저기요 what is all this evil and demond stuff on the new game and how do 당신 use it and can 당신 use it for all the characters 또는 just some of them?

What? The only ones who's had demonic powers were Akuma Ryu mostly, & it's been around since I think SF Alpha.

There are characters who can do some moves like Akuma 또는 other dark powers but for fun, its not related to the 거리 Fighter story.