From the same group of Viners who brought you the Rachel Grey Respect Thread:
Jean Grey is an Omega-Level Mutant and one of the 5 original members of the X-Men. Displaying amazing telepathic and telekinetic powers from a young age, Jean was trained by the most powerful Telepath of her time Charles Xavier and would hone her skills over the years to become one of if not the most powerful Psychics on the planet. Jean is best known for her innate and complex bond with the cosmic Phoenix Force, but even without it's powers she has showcased unprecedented feats of complex telekinesis and unparalleled telepathic aptitude. Wielding limitless potential, Jean has been stated repeatedly to be one of, if not THE, most powerful minds on the planet.
At the age of ten. Jean Grey's telepathy had first arisen through the trauma of her best friends death. Without meaning to, Jean forged psychic link with her dying friend and attempted to prevent her from passing to the other side. It is believed that it was this feat that caught the Phoenix Force attention to Jean Grey. (Bizarre Adventures #27, Classic X-Men #8, X-Men Origins: Jean Grey) It is after this that Professor Charles Xavier helps Jean to control her telepathy before deciding that they are too powerful for her to handle, so he installs blocks to keep them dormant until she matures and masters her telekinesis.
For those unaware, the Phoenix Force is a cosmic entity that represents life that has, is, and will ever exists, as well as the natural cycle of destruction and rebirth. It is also the nexus of all psionic energy in the multiverse, stationed within the White Hot Room, a nexus for all Phoenix hosts who have perished or have traveled to, within the nexus of all realities, the M'Kraan Crystal. Its purpose is one that is apart of evolution where it will 'burn away what doesn't work' to make room for other life to thrive in the ashes of its destruction, which includes stagnant life doomed to die off and taking up space or a variable that threatens the balance of life and its ability to thrive. Noticing Jean Grey as a potential host early in Jean's life, the Phoenix has a special connection with Jean, favoring her the most out of any host and imbuing her its full powers, despite Jean's reservations regarding the being. Thereby, Jean is considered as the most powerful Phoenix host to exist, claimed by the force itself to be perfect whose influence over its power is unmatched.
- Due to the events of Extermination, everything that happened to the time-displaced O5 teens in the 'present' is now canon for their adult selves