I do remember back in 08 that most of my roster consisted on Marvel, Capcom, and SNK characters. If by memory, POTS Shin Gouki was probably the first character I added to the roster.
Reu's Dragon Claw was way ahead of it's time and no doubt one of the coolest Mugen OC's of that time period.
If I had to choose between his Evil Ryu or Ken, it's Evil Ken no doubt. Not only that we got the best Evil Ken at the time but something about Evil Ken is badass. His winposes are cool especially the ones where Bison taunts him with Evil Ken retaliating or the one where the "Satsui No Hado" releases and Ken faints at the end. His COME ON! taunt is pretty cool too.