I came across this guy while watching one of these nonsensical videos on YouTube with my nephew. I tried to find some clues and browsed through Marvel and DC lists, but cannot seem to find him. Any help would be appreciated, since 3yo are relentless in their pursuit of knowledge.
Looks like that is supposed to be Captain Marvel/Shazam from DC:
More specifically this is Shazam from the Injustice: Gods Among Us game and the "Injustice: Earth One" universe. You can compare to the video below found by @Valorum: