Jean Grey it’s one of the most powerful telepaths, to such an extent that she had been stated to be the most powerful. Jean is able to use her telepathy in different ways as Mind Communication, Mind Reading, Mind Transferral, Mind Detection, Psychic Surgery, cast near flawless Illusions, project her Astral Form, control the Astral Plane, create Psychic Links with other beings and Mind Manipulation. She’s able to manipulate minds in different ways as Mind Control, Mind Possession, Hypnosis, induce Paralysis, modify or erase someone memories, Amnesia, prevent another mutant to use his powers, increase another mutant’s powers, induce Pain, change someone’s personality. At close range Jean can manipulate any number of minds at once. Jean can also mentally injure, stun or kill opponents with bolts of pure psionic force. Her psychic powers are so strong that they can bypass numerous forms of immunity and resistence.
Jean Grey it’s also able to protect her mind and another’s ones from Mind Intrusion. Her defensive telepathy allows also her to Cloak Mind and to Telepathic Cloak.
After her power switch with Psylocke, she temporally manifests a Phoenix symbol over her right eye on her astral form. Jean also starts since this moment to manifest her telepathy as a Phoenix raptor.
Emma Frost herself, stated that Jean Grey "..goes beyond a regular telepath(...) she's judge and jury".
Animal Telepathy – She can psychically read and the minds and communicate with animals.
Mental Manipulation – She can manipulate and control the thoughts, mindsets, and upper brain functions of others.
Mind Walking – She can enter the mind of another person.
Psionic Blast – She can launch psi-blasts to cause mental damage.
Psychic Communication – She can communicate with ones mind.
Psychic Illusions – She can create and manipulate near flawless psychic illusions.
Psychic Inhibitors – She can place psychic inhibitors in others’ mind.
Psychic Shield – She can protect herself or others from psychic penetration.
Psychic Shield Penetration – She can penetrate psychic shields.
Psychic Energy Manipulation
Psychic Pyrokinesis – She can manipulate flames made out of pure psychic energy.
Psychic Electrokinesis – She can manipulate electrically charged psychic energy.