An ancient soul has journeyed here from the river of time.
Apart from an almost eternal lifespan and a face that never grows old, he seems no different from any other human, with no special abilities at all.
He has left his mark in countless legends, hiding his presence throughout the history of human civilization.
Though he has long since forgotten why he embarked on this lonely journey.
“But write it all down,” a voice in his memories said. “Please don't forget the people you meet.”
Then I'll do as he says. I'll write a book.
Slow burn, episodic. All names of people and places are fictional and have no connection to reality. No historical research, just stereotypes. There are some supernatural elements for the sake of the plot; call it an alternate universe. It isn't quick transmigration, but you can read it as if it were.
A story about someone who has lived so long that he's seen just about everything. The protagonist will form bonds with many people, mostly familial and platonic.
Theme: Time will answer every question.