting the clone.
They really turned it up to eleven with flamethrowers being used on Geonosians by the clones. They burn and scream the whole scene and some of them got especially lucky with being sliced in vertical halves by the Jedi.
During an escape scene in "Counter Attack", a clone dies in a rather horrible way: being cut in half by a vent's security doors, thankfully blocked out by a convenient door closing just prior.
Even Piell in the same trilogy gets mauled by an alien hyena-wolf-thing. Though they skipped on showing the wounds he should have had, it is quite clear that it nearly tore out his throat.
Riff Tamson got blown to bits, with his severed head shown on screen. He also uses his explosive knives on multiple Republic fighters, and they also scream as they die.
Cad Bane is the guy who manages to get away with gangland style, on-screen executions in a children's show. In his first appearance in the show, Cad Bane snaps a guard's neck.
In "Bounty", Dengar kills two Kage Warriors by sticking remote explosives to their chests and detonating them; only the camera angle saves the viewers from the Ludicrous Gibs that could have been. And later, Krismo Sodi takes out Major Rigosso with an electrified sword through the gut.
In "Eminence", Savage Opress decapitates a room full of Black Sun vigos when they refuse to side with Darth Maul.
In "Shades of Reason", Darth Maul decapitates Pre Vizsla in a blatant execution.
In "Revival" Savage Opress rams Adi Gallia with his head, stabbing her chest with his horns before delivering the death blow with his lightsaber.
In "Carnage of Krell," not only does Waxer have tearful last words, but Krell suddenly stops using his lightsabers on the clones and breaks a clone's back over his knee. At the end, Dogma executes Krell onscreen.
The genetically identical clone troopers are given screentime to establish personalities and likeableness, and are still killed off. Notable examples include two naval officers being sucked into vacuum by having their escape pod cut open, Sergeant O'Niner's execution, and Cutup's being eaten by a giant eel.
Trandoshan scavenger Gha Nackht is stabbed through the chest by Grievous after capturing R2-D2; ditto for traitor Senate Commando Captain Argyus (although to be fair, he did mouth off to Asajj Ventress).
Pirate Turk Falso was Force Choked by Dooku to death onscreen.
The Rodian Jedi being tortured to death on screen by Cad Bane and the battle droids. When he finally dies, the droid operating the controls announces it in such a disturbing tone of depression in comparison to their usually high-pitched voices, you can't help but shiver.
A bomber commits suicide rather than be captured by jumping to his death from a balcony.
In one episode, the enemy general had the local villages bombed instead of the clone troopers. They were full of civilians, children even.
In "Monster", Asajj Ventress travels to the far side of Dathomir, where she holds incredibly violent contests to determine which Nightbrother clan representative should receive Sith alchemical augmentation and serve as her spy against Count Dooku.
She does this by bringing the candidates to an arena, dimming the area lights and systematically murdering all but two of them with a scythe on a chain and their own weapons.
Asajj clearly decapitates at least two while laughing maniacally, and when another throws a spear at her, she grabs it in midair only to whip it quite visibly into the chest of another man.
Then, after Ventress has selected Savage and brought him back to the Nightsisters to be imbued with their power, the "coven" tests his loyalty—commanding Savage to kill the only other survivor of the games, a man heavily implied to be Savage's blood brother. Savage does so, with a Neck Lift and the customary follow-up.
In the Zygerrian Arc, the prison warden lords over Obi-Wan that, as a Jedi, it's against their code of honor to kill an unarmed opponent, even one as sadistic and evil as him. Captain Rex notes that clone troopers have no such rule and proceeds to throw an electrostaff clean through him, his hoverchair loses control and veers into the nearby console, letting the electrocutions finish off what the impalement started. This probably wouldn't have slipped through the censors if the warden wasn't such a utterly evil bastard.
