Originally Answered: In the MCU, is Thor bullet proof? Yes. He resisted gunfire from the Quinjet in Age of Ultron.
Thor is bulletproof in the comics. So really, absolutely nothing unless those bullets happens to be made of vibranium or pure adamantium.
Bullets don't affect them as much as they hurt humans, but Asgardians are not bulletproof. They just have really good armor.
Within the MCU, they have established Thor as an immortal, making him an invaluable member of the Avengers and one of the most powerful beings to ever exist. As a result he can be killed in battle, but he will always return to his body one way or another.
Nothing. Absolutely nothing will happen to him. He is very strong for that. He has been hit with more powerful things than that in comics and movies alike.
Fat Thor's mental state is what prevented him from doing the Snap. It's not just Thor's durability, but he needs to be stable enough to do it right. Could he have survived the energy surge long enough to snap his fingers? At least in his current condition, no.
Thor is repeatedly vanquished by the 5 new Phoenix hosts over the course of 12 issues: Colossus, Namor, Cyclops, Magik, and Emma Frost. Colossus even manages to knock Mjolnir out of Thor's hands at one point, demonstrating the strength of Phoenix and why it should not be trifled with.
Because of the thickness and strength of the Hulk's skin, it's nearly impossible for any form of artillery to hurt him. Sure, everyone's seen bullets bounce off of the Hulk, but when we say he's bulletproof what we really mean is he's BULLETPROOF.
God Of War Ragnarok: Thor's Wound Festers Because Of Jormungandr's Venom. The reason behind Thor's incurable wound is due to the Eitr imbued in the Leviathan Axe.
Superhuman Stamina: His stamina is almost limitless. Thor survives the Time Stone of time. While still aging physically, he retains his youthful appearance far longer than humans, barely changed after Thanos used the Time Stone to age by several centuries, and will only grow stronger the older he gets.
Thor's toughness comes in when he continues to survive with little to no lasting harm, despite having been stabbed by Loki repeatedly since they were children. Because Thor is unlikely to die from it, stabbing him is basically a brotherly prank as far as Loki is concerned.
Thanos has shown many times that he is far beyond bullet proof. You see bucky unload an M249 at near point blank range, these bullets seem to do nothing more then annoy him. Falcon also unloads his twin pistols at thanos, which seem to do little more then bounce off him.
Instead of aliens, androids, and wizards, Thanos is afraid of aliens, Asgardians, and wizards.
No, Thor could not survive a Nuke attack.
Absolutely yes. In fact, there are quite a few misconceptions about Thor's abilities. Even Thor himself was unaware in Marvel's Thor: Ragnarok film.
Hafthor Björnsson, also known as Thor or The Mountain or that incredibly strong man from Game of Thrones, just broke the world record for deadlifting more than any human in history. The strongman and actor was able to deadlift 501 kilograms, or an astonishing 1,104 pounds.
He was rendered unworthy, because in his heart he believed what Fury said was true. In effect, Thor knew “how it feels to be mortal” and in his mind mortals are unworthy of Mjolnir and the powers of Thor. It's important to note here that Thor's unworthiness was of his own design.
Worthy Warrior and Weaponry
Thor, son of Gods, has enhanced longevity, augmented by the Golden Apples of Idunn. He also possesses superhuman strength, speed, agility, durability and immunity to most diseases.
Invulnerability. Being an Asgardian/Elder God hybrid (akin to that of a demigod), Thor has been granted immunity to all of Earth's diseases and infirmities, as well as extreme heat and subzero temperatures. In addition to his immunity, Thor is virtually invulnerable.
Great Power. Like his namesake, Spider-Man's strength and agility stand far above those of the average human, allowing him to lift nearly ten tons and to leap and move at incredible speeds with high accuracy.
Warning: contains spoilers for Devil's Reign: Spider-Man #1! Marvel fans know that Spider-Man is a strong superhero, but the company has just confirmed that Peter Parker is strong enough to defeat the Incredible Hulk in a one-on-one brawl.
How high that strength level rises would vary in different comic books, but most classify Thor in the “Class-100” strength category, which means he can lift well over 100 tons without too much difficulty.
In his quest to kill all gods, Gorr attacks Thor and steals his axe Stormbreaker to reach Eternity, despite the Necrosword slowly killing him.
Hercules / Zeus
He ranks above Thor here because he's technically the stronger of the two. In fact, he is considered by many authorities to be the physically strongest character Marvel has ever created.
Odin. Odin is basically Thor and all the other Asgardians rolled into one—though he's even wiser, more experienced, and minus one eye. As the default King of Asgard, Odin is easily the most powerful being in his realm.