shin_akuma
Shin Akuma (known in Japan as Shin Gouki) is the super-powered form of Akuma (street fighter), tapped into when Akuma is using the full extent of his power rather than merely holding back. When in "Shin" mode, Akuma's hair turns ghost-white, his eyes go red, he gains a purple aura when he uses his abilities, and he sports a terrifying grin.