THOR
Real name: Thor Odinson
Actor: Chris Hemsworth
Prior film appaearances: Thor (2011), The Avengers (2012), Thor: the Dark World (2013)
In a released "Avengers: Age of Ultron" clip, we see the gang trying to life Thor's hammer to no avail, much to the Thunder God's amusement. But Thor's grin soon slid off his face when the righteous Captain America very nearly lifted it up - after all, the mythical hammer is only able to be wielded by the most worthy. And for all of his regal Godliness and ethics, Thor has been known to be pretty arrogant (in the comics at least), although now humbled by the Earthly transgressions.
Secret: He is burdened by Personal Inadequacies
We even caught a 'blink-and-you'll-miss-it' scene in The Avengers, while Thor walked to pick Mjolnir up instead of summoning it to him, after plummeting to Earth in the Hulk's cage from the Helicarrier - a symbolic fall from grace perhaps. Coupled with his possibly feeling guilty of jeopardising humanity and in with Asgardian troubles, we interpreted it as Thor feeling unworthy of his powers. And his feelings of helplessness and inadequacies will only be magnified once the God is up against Ultron's might.
