Nigh Invulnerability/Web Comics

Examples of in  include:

"Bun-bun: Oh, sure. It's really easy to be "tough" when you're totally invulnerable. Sounds more like a petty hole to me."
 * The Werewolves in Cry Havoc survive A LOT of automatic weapons fire. Skoll shrugs off rifle, machine gun, grenade launcher, and cannon rounds all durring one charge.
 * In Yosh!, Phil takes advantage of this in odd ways, like falling multiple stories because it's faster than the stairs.
 * One issue of Girl Genius involved a circus group being attacked by a horse-like monster. Attempts to blast it with various steampunk guns, unleash a swarm of poisonous bugs and a robot with buzzsaw, they barely even scratch it. Finally Zeetha managed to chop its head off... only to find out it has a second mouth starting at the base of the neck. Luckily Agatha already built a big lighting gun capable of reducing the monster to ashes.
 * It would appear to be part of sparkiness as well. It's never explained precisely how Othar manages to survive all of his he-should-be-dead experiences.
 * The necromancer Helixa in Dominic Deegan, Oracle For Hire had such control over death with her magic that any attempt to kill her caused her to resurrect where she wished. Klo Tark attempted to get around this with an attack that paralyzed her for three hours before killing her, which would ensure she was there to interrogate when he was done with the current crisis; she bit through her tongue and choked on her blood to escape. After that one, though, she ended up Deader Than Dead. Miranda Deegan, her old rival, killed her with an angelic gauntlet; its magics canceled Helixa's necromancy, and Helixa was thus Killed Off for Real. And for good measure her soul was destroyed during the "War in Hell" arc.
 * The same War in Hell introduced Sirellith, the Demon Lady of Treachery, who could "betray death" and come back from the dead. The only way to kill her for real was to "use her treachery against her" and kill her with part of her own body; Karnak did so by snapping a horn off of her and stabbing her with it.
 * A more comical version of the constant regeneration type is Ran Cossack of Bob and George. He was made out of cheap Soviet parts, so he dies from even light physical contact, but the parts were so cheap a new body with a copy of his memories would just instantly be built and teleported back. He is effectively immortal as long as they don't destroy the production machine (as he puts it "You can kill me, but you can't stop me"). The only way to defend from this is to block the teleportation with a shield. He also gets a powerful but unstable weapon that always kills him, but it can be stolen from him to make an infinite number from his respawning, and also makes him a powerful explosive or "Ran-bomb".
 * In addition, though Ran himself dies easily, a wall of his corpses can withstand just about anything.
 * Amorphs in Schlock Mercenary are classic Blobs, with some impressive (if rather disturbing) regenerative abilities. Schlock himself has not only recovered from being blown up, poured down drains, sliced into pieces splattered into droplets, but in one case, immediately returned to the fight after stopping for a quick bite of minced comrade-in-arms (I told you it was disturbing - don't worry, he saved their heads for later recovery) to gain enough extra mass to beat the creatures which did it to him in the first place.
 * There are also the Peteys, a massive Hive Mind comprised of a mix of A.I. and organic bodies. At one point, Petey (along with the rest of the Fleetmind) ponders the fact that despite this, they aren't quite immortal - yet.
 * Petey has also been working on a way to grant immortality to some of his favorite organics using Nanomachines that not only repair the body from everything incuding most forms of death, but can morph their benificiary into an armored Super Soldier form when needed.
 * In Order of the Stick the evil lich Xykon can regenerate from his philo... phylia... soul hidey place (phylactery) as long as it is kept intact.
 * The Monster in the Darkness as well. When Miko attacks him, he complains that it tickles. Later, he doesn't even notice when Belkar attacks him.
 * Nesuko of The Adventures of Boschen and Nesuko eventually proves to have the regenerative version of this power, taken to its logical conclusion- her severed limbs and organs try to grow back new bodies.
 * Sluggy Freelance villains provide a number of examples:
 * Satan's kittens - Made of Diamond, not showing any signs of damage after taking grenades and shotgun blasts at point blank range.
 * K'Z'K - When possessing Gwynn he was a regenerator, able to pull himself together even after being run through a meat grinder. After assuming his true form he is Made of Diamond; since we never see anything hurt him in this form, we can't be sure whether he retains his regeneration.
 * Lord Horribus - Can only be killed through decapitation or stabbing the very center of his soul with an enchanted weapon. In fact, most demons are Made of Diamond, enough so that swords clang harmlessly off their skin.
 * Evil Aylee - Her head and her shell are Made of Diamond, with her (retractable) neck her only vulnerable point.
 * Oasis and Kusari - Resurrection. They've been blown up, shot through the head, decapitated, stabbed through the chest, and confirmed dead by medical proffesionals, but they always come back, completely uninjured. How they do this is one of the series's big mysteries. They also heal extremely well while alive.
 * Vampires - Depends on type, and some have pretty serious Kryptonite Factors, but they seem to be able to regenerate all damage (up to and including having their brains eaten) unless it's inflicted in the one right way.
 * Dr. Crabtree - Her body thoroughly infused with nanites, she's probably able to survive and heal from just about anything, though it sometimes takes a while for the repair nanites to start running.
 * This same technology extends to everyone in.
 * Alien Christmas elves and Santa - Taken over by parasitic alien DNA and turned into hybrid monsters, the elves—and Santa doubly so—were tough enough to be Immune to Bullets and all conventional weapons short of heavy explosives. They were still vulnerable to nerf, and it didn't keep Bun-bun from beating one up until it was begging for mercy.
 * Lodoze. Comes with a bit of Bun-bun's commentary:

