The CEO of the weapons corporation S.I.N., Seth is a man unafraid of using the most advanced technology on himself, which has changed him on a seemingly structural level and made him much more than human. Seth is intensely set on completed S.I.N.'s most ambitious program, the BLECE project, which requires the strength of Ryu and the Satsui no Hadou. Having collected data on the greatest fighters in the world, Seth borrows moves from a number of different characters to create a fighting style of his own. Being the game's boss character, Seth is extremely powerful and has immense potential for combo development.