Often termed as an evil, negative or psychotic energy, Psycho Power is most notably exploited by its best known user, M. Bison. Psycho Power has been described as the corrupted negative of Soul Power, a power demonstrated by Rose; this may be true, considering Rose is the formation of M. Bison's expelled "positive" energy. According to M. Bison's win quotes in Street Fighter Alpha 3, Psycho Power feeds off of another person's fear and the hatred of another.
Nothing is known about the origins of the Psycho Power. It is said that in the past, M. Bison's master was the only known person in the world who could manipulate it; it is also said that, before his death at the hands of Bison, he passed the power to only three other students, Bison himself being one of them.
Through its use, M. Bison has gained a considerable amount of power, expelling all remorse, compassion, and humanity from his soul. In addition to being used in several of his moves in the games, this energy also grants him the ability to float, teleport, and control the minds of other beings, as seen with the Dolls. He can also regenerate via the Psycho Drive, and create a wormhole, as seen during Guile's rival battle with him in the Arcade Mode of Super Street Fighter IV.
However, Psycho Power can exceed the limits of his body; this would prove to be partially responsible for the events of Street Fighter Alpha 3, where he sought out Ryu in order to see whether his body's "ceiling" could exceed that of Bison's current body. Bison also believed that the Satsui no Hado within Ryu was "the ultimate form of Psycho Power", though he does not further explain the connection between the two powers (if any). The game also reveals the existence of a device called the Psycho Drive, which he used as a channel and a power amplifier, making him considerably more powerful. The Drive was destroyed at the end of the game.
An alternate form of M. Bison that uses the "maximum" Psycho Power appears in Street Fighter EX 2; his abilities are significantly enhanced in this form, and he also demonstrates the ability to create duplicates of himself, as shown in his use of the Psycho Cannon in said game.
An altered form of Charlie known as Shadow appears as a hidden playable character in Marvel vs. Capcom: Clash of Super Heroes series in the games. He is the result of Bison's brainwashing experiments on Charlie after he was captured in the previous game. Shadow also appears with Bison in the ending of Shadow Lady, another hidden character who is a what-if based off Chun-Li's Marvel vs. Capcom ending, where Bison plans to do the same to her; Shadow Lady's ending shows a similar fate befalling Jin.
Shadow ultimately retains the same moves as Charlie, though they are now Psycho Power-enhanced and produce blue flames; while Shadow Lady underwent similar experiments, she does not appear to possess Psycho Power, instead having been turned into a cyborg.
In the games, both Juli and Juni have two Psycho Charge abilities that can restore health or refill the Super Combo Gauge. Juni can also use the Psycho Streak Super Combo to summon M. Bison, who then performs a Psycho Crusher.
- Though Gill's Psycho Headbutt shares the same naming scheme as most Psycho Power abilities, this is nothing more than a coincidental occurrence.
- In Street Fighter Alpha 3 MAX, Ingrid has claimed that she is the true bearer of the Psycho Power, as she constantly tells M. Bison that Psycho Power is "her power" and that he has stolen it. However, this detail has been largely ignored, likely due to the contradictions between her story and the main games' storyline.
- Psycho Power is also the name given to SNK character Athena Asamiya's psychic abilities. This is referenced in SNK vs. Capcom: The Match of the Millennium, where Athena tells M. Bison that "Psycho Power's not for evil!" after she defeats him.