There are several popular community-distributed "M.U.G.E.N V5" or "V13" builds that come pre-patched with expanded roster limits and custom scripts for large-scale battles. Anime MUGEN 2025
[Select] ;Number of characters allowed per player numchars = 5 mugen 5v5 patch
In a standard Mugen build (v1.0 or v1.1), the engine is hard-coded to allow a maximum of characters on the player’s side at once (with limited 2v2 support via specific localcoord settings). You could have 100 characters in your select screen, but the actual fight was always 1v1. There are several popular community-distributed "M