we root for relatable protags
Then go look elsewhere.
This is not the kind of story One Piece is.
As I said in a previous post, One Piece is written like a mythological story.
Are mythological 'characters' (aka mythical heroes, demigods, deities etc) ''relatable''?
In One Piece, characters are the personifications of themes, of processes etc.
See One Piece as a big metaphor instead of a modern peak into the (especially adventurous) lives of actual, yet fictional people.