It doesn’t actually, in the end, matter who he looks like. He could be related to the Charmings or he could be some random fairytale character or he could just be someone new that is made up. This is all speculation based on very little. I think that the guy tweeting that there were some interesting ideas makes it seem like we are all barking up the wrong tree.
LOL yes. It could all be coincidental and the character could just be a random nobody or heretofore unseen Disney villain/literature villain/mythological villain (or hero)
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"He was a lot of things to me" "The only conclusion was love"