Iron Man. Sweet, fragile, genius Iron Man. Those are really good scenes. My favorite moment with him was in Age of Ultron, when Wanda showed him his greatest fear. And he saw himself alive, while everyone was dead and it was all his fault. Aaaand every argument about Tony being bad dies here for me.
Iron Man is the most amazing hero in the MCU. He's the most human, the most broken and the one always sacrificing himself first.

[P.S.: That Thor moment is EPIC]