Many creators share their curated Mugen games on YouTube or Discord, offering pre-configured, portable, or compressed packages (similar to the "Jump Force V13" compilation).
The "500 characters" part of the search term is a huge draw for players. A standard MUGEN engine might only come with a handful of sample characters. However, created by fans compile hundreds of community-made characters into a single, ready-to-play package. anime mugen 500 characters portable download pc hot