Captain America

When asked how 'Captain' was worthy to lift Mjolnir in Avengers: Endgame, according to Anthony Russo, he's always been worthy, and during that moment in Age of Ultron, he stopped himself from lifting the hammer fully out of deference to Thor: “In our heads he was able to wield it, and he didn't know that until that moment Ultron when he tried to pick it up. But Cap’s sense of character and his sense of humility, sort of out of deference to Thor's ego, you know Cap in that moment realizing he can move the hammer decides not to.”