One common theme is power struggle. Since Jean Grey as Dark Phoenix has immense power, the OC often has to deal with that power dynamic, either trying to control it or being affected by it.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of X - Men fanfics, including those focused on Jean Grey as the Phoenix. Just use the search function and type in relevant keywords.
In the X-Men comics by Jean Grey, Raven doesn't die. Her character has managed to overcome many threats and remain a vital part of the story. The plotlines often have her finding ways to escape or overcome potential death situations.
I've also heard of 'The Phoenix's Protector'. In this fanfic, the OC is a mutant with special powers that complement Jean Grey's Dark Phoenix. It has some exciting action scenes and the relationship between the two characters is portrayed in a very emotional and believable way.
I really liked 'A New Perspective'. In this fanfic, the OC brings a fresh outlook to the X - Men universe, especially in relation to Jean Grey. It has some really interesting plot twists and character developments. The way the author portrays the connection between the OC and Jean is both engaging and thought - provoking.
The story of X - Men Dark Phoenix is about Jean Grey's struggle with newfound power. Jean is a mutant with telepathic and telekinetic powers, but when she's exposed to the Phoenix Force, she becomes the Dark Phoenix. Her powers skyrocket and she starts to lose her grip on her sanity. The X - Men, her family of sorts, face the difficult task of either bringing her back to her senses or protecting the world from her. It's a complex story that delves into themes of power, identity, and loyalty.
Jean Grey's origin as the Phoenix begins with her being a mutant with powerful telepathic and telekinetic abilities. She was a founding member of the X - Men. One fateful mission in space exposed her to a powerful cosmic force known as the Phoenix Force. This force bonded with her, enhancing her powers to near - godlike levels and also changing her personality at times. It led to a complex and often tragic story arc as she struggled to control this new, overwhelming power within her.
Jean Grey becomes Phoenix due to a cosmic force that enhances her powers and alters her personality. It's a complex transformation that involves various storylines and events.
Well, Jean Grey's transformation into the Phoenix is tied to intense cosmic energy exposure and her already potent mutant powers. There are multiple storylines and factors at play that contribute to this metamorphosis.