On standard retail consoles, these updates are applied automatically via the internet. In the context of file preservation or homebrew, updates are distributed as separate NSP files that must be installed over the base game to update the version number.
The DLC for Pirate Warriors 4 was released in "Character Packs," primarily based on the One Piece: Whole Cake Island and Wano Country arcs.
In the Nintendo Switch scene, NSP stands for Nintendo Submission Package. It is a file format used for digital games, updates, and DLC directly from the Nintendo eShop. An NSP contains the exact data that would be installed to a Switch’s internal memory or SD card. one piece pirate warriors 4 rom nsp update dlc exclusive
These files are commonly used with PC Switch emulators such as Ryujinx (now discontinued but still in circulation) or Yuzu (also discontinued). Some users also install them on modded (custom firmware) Switch consoles.
There were three primary Character Packs released, followed by a standalone character. On standard retail consoles, these updates are applied
Character Pack 2: Worst Generation
Character Pack 3: Wano Country
Standalone DLC