Akio Ōtsuka
is a fictional character in Capcom's "Street Fighter" fighting game series. First introduced in "Street Fighter IV", he is the final boss of the game and its subsequent updates. He is the chief executive officer of the Shadaloo Intimidation Network (S.I.N.), the weapons division of the Shadaloo terrorist organization in the game's narrative. His body has been heavily modified using advanced technology, with a device installed in his abdomen called the "Tanden Engine". Other appearances by Seth include "Project X Zone" and "Street Fighter V". Seth is voiced by Akio Ōtsuka in Japanese, and Michael McConnohie in English.