Jean Grey Summers is a central character in the X-Men universe. She is a mutant with powerful telepathic and telekinetic abilities. Jean is one of the original members of the X-Men, often portrayed as a compassionate and empathetic figure who struggles with the immense power she possesses, particularly when she becomes the host for the Phoenix Force. Her character plays a crucial role in many story arcs, including the famous 'Dark Phoenix Saga,' where her powers and moral dilemmas are explored in depth.