In the world of MUGEN, those constraints do not exist. A standard Evolution Rev 2 build typically balloons the roster to include nearly every character who ever appeared in a Capcom or SNK fighting game during the 2D era.
Capcom Vs Snk Evolution Rev 2 Mugen leverages the "high-res" filter of MUGEN 1.0 and 1.1. While the sprites remain 2D pixel art (ripped and smoothed from Neo Geo and CPS2 hardware), the backgrounds are fully remastered. Capcom Vs Snk Evolution Rev 2 Mugen