Mugen V9: One Piece

One Piece Mugen V9 is a fan-made 2D fighting game developed using the MUGEN engine. It is designed to bring the universe of Eiichiro Oda’s One Piece into a competitive battle format. Unlike official Bandai Namco fighting games (like Pirate Warriors or Burning Blood), this game utilizes a "dream match" format, allowing a massive roster of characters—from the East Blue Saga to the Wano Arc—to fight against one another. It is widely considered one of the most polished and content-rich One Piece MUGEN projects available online.

It is important to address the elephant in the room. One Piece Mugen V9 uses copyrighted characters, music, and voices without permission. Historically, Toei Animation and Bandai Namco have tolerated small fan projects as long as they are not monetized. Do not pay for this game. No legitimate version costs money. If a website asks for a credit card, it is a scam. One Piece Mugen V9

Because it is distributed via torrents and fan sites, and because Mugen itself is a generic engine, it is unlikely that V9 will ever be fully erased from the internet. It survives in the same legal grey zone as ROM hacks and fan comics. One Piece Mugen V9 is a fan-made 2D

Every member of the crew, across multiple arcs, is fully represented: It is important to address the elephant in the room

The game utilizes 2D pixel sprites. The quality can be inconsistent because assets are often sourced from different creators or older games (Game Boy Advance, DS, and Arcade titles).

The game uses a simple 3-button layout (Light, Medium, Heavy) plus a “Special” button, making it accessible to casual One Piece fans who might not be hardcore fighting game enthusiasts.

The defining feature of V9 is the sheer volume of playable characters. While official games often cap rosters at 40-50 characters, this MUGEN iteration often includes 100+ slots.