Espers

Espers are people, drawn from many different races, who awaken to psychic powers on their own. Such individuals are uncommon, but those who manifest the gift can grow tremendously strong. Geryuganshoop once boasted of being the universe's foremost psychic combatant, a claim that was never verified, while Tatsumaki stands as the mightiest esper the world has actually witnessed. Certain technology can amplify these abilities, as it does for Gearsper, and dedicated training can grant psychokinesis even to those not born with the talent.

The powers most tied to espers are psychokinesis and telepathy. That strength carries real limits, however. Pushing too hard drains the body severely, bringing on exhaustion, blackouts, or even bleeding from the mouth, as when Tatsumaki coughed up blood after crushing the fusion of Psykos and Orochi, and both Gearsper and Fubuki collapsed from overexerting themselves. An esper's attacks also hinge on tracking a target's movement, so a foe too fast to follow cannot be struck accurately, which left Fubuki unable to keep up with the blur of Bomb and Garou's fight. A head injury or brain trauma can switch the power off for a time, and individuals of exceptional willpower can resist psychic assaults outright, as Saitama did against Tatsumaki.

Espers surface across every major faction. The Hero Association counts Tatsumaki, her sister Fubuki, and Gearsper among its ranks, while the Monster Association fielded Psykos and the deceased Evil Eye. Others include Geryuganshoop of the Dark Matter Thieves, Slugerous of the House of Evolution, Apollo and a spy of Tsukuyomi, and Wavygyaza of the Neo Heroes, with figures such as Otento and the Blizzard Group added in the webcomic.