Seth is a character from the Street Fighter series, first appearing as the main antagonist of Street Fighter IV. He is the CEO of Shadaloo's weapon division, S.I.N., and one of many genetically engineered replacement bodies for M. Bison.
Seth is just as intelligent as M. Bison himself, with ruthlessness and evil to match. Unlike M. Bison, Seth is generally very calm and concise, though he displays a fair bit of arrogance, often through his annoying-by-design tendency to laugh and gloat when using his more powerful moves. Seth also demonstrates a deep knowledge of the philosophy of human nature and the pursuits of purpose and self-awareness. This unusual trait, coupled with his endless thirst for power, implies that Seth intends to become his own entity entirely and not be bound to M. Bison as his replacement shell. Notably, while Seth appears to be the only "sentient" enhanced being, his Arcade Mode win quote against another Seth implies that at least one other clone may have developed self-awareness.
However, his desire for power and his philosophical pursuits are a one-sided and neutral affair; he displays very little (if any) morality or respect for life, and values people only for their usefulness to him. Due in part to his ego, Seth will keep his S.I.N. subordinates in the dark in case they plan to betray him - insubordination is something he refuses to tolerate. Seth is of the belief that any power is good power, as indicated during his fight with Ryu in the animated film. In addition, despite his philosophical leanings, Seth displays some form of disbelief in the mystic arts; his Arcade Mode win quote against Dhalsim states that if the latter's techniques were truly mystic, he could not possibly imitate them.