Well, they'd probably have a stronger initial bond. Instead of starting off as rivals, they might be more like partners from the start. They'd have a natural inclination to look out for each other more directly.
If they were twins, their relationship would likely be more harmonious in some ways. They'd grow up with a better understanding of each other. Since they are twins, they might be trained together from a young age. This would lead to them having a seamless teamwork in battles. Their relationship would not be as adversarial as in the original story, but rather a symbiotic one where they rely on each other's strengths and cover each other's weaknesses.
As twins, their relationship could be more complex. They might share thoughts or feelings in a way that normal siblings don't. For instance, they could sense when the other is in danger even from a great distance. This would make their connection deeper and more intertwined. They might also have a secret language or way of communicating that only they understand, which would help them in their ninja missions. However, they could also have more intense arguments because they are so close and might feel more betrayed when the other does something wrong.
Well, if Naruto and Sakura were twins in a fanfiction, their relationship with Sasuke would be quite different. Naruto might be more protective of Sakura as his twin sister. He would be more likely to step in between Sasuke and Sakura if Sasuke ever made Sakura sad or angry. Sakura, on the other hand, would have the support of her twin Naruto. She might be more confident in dealing with Sasuke, knowing she has Naruto by her side. Maybe she would be less desperate for Sasuke's attention as she has a stronger family bond with Naruto.
The twins would likely have a very loving relationship with Naruto. Naruto, having grown up without parents himself, would be extremely affectionate and dedicated to his children. He would teach them important ninja values and skills, and also share his own experiences with them.
Fraternal twins come from two different eggs and sperm, while identical twins come from a single fertilized egg that splits. So, fraternal twins can be different sexes, but identical twins are always the same sex.
If Percy and Thalia were twins, their relationship with Luke would change significantly. Luke might see them as a bigger threat to his plans. He might try to drive a wedge between them, knowing how strong they could be together. Their relationship with Chiron would also be different. Chiron would have to train them in a way that takes advantage of their twin connection, perhaps teaching them special combat moves that only work when they work in tandem. The gods would also treat them differently. They might be more watchful of the twins, fearing their combined power could disrupt the balance among the demigods.
Edward might be very protective of the twins. Since he has a close relationship with Bella, he would see it as his duty to keep the twins safe from any harm. He could also be interested in seeing if the twins have any special abilities related to his own mind - reading ability.
They would probably approach with kindness and concern. They may offer a listening ear to the suicidal human.
The Ravel Twins' magic might be able to influence Naruto's shadow clones. They could use their magic to give the clones additional abilities, like the power of flight or the ability to phase through objects. In return, Naruto's clones could be used as decoys or additional manpower in battles against magical foes. His chakra could also provide a stable source of energy for the twins' more draining magical spells.
In such a fanfiction, their relationship could be complex. They'd likely have a deep bond from the start. Naruto's exuberance might contrast with Gaara's initial aloofness, but as twins, they'd have an unspoken understanding. They could support each other in their respective ninja journeys, Naruto helping Gaara open up more, and Gaara being a steady presence for Naruto.
At first, their relationship might be full of confusion. They've been brought up with different values - Harry with his Gryffindor courage and sense of justice, and Draco with Slytherin pride and ambition. But as they discover they're twins, they'd start to see the similarities in themselves. They might begin by being a bit hostile towards each other, but gradually, as they face challenges together, like dealing with a particularly tough teacher or a dangerous creature on the grounds, they'd form a bond.
It could start casually. Maybe they meet during a Quidditch match or a school event. They exchange glances and start small conversations. As time goes on, they find they have common interests like a love for a particular type of magic or a shared dislike for certain school rules. This builds a foundation for their relationship, which gradually deepens into love, leading to marriage.