"The loneliest people are the kindest"
is because now they are very few in this world, while the bad infest the streets.
Beyond my personal passion for comics, I think all the Avengers can make a far more profound message of "Revenge", especially to the new generations.
Start with Captain America, one of my absolute favorites,associated whit the quote: "The loneliest people are the kindest," I think it's perfect for this superhero.
I hope you enjoy and inspire you :)