Cang Du (Bleach) lives up to his epithet, "I - The Iron", turning his skin into impenetrable iron.
Nnoitra Gilga (Bleach) using Hierro to pressurize his spiritual energy onto his skin, turning it iron hard.
A Quincy (Bleach) such as Ichigo using Blut Vene to flow spiritual energy into their bloodstream, turning it inhumanly hard.
Saitama's (One-Punch Man) superhuman durability allows him to withstand a punch from the Sea King to his head with only a flinch.
Gremmy Thoumeaux (Bleach) using "V - The Visionary" to imagine his body hardening to stronger-than-steel.
Kenpachi Zaraki (Bleach) possesses tremendous durability, his immense spiritual pressure acting as an armor of sorts. Even Ichigo's hands got injured in a backlash without harming Zaraki.
Baraggan Lousenbairn's (Bleach) Resurrección grants him tremendously resilience, allowing him to survive Suì-Fēng's Jakuhō Raikōben's massive explosion at point blank range.
Ryūichi Sendō (Code:Breaker) transforming his skin into steel, increasing his defense and offense.
Skinn Bolic (D.Gray-Man) possesses an incredibly strong layer of skin composed of solidified lightning.
After assuming his Legendary Super Saiyan form, Broly (Dragon Ball Z) reinforces his body with tremendous ki to the point where he is completely unaffected by Super Saiyan Gohan's punch.
Torafusa (Fairy Tail) can alter the density of his skin that can not only stop Gajeel's magical iron but break it as well.
The Captain (Hellsing)'s tissues are hard enough that he can catch Walter's Wires in his hands, even though they can cut through whole skyscrapers.
Tōkajin (InuYasha) implanted Shikon shards into his body, turning it into an armor of stone.
Unruly A (Naruto) inherited his father's near indestructible body, though a lower level in comparison.
Kakuzu (Naruto) using Earth Spear to transform his skin into a harder-than-steel material that is near impossible to penetrate, aside from Lightning.
The Third Raikage (Naruto) possesses a near indestructible body even without his Lightning Release Armor.
Blueno (One Piece) has been trained in Rokushiki - Tekkai since childhood, allowing him to make his entire body as dense as an iron carapace, causing Tilestone's hammer to shatter upon recoil impact.
Tony Tony Chopper's (One Piece) Monster Point possesses a tremendously hardened body to the point where superhuman attacks like Rankyaku and Shigan simply bounce off of him.
Bobby Funk (One Piece) was born with a very powerful body, where even a Busoshoku Haki imbued axe snapped when it struck him.
Jozu (One Piece) can assume a diamond form, hardening it further by using Busoshoku Haki.
Charlotte Linlin (One Piece) tremendously tough physique makes her completely immune to bullets and cannonballs...
...or being electrocuted by a tremendous lightning bolt.
Luffy (One Piece) using Busoshoku Haki to harden his body to incredible levels.
Escavalier (Pokémon) possesses a steel-hard carapace naturally, and uses Iron Defense to further harden its armor-like defense.
Tetsuhito Kagiroi (Tenjho Tenge) possesses an iron-hard body due to his clan's women drinking iron sand every night.
Yaya (Unbreakable Machine Doll) can harden any aspect of her body, even if they are not attached to her at the time, rendering her invulnerable to physical attacks.
Gatasubal (Yu Yu Hakusho) is composed entirely of a hybrid metal of combined steel and living cells, making it very difficult to pierce through it.
The Gray Hulk (Marvel Comics)
Crazy Machine (TF2 Freak)
Destroyer's (TF2 Freak) durability is enough to survive a blow from a HECU Tank, resist sizable explosions, most powers, etc.
Golem (TF2 Freak) can withstand heavy firearms, blunt trauma, etc without getting hurt.
Being a Necroborg, Robosol (TF2 Freak) has a supernatural level of durability, allowing him to withstand small to heavy arms fire, and resist Soldine's Thunder Punch with little injury.
Painis Vagicake (TF2 Freak) shares Painis Cupcake's supernatural level of durability.
Thanks to having heavy armour, durable limb prostheses and a reinforced skeleton, Soldine (TF2 Freak) can withstand an impressive amount of punishment until the attacks finally do some damage to him.