Violence Ken in "SVC Chaos" has been made from this idea of Evil Ken in MUGEN.
You're trying to convince me that SNK copied the idea of an evil ken from some MUGEN character? Do I really need to point out how absurd that is?
There are almost no original character designs in MUGEN, almost every MUGEN character I see is a sprite rip from something or other (if not a Capcom or SNK fighter then a mario game or something else). SNK were the first to use those 'evil' over-powered versions of characters (Orochi Iori, Ultra Rugal, etc) and it could be argued that Capcom's Evil Ryu was just stolen from SNK's original concept. You're telling me that the devs at SNK scoured the bowels of the internet to find this ken-in-a-dark-room-with-akuma's-moveset sprite and based their entirely superior (and actually original) character on him?
EDIT: Toned down the flame a little