If I were a hero< I'd be Martin Luther (Part 3049)....

 Superhero Anydays

Some various Earth-2 superheroes, some members of the Justice Society, some members of Infinity Inc, some members of both. 

Clockwise, bottom left: The Flash, Dr. Mid-Nite II, Power Girl, Green Lantern, Star-Spangled Kid, Huntress. 

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And today we also have a Robin cosplayer, in the red, Batman movie costume. 

POLT