The two main characters are Jon and his sister. Depending on the nature of the fanfiction, they could be very different in terms of character traits. One might be more outgoing while the other is more reserved. But the beauty of it is seeing how they interact and how their relationship unfolds when they meet.
It's possible that there is some sort of conflict at first. For example, they may have had a misunderstanding in the past that led to a rift between them. But as they meet, they start to clear up the confusion and gradually repair their relationship. This could involve apologies, explanations, and a newfound understanding of each other.
Well, one possibility could be that Naruto is initially shocked to discover he has a sister. Maybe she was hidden away for some reason, like to protect her from the same threats Naruto faced as a Jinchuriki. They might bond over their shared family history and Naruto could finally have a real family connection that he always secretly longed for.
In the fanfiction, Goku might be initially shocked to meet his sister. He could then start to feel a strong sense of protectiveness towards her. Maybe they would train together to become stronger.
Well, in such a fanfiction, they might initially be shocked to discover each other. Maybe they start to share their different life experiences growing up. For example, Uzumaki could talk about his adventures and training, while his sister could share about her own challenges in a different environment.
In this fanfiction, it might also be about Jack Frost finally reuniting with his sister after a long time. He could be excited to share all his adventures with her. They might spend time reminiscing about their past, and then Jack could teach his sister how to skate on the frozen ponds he creates. There could be some comical moments too, like when his sister tries to make her first snowman and it turns out all wonky.
In a 'naruto meets his twin sister fanfiction', perhaps his sister has been living in a different village all this time. When they meet, she could be a very powerful ninja in her own right. Their meeting could stir up a lot of emotions, like Naruto feeling a sense of family he's never had before. They might team up to face a common enemy, using their shared bloodline abilities in unique ways.
At first, they might be a bit competitive, especially in their studies at Hogwarts. But then, when they realize that they are stronger together, their relationship deepens. They could have heart - to - heart talks late at night in the Gryffindor common room. Also, if one of them gets into trouble, like the twin sister accidentally breaks a school rule, Harry would cover for her and vice versa. This would build a strong bond of trust between them. And as they face the challenges of the wizarding world together, their relationship evolves into one of unwavering loyalty.
There could be the Guardians. They might play a role in the story. For instance, they could be initially hesitant about Jack Frost's sister being around, fearing she might disrupt the balance. But as they get to know her, they become friends. North could be there, with his jolly self, giving the sister a little magical gift.