One Piece M.U.G.E.N V12 is a fan-made fighting game developed using the M.U.G.E.N engine, specifically updated to version 12 to include a massive roster of over 170 characters

The roster spans the entirety of the series' timeline. Players can pit the classic, early-era villains like Kuro and Don Krieg against the modern titans of the New World, such as Kaido and Big Mom. It allows for "what if" scenarios that fans have debated for years: Who would win in a fight, the Straw HatMonster Trio or the admirals? The inclusion of minor characters—memorable fodder and side-characters often forgotten by mainstream games—is a love letter to the dedicated fanbase. It validates the viewer’s time, suggesting that every character, no matter how small their screen time, deserves a spot on the character select screen.

: The ME Repack significantly reduces load times and prevents the frequent RAM crashes common in older MUGEN builds.

Fully fleshed-out move sets for Trafalgar Law and Eustass Kid featuring their Devil Fruit Awakening abilities.