If I were a hero, I'd be Martin Luther (Part 2179)....

 Superhero Anydays

Don't know the artist, but this is the supervillain group, enemies of the Legion of Super-Heroes, the Fatal Five!

Clockwise from top: Emerald Empress, Validus, Mano, The Persuader, and Tharok in the middle.

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And this is internet celeb and cosplayer Anubace done up as Nightwing. 

POLT