Seth

Seth is just as intelligent as M. Bison himself, with ruthlessness and cunning 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 remain bound to M. Bison as another 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 philosophical pursuits is a one-sided and neutral affair; he displays very little (if any) morality or respect for life, and value people only for their usefulness. Due in part to his ego, Seth will keep his S.I.N. subordinates in the dark in case he plans to betray them - 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 Street Fighter IV: The Ties That Bind. In addition, despite his philosophical leanings, Seth displays rather pragmatic, overly skeptical and cynical displays of disbelief in more intrinsic and spiritual views on life; his Arcade Mode win quote against Dhalsim states that if the latter's techniques were truly mystic, he could not possibly imitate them. Even though he’s cynical, he can get pleasures from fighting, sex, and other activities that has power

Appearance: Seth is an artificial-intelligence designed to inhabit synthetic humanoid bodies that possess a Tanden Engine. As noted by Capcom-Unity, Seth is genderless[5] (the second playable character with this known distinction after Twelve) due to his status as a machine, though he is typically referred to in a masculine manner in English.[6][7]

In his abdomen, enclosed inside a pattern consisting of the Eight Trigrams of Taoist cosmology known as the Taijitu, is an exposed area, which contains a rotating sphere known as the Tanden Engine, which appears to be the source of his power. His eye and skin color changes to yellow and black respectively, when the Tanden Engine is activated.