A Lord of the Rings Non-AU Headcanon
I know that there’s been headcanons floating about postulating that perhaps Fili and Kili were reborn as Merry and Pippin. And it fits, in a sense. Merry and Pippin were both merry, mischievous, close as brothers and pretty much the closest things to Princes in the Shire, being that Merry was the heir to the Master of Buckland and Pippin was the future Thain.
But what if Boromir was the reincarnation of Thorin Oakenshield? He was a good Man and a fine Captain of Gondor, loved and respected, honorable and proud, willing to do ANYTHING to protect his people and was, in the end, led astray by something “precious.” Just as Thorin once was. Also, Boromir was meant to be the Steward after Denethor and he never got to hold that office, just as Thorin never got to be actual KING Under the Mountain.
What if Boromir, somehow knowing that “Merry and Pippin” had already died shielding him with their own bodies, chose to reverse that fate? In their last life, Fili and Kili died defending him. In this new life, Boromir/Thorin would shield his hobbits/nephews with his own body, dying to protect them.
In whatever life they are, the Durins would still kill and die to protect each other.
ETA: Somebody asked if Faramir was Frerin. Why not? This time, Frerin got to live a full life and did not end up dying too young in battle.