If it wasn't well established enough for average viewers in Thor or Thor: The Dark World, it was greatly explored in Avengers: Age of Ultron that Thor's hammer only can be held by those whom it deems worthy. So far that list includes: Thor, Odin and the android Vision; however, in the comics there have been dozens of characters who have been deemed worthy (or temporarily worthy) to use #Mjolnir.
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With all the Avengers and Guardians in one place fighting against the Titan #Thanos, it seems likely that Thor could hand Mjolnir over to one of his teammates, but which one? Here are the eight that I believe would be the most awesome!
1. Captain America
If any Avenger aside from Thor is worthy enough to yield Mjolnir it's definitely Cap, right? But why couldn't he do more than make it budge in Age of Ultron? Simple: Cap is a soldier; it's all he's dreamed of and it's all he knows. In his vision from the Scarlet Witch in the same film Cap saw a life where he'd survived WWII and got a life without war, a life without a purpose. Cap needs a fight — he needs a cause — and that makes him unworthy to hold Mjolnir.
Cap is very likely to pick up Thor's hammer in Infinity War and the fact that he's done it multiple times in the comics only backs up this theory. Each time Cap's used Mjolnir Thor has been subdued during an incredible battle, and both times it didn't last longer than the fight required.
Of all the Guardians, #Groot is the most pure and worthy to use Thor's hammer. It would also be a fun way to integrate the Guardians and Avengers teams, similar to how they teamed him up with Vision in Age of Ultron, and quickly learned to trust him.
Groot has actually wielded Mjolnir once in the comics, just not main continuity Groot. During "Battleworld," a huge Marvel multiverse crossover, we saw an army of Thors (all from different universes). One of those Thors was actually a Groot from an alternate reality who had a Mjolnir of his own.
Having #Vision hold Mjolnir again as he did in Age of Ultron seems like an easy answer since we already know he's worthy. In the final battle with Ultron we even saw Thor and Vision pass around the hammer while smashing robotic soldiers.
Vision may seem like the obvious choice to grab Mjolnir from Thor, but there's also a very strong possibility he'll be destroyed since the source of power to his android body is one of the infinity stones Thanos is looking for.
4. Iron Man
Tony Stark may seem like an odd and unworthy choice to take up Mjolnir, but over his eight-year arc we've seen Tony Stark go from irresponsible playboy to semi-responsible guardian of the world. Whether you side with Stark or Rogers during their Civil War, you have to admit that Stark is trying to make the world a safer place — "a suit of armor around the world" so to speak.
Even though Tony wasn't able to pick up Thor's hammer in Age of Ultron he has wielded it once in the comics when it was in space (so, did it move it around or was it the lack of gravity?). Either way, with the cosmic adventure that will be Infinity War, it's very likely we'll see outer space scenes take place in the movie, and I would love to see this hilarious monologue from Stark.
5. Doctor Strange
Even though the Master of the Mystic arts is relatively new to the Marvel Cinematic Universe, he'll be making a third appearance in Infinity War. Strange is set to appear alongside Thor in Ragnorak this year, and since we know that Thor will be separated from Mjolnir, it's possible that Strange will help Thor find the missing hammer.
In the comics there is a Thor storyline where Strange helps Thor repair the hammer with magic, and the two discussed that Stephen is one of the few who had access to such magic to repair it. Even if he doesn't end up picking up the hammer, it would be awesome to see this scene play out in Ragnorak, or even as the catalyst that brings Strange into the Avengers.
6. Black Panther
We don't know much about T'Challa in the #MCU — he popped up only as a secondary character in Civil War — but made quite an impact. Since his solo film is set to debut only months before Infinity War, we know we're going to get a much more in-depth look at both the King of Wakanda and his country's culture. As both a King and a superhero, T'Challa has a unique perspective of right and wrong, and a perspective into selflessness that few other characters have. We witnessed this when he rescued Cap, Bucky and the other Secret Avengers, putting aside his anger and desire for revenge.
T'Challa hasn't wielded Mjolnir in the comics; however, having him do so in #InfinityWar would only strengthen his character's future in the MCU. As we move forward out of Marvel's Phase 4 and into the future, it's likely that T'Challa will become an anchor of the franchise with Spider-Man and Captain Marvel, while others such as Cap, Stark and Thor either die or shrink back to lesser roles as a "passing of the torch." With his unique perspective as King, T'Challa mirrors Thor in ways that other characters are not.
It's no secret that we're getting a large dose of Hulk and Bruce Banner in what's been described as a "cosmic road trip" in Thor: Ragnorak later this year. So far, the film seems like it'll be a "road trip" in search of Odin, Mjolnir as well as answers to the Infinity Stone mess that Thor discussed at the end of Age of Ultron.
Even though Hulk has never officially been called worthy to hold Thor's hammer, he has held it while Thor moved it from a distance, making it appear to Hulk that he was fighting with Mjolnir. This would be an awesome thing to see in Ragnorak, especially if the duo has to fight their way to the hammer itself. Could the Collector have it? Loki? Thanos himself somehow? No matter who, it's likely they won't give it up easily.
8. Black Widow
Oddly enough, Widow declined an attempt to pick up Mjolnir in Age of Ultron. It would be a hilarious twist if Mjolnir had thought of our heroine as worthy the entire time. Some may argue that she's an assassin and a killer so she can't be worthy. However, I argue that so is Thor: He's killed when need be, such as the war we witnessed at the beginning of The Dark World. In the comics one of the things Mjolnir requires of its users is actually one of the reasons Spider-Man has never been worthy of the hammer: He refuses to kill even when it's necessary.
Widow has used the hammer once, during an epic fight where the need was incredibly great. Even if she was pure and worthy only in that singular moment, it would be awesome to see her pick up the hammer during the climactic fight against Thanos. Everyone keeps saying Jane Foster could become the next Thor and successor of Mjolnir as she was in the comics, but what if it were #BlackWidow instead? It would make sense, especially if Thor ends up being killed. Fans already want a Black Widow solo movie; what if that solo film was just Black Widow as the new Thor?