Jack Sparrow: Not all treasure is silver and gold, mate.
The fact Jack didn't meet Buggy is a crime.

Jack could somehow be an amalgamation of Luffy’s freedom, Buggy’s treasure desire, Shanks’ party skills, Bon Chans lovability, Ussop story telling, and Sanji’s dating skills lol

If Jack was able to bring his compass with him he'd find the One Piece inside of a year. Its basically a Log Pose for literally any destination.

As many people have made the joke of, Jack would probably stumble upon a new Haki called Fools Haki. A haki that makes everyone around him drop their guard when activated.

to be honest i feel like jack wouldn't like the idea of being rejected by the sea for power. He just gives the vibe of someone who loves the sea so much he would rather find an alternate way to be powerful instead of eating a devil fruit.

I like to think that Jack's Conqueror's Haki would make people drunk rather than knock them out

" I got a devil fruit! I got a devil fruit! And guess what kind it is!"

In the context of One Piece, Jack Sparrow is the epitome of a character who is free and does what he wants whenever he wants. He follows his gut without question and always seems to land on his feet no matter what predicament he finds himself in. Plus he's a great fighter. By all these metrics he'd be Yonkou level in one piece.

I... Almost feel like Jack would value the ability to swim more than a devil fruit power and try to get by with just haki. Think about how many times he's swam in the movies and how many times it's TOTALLY saved his life

Jack: Eats a devilfruit
Also Jack: I challenge you to a swimming contest!
Drowns while Ryuma also fails to keep himself intact.

Feel like jack would 'dive' at the the same time as Ryuma; then reveal his devilfruit for a coy win as he turns into a sparrow mid-dive and swoop back up as Ryuma falls into the water.

jack:eats a devil fruit
jack:challenges ryuma to a swimming contest

Jack would basically be roger mixed with kaido, so op

Jack Sparrow is the man marked by flames
The reason why he leaves whirlpools is because he drives his ship while drunk.

Jack survived being in literal hell for a year with no food, water or stimulation without fully losing his mind.
In a will-power based magic system, jack hecking solos.

"You see mate, captain sparrow is an actual sparrow in disguise. Ever see that damned bird flying about? It's the captain I tell ya"

"Why is the rum... always gone..."

"Zeee-HaaaHahahaha!"

This gave me an idea for something even stranger: an AU where Gordon Ramsey gets Isekaid into the One Piece world. He goes around critiquing a ton of restaurants along the grand line until Big Mom recruits him for his cooking skills. Then when he hears that people are starving in Wano he talks her into overthrowing Kaido and taking his road poneglyph so he can open restaurants there.

And of course he would have conquerers haki

I find it hilarious how Jack Sparrow is the amalgamation of Luffy, Zoro and Sanji

Bro will be like

"I fought real davy jhons"

"It's not that much of a mystery"

This makes me think of the scene were Jack was showing off the Dutchman's heart. Then after he falls down and gets back up, Luffy joins in and they just start singing, "We've gotta jar of diiirt! We've gotta jar of diiirt!" Just because he thought it was funny!