Phoenix Man is a mysterious being who showed up during the S-City attack alongside Elder Centipede, working as an ally of the Monster Association. Not much is known about him beyond that initial appearance, which honestly adds to his mystique—fans have spent plenty of time trying to figure out exactly what his deal is.
He's a member of the Monster Association proper, though the specifics of his role or how he ended up with them remain pretty vague. His connection to Elder Centipede during that particular assault is one of the few concrete things we know for sure, and it was enough to mark him as a genuine threat in the eyes of the heroes who were there.
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