. Originally released in 1999, M.U.G.E.N is a freeware 2D fighting game engine that allows users to create and add their own characters, stages, and UI elements. The "Anime Mugen 540" moniker typically refers to a specific community-curated "fullgame" or "megapack" containing a roster of over 500 characters, primarily drawn from popular anime franchises like Dragon Ball The Appeal of the Infinite Roster