My absolute favorite theory is that Dumbledore is literally Death from The Tale of the Three Brothers, and the math behind it aligns so perfectly it’s practically text canon.
Voldemort is the first brother who died for pure power, Snape is the second brother who died for a lost love he could never recover, and Harry is the third brother who greeted Death as an old friend.
Dumbledore is the only character who physically held all three Deathly Hallows at various points in history, and he is the exact person waiting to greet Harry at King's Cross station after he gets hit by the killing curse.
The lead songwriter for the K-Pop Demon Hunters movie: "Yeah so we purposefully made this song impossible for any one person to sing live, to drive home that these characters are superhuman."
Kelly Clarkson: