One Piece: I Am the Clown King!

Looking for Joker Stories. I've Been Obsessed with the Joker Lately

Thank you so much.

Are There No Masterpieces About Pirates?

One Piece + Building Your Own Crew + All Kinds of Devil Fruits

The protagonist forms their own pirate crew, has a System, and gets all kinds of rare Devil Fruits.

Strong Values and a Great Plot

Something like "Whitebeard Really Dares to Kill", where the plot is actually good enough to keep reading.

One Piece: Any Books Where Buggy Becomes One of the Four Emperors?

Original personality: Buggy. Funny, weak, and blessed with Conqueror's Haki-level luck. Alternate personality: The Joker from Gotham. Strong and chaotic. Another alternate personality: ... Ideally, Buggy doesn't know the other personalities exist. Then, somehow, he becomes one of the Four Emperors, and a real one at that.

One Piece Fanfiction

A powerful figure from the old era advances into the city, then after getting out, overthrows the rule of the Celestial Dragons.

A Protagonist with Conqueror's Haki

The more, the better.

One Piece Fanfiction About Buggy