The number of Marvel comic heroes is constantly changing and growing. As of now, there are well over 8000 characters, but new ones are always being introduced.
Jean Grey is the most important as she becomes the Dark Phoenix. Then there are the X - Men like Cyclops, who is Jean's love interest and has to deal with her transformation. Wolverine also plays a significant role as he has a complex relationship with Jean. Professor Xavier, the leader of the X - Men, tries to help Jean control her powers. And the Shi'ar Imperial Guard are important antagonists as they try to stop the Dark Phoenix from causing more destruction.
The Dark Phoenix comic book story centers around Jean Grey's transformation. Jean is a powerful mutant, and her powers reach a new level when she becomes the Dark Phoenix. She has a new, darker personality. One of the major events is her encounter with the D'Bari star system. She absorbs the energy of a star in that system, which has catastrophic consequences for the planets and life there. The X - Men, her friends and teammates, have to decide whether to try and rehabilitate her or stop her by any means necessary. It's a story full of drama, action, and moral dilemmas.