One common theme is discovery. The oc often discovers Jean Grey's powers and her complex personality. For example, in many stories, the oc is new to the X - Men world and has to learn about Jean Grey. Another theme is friendship. They start as friends and sometimes it develops into something more. In some fanfictions, they support each other through tough times like when Jean Grey struggles with the Phoenix Force.
Power and control is a prevalent theme. Given Jean Grey's powerful abilities, especially the Phoenix Force, the oc often has to deal with how to handle her power. Sometimes it's about helping her control it, other times it's about being in awe of it. Another theme is sacrifice. In some stories, either the oc or Jean Grey has to make sacrifices for the other or for the greater good. This adds a layer of depth and drama to the relationship.
One common theme is the discovery of self. The OC often goes through a journey of self - discovery while interacting with Jean Grey. For example, they might learn about their own powers or their place in the world because of their relationship with her.
One major theme is the struggle between the OC's normal life and the extraordinary world of mutants that Jean Grey represents. Also, themes of acceptance are quite common. The OC may face discrimination, and Jean Grey helps them through it. For example, in some fanfics, the OC is a mutant with a very visible mutation, and Jean Grey uses her telepathy to help the OC accept themselves. It can be a very emotional and relatable theme. There are also fanfics that revolve around the theme of sacrifice, where either the OC or Jean Grey has to make a difficult choice to save the other or the entire mutant community.
A frequent theme is probably adventure. Fanfictions often take the characters on new and exciting adventures. In the case of Jean Grey OC A14 fanfiction, it could be adventures that are related to the X - Men's fight against evil. The OC could bring a fresh perspective to these adventures, adding new twists and turns. Also, the theme of sacrifice can be present. Jean Grey has a history of making sacrifices, and the OC might be involved in stories where sacrifice is a central element, either making their own or being affected by Jean Grey's sacrifices.
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.
One common theme is the power dynamic. Naruto has his own set of powerful ninja abilities and Jean Grey has her telepathic and telekinetic powers. So, stories often explore how they use their powers together or in contrast to each other.
Another theme is the idea of outcasts coming together. Jean is a mutant, often seen as different in society, and Peter is a superhero with his own set of problems. Fanfictions usually focus on how they understand and support each other in a world that doesn't always accept them. They form a bond based on their shared experiences of being 'other'.
One common theme is the exploration of their powers in relation to each other. Since Peter has super speed and Jean has telepathy and telekinesis, fanfics often show how these powers can either complement or clash. For example, Jean might use her telepathy to anticipate Peter's movements during a fight.
One common theme is the power struggle between them. Given their powerful psychic abilities, they often clash or compete in fanfictions. Another theme is friendship. Some stories explore how they could put aside their differences and become friends. And of course, there's the theme of rivalry for the affections of other characters, like Cyclops for example.
Another theme is identity. OCs in these fanfics usually have to define themselves in relation to Jean Grey's Dark Phoenix form. Are they an ally? A rival? This exploration of identity adds depth to the stories.
Love and relationships also play a big role. It could be a romantic relationship between characters from both universes or just friendships that form across the boundaries. There can be a theme of adaptation too. How would a character from one universe adapt to the rules and culture of the other? For example, how would a Twilight vampire deal with the presence of mutants like Jean Grey who have such different powers and ethics. And often, there's a theme of power struggle, as both universes have characters with different levels of power and influence.