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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Obviously Elias Toufexis. I think it would be hilarious just to have a character that grumbles in a grizzled voice, only saying "I didn't ask for this."