universal balance and harmony
In a word "peace", maybe.
What is peace? How is peace kept?
"Peace cannot be kept by force; it can only be achieved by understanding." (A. Einstein)
"If we have no peace, it is because we have forgotten that we belong to each other." (Therese of Calcutta)
"Never be in a hurry; do everything quietly and in a calm spirit. Do not lose your inner peace for anything whatsoever, even if your whole world seems upset." (Francis of Sales)
Drawing conclusions, if the hero exists to keep peace, he cannot force it on other people, he has to let people understand peace by themselves, he has to be the glue that keeps people near each other, and finally he has to keep peace in himself for all the time being while he is the hero of the people.
I doubt any of the depicted modern heroes do anything near these definitions.
But again, having peace in ourselves: is it a real challenge or not? When am I in peace with myself and others? When I don't harm them? A lot of people doesn't harm others but they hate them. When I'm calm and relaxed? Calm and relax don't last forever, I will be put in an uncomfortable situation and I have to be 1 - prepared to react 2 - have the will to react.