Or maybe there isn’t any adult Momo or Black marian and robin

The hints are
-this Devil thing,
-Rayleigh using haki and
-a picture of human evolution


-The devil thing = king
-The picture of human evolution implies races implies king’s race
-rayleigh using haki implies the second strongest uses a haki technique means we see King’s haki techniques
The hint is the picture itself. Redon doesn't want to make things too easy so he cropped out the top part of the image.

It's a depiction of Saint Michael Archangel defeating Lucifer
 
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