What character, in your opinion, represents a hero with the highest moral character. 

So to start, except for this Hail Hydra Arc, Captain America (Steve Rogers) is the pinnacle for me. He always does the right thing, no matter what.

Who are your heroes? Who always does the right thing? Who doesn't play in the grey areas? Who is your choice for a modern-day heroic paladin?

And, of course, you can only have ONE choice, so struggle as needed until you have your paragon.

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EDIT:  Ok a change to the rules. We have, so far:

Silver Surfer (Stan Lee & John Buscema days).