Steven Universe has one of these in the episode "Off Colors". In an attempt to save the Off Colors from a robonoid, Lars leaps on top of it and starts beating it with a pointed rock. As the robonoid tries to throw him off, he gets so fed up he stabs the sharp end of the rock into the robonoid's "eye", causing it to explode in mid-air. Lars is slammed against a cliff face, falls thirty feet to the ground, hits a rock, bounces back and finally rolls into a ditch. After his revival he sports a nasty scar over his right eye (which was obscured by his hair), indicating he took shrapnel to the face as well.
"The Late Mr. Kent" shows two scenes of a gas chamber execution. The first is of an innocent man accused of a crime, in which they show him desperately trying to keep his face away from the inrushing gas until Superman breaks in to save him, then in the very last seconds of the episode, as the corrupt cop really responsible awaits his death, he figures out how Clark Kent, who he tried to kill for finding out the truth, was able to survive. Then the scene immediately cuts to the executioner's hand pushing the switch over, and fades out.
After Dan Turpin frees Superman, and the timely arrival of the forces of New Genesis, Darkseid is forced to withdraw, but not without firing one final Omega Beam, which streaks toward Superman before curving around and instantly vaporizes Turpin.
Mala and Jax-Ur go out by getting sucked into a black hole. This would perhaps be acceptable, except that, well...
In "The Giant Bacteria," Morbulus is turned into the eponymous bacteria monster, who later divides into three separate monsters, each of which is electrocuted to death by the end of the episode, convulsing hideously before either exploding or melting into lifeless brown glop. This technically means he dies three times!
In "The Metallikats," Mac Mange shoots Katscratch with his laser gun, launching him across the room and smashing him into a stack of crates, which collapse onto him. He is visibly shown to burn up in midair, and a close up of his burned, smoking hand is seen.
In "Bride of the Pastmaster," an oil-eating sea monster has a "Match Head Missile" fired down its throat. When the missile hits the oil in its stomach, the creature blows up from the inside out, and parts of its flesh, as well as a lot of oil, splatter all over the Turbokat.
In the same episode we see two cyclopes fall off of a cliff. The second one gets a Sound-Only Death as he plummets out of sight, but the first one we get to see actually fall all the way down and hit the bottom. We also see the clay figurine representing him back in the Pastmaster's tower explode, just to hammer home how dead he is.
The two "harpies" (what the model sheets call the little dragons) in that episode are accidentally hit by the bigger dragon's fire breath and burn away to ashes fully onscreen.
The dragon himself is killed with the mystical Dragon Sword, which has been tied to a missile. This one sort of straddles the line. Although the dragon's death is depicted as simply him disappearing in a bright flash of light (complete with a Big "NO!" from the Pastmaster), the fact they show the sword's blade piercing him onscreen is pretty violent, even if there's no blood.
In "Chaos in Crystal," Warden Meece is turned into crystal and a few moments later knocked over, shattering into pieces all over the floor. He's the only crystallized character not shown turning back to normal at the end when the SWAT Kats reverse everything - the result of that would've been quite nasty.
In "The Ci-Kat-A," the death of the alien queen is pretty gross. A section of burning rooftop falls on her, crushing her fully onscreen and splattering her into gooey chunks of green slime - which splatters all over Mayor Manx, Mr. Young and their chauffeur.
In "The Deadly Pyramid," the Pastmaster's "mummy commandos" horrifically melt into purple sludge whenever their visors are shattered, allowing sunlight to shine into their eyes. Katchu Pichu also melts when Razor smashes the Pastmaster's crown, which he was using to control the mummies.
In the same episode, the Pastmaster gets dropped into lava as the pyramid around him collapses, complete with another Big "NO!" (which is kind of his thing). We see him splash into the molten rock and go under.
In "Volcanus Erupts!", the title monster, a huge fire demon, has a bomb stuck on him. When it goes off, he is violently exploded into several fiery chunks, and his severed hand (clutching Razor) flies through the air and lands in the ocean.
Octus getting impaled by an electric-energy Mutraddi.
