Imagine a small group of guardians that have decided to explore an abandoned city on Pluto.
They have just been ambushed by a large group of unknown enemies and are now struggling to take them out.
I swoop in (wearing all black) and save the day by taking out dozens of enemies with my bare hands.
The guardians surround me and a random guardian asks, "Who are YOU?"
[spoiler][b]I'M BATMAN[/b] *vanishes*[/spoiler]
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I would pick either... Clark Gregg - Agent Coulson, cause why not? Benedict Cumberbatch - Sherlock, smaug, etc., because I could classy, clever and menacing all at once. or Liam Neeson - because I think he would legitimately make a good voice for a Guardian