It's the band gimmick, they ARE supernatural beings who took the band members as hosts. They have/had a comic called Kiss: Psycho Circus that even spawned a really fun FPS back in the day. You can also find action-figures and other merchandise based on the characters.
It's not a deep lore like Gorillaz, though, they are just personas they take on stage.
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Arn
Feb 24, 2021 at 10:10PM EST in reply to