"Bleen 1: Wait, what happens if we hit one of them with one of them? Bleen 2: Same as shooting them... only you get sparks."
 * The Wom Wom Coconut in The Egregious Adventures of the Wom Wom Coconut suffers many deaths. The hit invariably turns out to have been taken by a member of the Stunt Nut Corps, a numberless horde of coconuts identical to each other and the hero. Both the coconut and the coconut's arch-rival, Space Durian, are capable of instant reincarnation. Death is shrugged off in the same panel it occurs in.
 * The Mows of Dan and Mab's Furry Adventures are completely invincible. They're immune to magic, can't be harmed physically, and are too stupid (IQ: 3) for psychic attacks to have any effect. Oh, and they're adorable. Mows are basically furry Servbots.
 * The fae also seem to be invincible. If in-comic information is trustworthy, they can only die when they choose to.
 * Lampshaded in Everyday Heroes when Mr. Mighty and Matt O'Morph get into a Brick vs. Blob sparring match.
 * Grace in El Goonish Shive is a Tyke Bomb Super Soldier. Her fur is fireproof by design and she seems to be moderately annoyed by impacts that could break half of the bones in a human (given the speed with which she runs and jumps, this may fall under Required Secondary Powers). The regenerative powers are more of an Informed Attribute since Grace has barely been touched by anyone.
 * Like his totally not based off counterpart, Captain Broadband appears to be very difficult to damage, surviving falls out of planes, hordes of attacking fans and setting off his own bomb by punching it!
 * The golem girls in Wapsi Square are of the made of diamond variety. They are implied to be able to survive even complete planetary destruction.
 * Monica has a touch as well; after accidentally teleporting into a gunrunners hideout, they made with the More Dakka, and she survived unscathed, with only Clothing Damage to show for it. One character postulated the extreme luck form of this, and another suspected she was (unwittingly) teleporting the bullets away as soon as they touched her skin.
 * Vexxarr has rock crabs. It's not that nothing can harm them - there are silicon predators, for one - but not a whole lot. Generally attempts to harm them end up as a predictable exercise in futility. Once a bunch of these creatures were fired from mass-driver at a Bleen ship, breached the hull and then were shot by the crew point-blank, with several recharges of their weapons. The latter somewhat affected them, in that this was "nutritious" enough to make them sleepy. Walking around the active zone of an overheating nuclear reactor made Sid grow by absorbing materials of environment, but even this didn't stick - he merely had to excrete some diamonds later.


 * Magick Chicks has a lot of tough people - Chastity was knocked out by flying head-first into a tree in a training fight and Tandi was blasted into wall (when she managed to seriously upset Melissa) so hard she cracked the tiles, and ended up merely groggy. But the real star is . So far, and only on-screen, she was subjected to: impaling through the chest with a sword (which happens to be some notorious artefact), blasting almost half of her skull off with an antique pistol (also clearly magical) point blank and twisting her neck so far she faced the opposite direction. She invariably springs back in a few seconds, and only moderately annoyed. Then again, we know she lived through more unpleasant (if less fatal) things.