Charles Xavier I guess since he is quite a bit different form the regular superhero in the two latest xmen movies and encourages villains to stop what they are doing without tearing everything else apart. If that one´s not counted I would go for either badman or spiderman, since they are practically the only heroes in dc or marvel cinema movies which are not practically invincible.
Honourable mention Groot he´is to damn epic to not be considered an option
Please excuse my (probally) poor grammar