Psychic

A psychic is a person or creature that possesses a certain paranormal power, usually related to telepathy or clairvoyance.

Background
Several instances of individuals with varying psychic abilities have been mentioned throughout the series, listed by game as follows.

Fallout

 * The Master gained psychic powers after his exposure to FEV. He attempted to create similar psychic creatures, but most of the experiments were failures resulting in insanity.
 * Four individuals in the Cathedral successfully gained the abilities, referred to as psykers. These characters include Wiggum, Lucy, Moore, and Gideon. A device known as a psychic nullifier was utilized to block incoming thoughts.
 * The ability to resist the Master's psychic attacks is represented in the SPECIAL system by the Mental Block perk.
 * Chuck in Adytum will offer to read the Vault Dweller's tarot cards.
 * Tycho mentions that he doesn't believe in psychics or telepathic abilities.

Fallout 2

 * Hakunin, the Arroyo shaman is able to speak to the Chosen One in their dreams.
 * Melchior is a super mutant who has the ability to command creatures such as deathclaws, fire geckos, and mole rats.

Fallout Tactics

 * The Beastlords have the ability to command creatures.

Fallout 3

 * A member of the Treeminders named Bloomseer Poplar can share what she sees in the Lone Wanderer's future.
 * The AntAgonizer has the ability to command creatures such as giant ants.
 * Professor Calvert underwent an experimental procedure to extract his brain in an attempt to extend his longevity. He has the ability to project his thoughts into the minds of others, and wishes to use this ability to achieve "psychic domination."

Fallout: New Vegas

 * The Forecaster is a child who can provide visions of the future. If he utilizes this ability too much, he suffers from headaches and wears a psychic nullifier, which he refers to as his "medicine," to avoid the side effects.

Fallout 4

 * Mama Murphy is a woman who can foresee events after taking chems, an ability she calls "the Sight." She can share these visions with the Sole Survivor.
 * Lorenzo Cabot has powers stemming from an ancient artifact that he discovered during an archaeological dig in the Rub' al Khali. He describes the abilities he has gained, such as exploring the memories of the ancients, communing with those who founded our civilization.

Fallout 76

 * The Flatwoods monster is able to warp the mind "of all but the most iron-willed."
 * The Interloper sent visions to Jeff Lane, beckoning him to Lucky Hole Mine in order to become its conduit.