Jean Grey

Early Life
Jean grew up in Connecticut, in an utterly normal upper-middle-class family. She has a non-mutant sister, and her parents are still alive and happily married. At some point as a child, Jean Grey developed telepathy and telekinesis. Shortly after these developments, she was taken in by Charles Xavier and joined the ranks of the X-Men, along with Wolverine, Storm and Scott Summers. Jean was the second student to be recruited into the X-Men, making her the team's de facto co-leader after Cyclops.

In the Comics
Ororo Munroe was Charles Xavier first future X-Men he encountered, but Jean Grey was his first student.
 * When Charles Xavier started the X-Men, Cyclops was one of the first members along with Jean Grey, Angel, Iceman and Beast.
 * Introduced as Marvel Girl, Jean Grey was the token woman on the X-Men, and was essentially useless.
 * Jean Grey merged with the Phoenix Force in the 80's and gained god-like powers. After first using the powers for good purposes, she struggles with controlling the Force, a struggle that would continue throughout her appearances in the Marvel Comics.
 * Jean Grey is one of the Most Powerful Mutants in the Marvel Universe.
 * Her sister, Sara was murdered.
 * Jean's powers manifested when she saw a friend get hit by a car.
 * Scott Summers and Jean Grey get married and have two children. Rachel, and Nathan Summers.
 * Nathan Summers/Cabel's father is Scott Summers, but his mother is Jean Grey's clone.
 * Scott Summers had an emotional affair with Emma Frost, who he later married her after Jean's 'death'.
 * Scott married three times. Jean Grey who died. Jean Grey's clone Madelyne Pryor and later Emma Frost.
 * Jean Grey as The Dark Phoenix destroyed an entire planet.
 * After the X-Men split into two teams Psylocke - Comics was constantly trying to hook up with Scott Summers behind Jean's back.
 * Jean Grey may never be able to truly die, but was dead for 6 years once.
 * She is similar to the Ultimate Version since both have exposed navels, but Jean has a casual rather than the Ultimate uniform.