Although it doesn't kill him, what happens to Baxter Stockman in the original Teenage Mutant Ninja Turtles cartoon definitely was a bit more violent than your average 80's program. Krang decides he's expendable and attempts to kill him by tossing him inside the Technodrome's disintegration unit, and as it activates we see Baxter's skin disappear leaving him as nothing but a skeleton even as he continues screaming the entire time. Again, he ultimately lives since a fly happens to fly inside it as well causing their DNA to merge, but you have to think about what the device would have done if the flyhadn'tbeen inside it at the time....
Graphic train wrecks aside, the cast of Thomas the Tank Engine is pretty much guaranteed Contractual Immortality... except for the Spiteful Brakevan that Douglas smashed into matchsticks. And S.C. Ruffy, the Troublesome Truck leader that Oliver pulled apart. And by implication only, the engines that were actually scrapped - a few scenes have carcasses of 'dead' engines in the background.
Beast Wars is a very violent show, exploiting the Mecha-Mooks loophole as far as it can. Characters are bashed up, blown apart, shot, stabbed... and usually alive in the next episode. When someone actually dies, it tends to go even further: Tarantulas was vaporized by one of his own mad science devices, leaving nothing but his feet with smoke rising from them. The last we see of Terrorsaur is his desperately outstretched hand slowly descending into the lava. And we'll spare you the details of Depth Charge, Rampage, and Tigerhawk's deaths, to say nothing of Dinobot's and Transmutate's heart-wrenching deaths. And Megatron shoots Optimus Prime in the head. He got better, but still, giant gaping hole in the head of one of the biggest adored heroes of a generation.
Transformers Animated: Blurr gets trapped in a tunnel and crushed by its closing walls. After which his killer (in disguise) casually hands his cube-sized remains over to the nearest Autobot who has no idea what he was told to toss down the disposal chute. Considering the show had no "real" deaths up until this point, this made the emotional impact even worse. The comics later reveal Cliffjumper kept putting off throwing out the cube, meaning Blurr stayed alive in a crushed-up cube for who knows how long. Sari eventually helps him recover, but not until after sitting helpless and silent for months.
Cliffjumper's death at the servos of Starscream happens a few minutes into the first episode, achieved via 'Scream jamming his claws through his chest, followed by his poor victim visibly bleeding out energon with a look of utter shock on his face.
Bulkhead dispatches a Vehicon by essentially yanking its robo-guts out with his bare hands.
A later episode has Tailgate, an old partner of Arcee's, being sliced open by Airachnid causing energon to splatter everywhere. That one probably only got by because they used a Gory Discretion Shot.
Breakdown's death at the hands of Airachnid. She lures him into a trap, and then proceeds to slice him up. Then the remains get collected by MECH...
Insecticons always seem to be on the receiving end of one of these. One is covered in Scraplets (what are basically Cybertronian army ants) and falls into a chasm while its limbs come apart, another gets into a brutal fight with Megatron, which ends with two of its limbs being torn off before decapitation, and yet another gets toxic shrapnel in its torso after an explosion, causing it to writhe in agony before dying.
Dreadwing's death. He gets a giant hole blown through his torso, with disturbingly little emotion on the part of his killer.
Megatron dies when a giant sword is stabbed through his chest. It's left in his torso for roughly a minute as we see the light fade from his eyes. Too add salt on the wound, he falls from orbit and ends up burning up in the atmosphere.
"Revelation" contains a scene where Joker gas is released from a giant plant, gassing three firefighters who fall down and die onscreen. They probably got away with this because it's only later stated that Joker gas kills people.
In "Failsafe", the alien invaders disintegrate numerous civilians, the entire Justice League, and half the main cast on screen.
Season 2 had one early on when Aqualad stabs Artemis in the chest with a clear bloodstain. It's faked though.
The late season episode "Summit" had Deathstroke shoot Aqualad and Artemis in the chest. While you only hear the gunshots and them falling down, you can clearly see the bloodstained bodies shortly afterwards. This is also faked. They get up and start walking and talking again, with convincing blood on their chest. The same episode also has Ra's Al Ghul stabbed in the back with the blade coming out of his chest. This is Ra's al Ghul we're talking about, however.