Thor is no longer arrogant; he's been humbled. He's grown much since his last movie. The Thunderer doesn't appear foolhardy in this picture. Calm, confident, and prepared; but no longer looking for a fight.
Spiderman. I hate spiders. But Peter Parker has always been my favorite superhero because I can see someone actually having their DNA introduced to a spiders, and be genetically changed into a man that swings on thread.