Personally, I can't choose between Viking, Hero and Medieval AU, I like all three options

Viking seems fun

I would really like to see a One Piece western

A Western AU.

King of the vikings sounds cool

I’d love to see a martial arts version of One Piece. Adding in devil fruits and Haki along with whatever magic martial arts power they have(because everything has one, they always do), I think it’d be really interesting

ONE PIECE WORLD WAR 1!!!!!

Definitely the viking