Phantom of the Server's (P.o.t.S) Capcom vs. SNK 2 version of Shin Akuma is by far the most fluid and useful character I have ever used. In my seven years of playing Mugen, I haven't played with a character that suits my playing style as perfectly this one.
The character moves list is excellent and includes all - plus extra moves to make Shin Akuma a deadly character to choose. Shin Akuma is a solid rival and if you edit the main scrrenpack's mugen.cfg and turn on the A.I cheat capability, he's deadly. When I’m using other characters and I am unable to defeat them, I always revert to Shin Akuma to assure victory.
The only improvement I would suggest is a High Resolution version as an update. However, this is merely an aesthetics improvement as in my opinion; the character is an almost perfect. Every other aspect of the character is perfect, which is consistent with P.o.t.S' other characters which play as well.
P.o.t.S' CVS Shina Gouki (Shin Akuma) is readily available on many sites and is still currently downloadable as of the 22nd of May 2014.
Conversion accuracy 10/10
Special moves (including additional moves) 10/10
Visuals (when created) 10/10
Visuals (as of 2014) 7/10
Artificial Intelligence 9/10
P.o.t.S' CVS Shin Akuma is a must have addition to your Mugen roster.