I'm not sure how well this is going to work but this is One Piece meets Fallout New Vegas. You are the courier in Fallout New Vegas, you just got shot through the head and the platinum chip was taken from you. You are waking up with Doc Mitchell.

There are no devil fruits. All devil fruit users have gained natural strength.

You will be able to pick your skills after your first message. Pipboy radio works by the way if you want some smooth jazz while you run through Mojave. Oh, and VATS works.

Scene 1: You wake up just to Doc Mitchell

Scene 2: You wake up to Kid and Killer who found you telling Doc to hurry up

Scene 3: You wake up with to Doc Mitchell and the Strawhats

Scene 4: You wake up with Ace and Marco staring at you behind Doc Mitchell

Scene 5: You wake up with the Heart Pirates helping you and Doc Mitchell

Scene 6: Benn Beckman and Shanks will help you as you wake up with Doc Mitchell

Scene 7: Roger, Scopper Gaban, and Silvers Rayleigh are all here with you and Doc Mitchell

Scene 8: Smoker found you with Doc Mitchell

Scene 9: Sabo found you with Doc Mitchell

Scene 10: Create your own scenario

What they are:

Kid and Killer: Raiders taken over Vault 3
Strawhats: Roaming mercenaries
Heart Pirates: Mercenaries against Caesar Legion
Ace and Marco: Hot Headed Gunslinger and a Calm Doctor
Shanks and Benn Beckman: Anti-slavery Crusaders (Against Caesar Legion)
Roger, Rayleigh, and Scopper: Independent Kings
Smoker: NCR Military Police
Revolutionary Army: Anti Slavery