Kara Zor-El/Kara Danvers/Supergirl (Arrowverse/DC Comics)
Nate Heywood/Citizen Steel (Arrowverse/DC Comics)
Clark Kent/Kal-El/Superman (Arrowverse/DC Comics)
Illyria (Angel), as a demon, is naturally immune to bullets.
Ikuro Hashizawa (Baoh: The Visitor)
Ultimate Kevin (Ben 10: Ultimate Alien) possesses Humungousar, Ultimate Humungosaur, Four Arms and Ultimate Aggeregor's durability.
Gyanza Rujike (Black Cat) bulking his muscles so much that bullets simply bounce off of them.
Papillon (Busou Renkin) became invulnerable to bullets after becoming a humanoid homunculus, due to the alchemical energy flowing in his immortal body.
As a vampire, Angel (Buffy the Vampire Slayer/Angel) can be harmed by gunfire, but bullets can't actually kill him.
After being injured in a car wreck, F.B.I. Agent Baldwin P. Vess (C.O.P.S.) was outfitted with a cybernetic bulletproof torso, thus earning him the codename Bulletproof.
Augustus Freeman/Icon (DC Comics)
Kal-El/Clark Kent/Superman (DC Comics) possesses supernaturally dense tissues under the yellow sun, allowing bullets to bounce off him harmlessly.
Billy Batson/Shazam (DC Comics) is unharmed by gunfire.
Mr. Anaconda (Crayon Shin-chan) has the power of the genie, and was able to catch bullets without it so much as scratching his skin.
Ryuk the Shinigami (Death Note) is completely immune to the gunshots fired by Kiichiro Osoreda, unless he willingly allows them to affect him...
...such that he casually wrote into his Death Note as the SPK and Japanese Task Force fired at him futilely.
Though the bullets do cause him pain, Son Goku (Dragon Ball) is largely unharmed by Bulma's machine gun fire.
Tambourine (Dragon Ball) is immune to bullets from even a machine gun, as they bounce harmlessly off his ki-infused body.
King Piccolo (Dragon Ball) is immune to bullets due to his Namekian regeneration and the immense Ki flowing through his powerful body.
Having been converted into a powerful cyborg, Android 17 (Dragon Ball Z) is so powerful that a bullet simply bounces off his cheek.
Cell (Dragon Ball Z) is immune to bullets due to the regenerative abilities picked up from Piccolo's DNA and the immense ki flowing through his powerful body.
Son Gohan (Dragon Ball Z) is completely immune to bullets, to the point where he can even catch a machine gun bullet without a scratch on his hand.
Majin Buu (Dragon Ball Z) is immune to bullets due to the immense ki flowing through his powerful body.
Haze Shenron (Dragon Ball GT) had a shotgun shell bounce off of his thick hide harmlessly.
Jason Voorhees (Friday the 13th) is barely fazed by multiple bullets due to his undead nature and cellular regeneration
As Über Jason, Jason Voorhees (Friday the 13th) is completely bulletproof, futuristic bullets simply bouncing off his metal body.
Hercules (Marvel Comics) is unharmed after getting gunshot behind his head.
Bling (Marvel Comics) has diamond skin, causing bullets to bounce off her harmlessly.
Benjamin Grimm/The Thing (Marvel Comics)
The Hulk's (Marvel Comics) tough skin and muscles make him completely immune to conventional bullets.
As a Rubber Human, Monkey D. Luffy (One Piece) has a body of rubber, causing bullets to bounce back at the shooters.
Daz Bones (One Piece) possesses a body of steel blades, rendering bullets to bounce off him harmlessly.
Franky's (One Piece) cyborg body has high levels of resistance to gunfire, explosives and even cannonballs (though his back remains vulnerable)...
Hody Jones (One Piece) abused the usage of Energy Steroids, granting him a strengthened body to block bullets harmlessly.
Pekoms (One Piece) becomes immune to bullets even from a Gatling gun when he transforms into his turtle form.
...gaining further bulletproof durability while residing inside the Franky Shogun armor.
Charlotte Linlin's (One Piece) skin is near-indestructible making her completely immune to bullets and even cannon-fire.
Chaos (Sonic the Hedgehog)
Bullets simply bounce off of Evil Ryu (Street Fighter) due to the overwhelming power of the Satsui no Hado
flowing through his body.
James Heller (Prototype 2)
Thunder/Anissa Pierce (Black Lightning/DC Comics)