Seems to be missing Xihark's Master Chief.
http://www.mediafire.com/download/s7h31yb476p5cjg/Masterchief.zip
It's got a bug where it can use it's machine gun special even at 0 Power, I don't know how to fix it tho.
Have you tried Legacy? It comes with two sizes, 228 and 839 slots. It's for 1.1 tho. http://mugenguild.com/forum/topics/legacy-normal-portsupdated-by-noz-166796.0.html
If you are looking for 1.0, I recommend simply getting mugen world tournament.