The relationship between them could be a catalyst for their personal growth. Aurora, who was once only concerned with her own small world, would now be part of a much larger one. She would start to think more globally, about the needs of both land and sea creatures. Ariel would also change. Her impulsive nature might be tempered by Aurora's more calm and collected demeanor. Together, they would support each other's development and become better rulers and partners.
Aurora might develop from a rather naive princess to a more worldly and confident queen. Her marriage to Ariel would expose her to new ideas and challenges, forcing her to grow. For example, she would need to learn about ruling an underwater kingdom as well as her own land. Ariel, on the other hand, could become more patient and understanding of land - based cultures. She would have to adapt to living in a castle and dealing with court politics.
One possibility is that their union could bring together two different magical worlds. Aurora, from a more fairy - tale like European setting, and Ariel, from an underwater kingdom. Their story could be about bridging the gap between land and sea, with them learning about each other's cultures. For example, Aurora could teach Ariel about the beauty of the forests and castles on land, while Ariel could introduce Aurora to the wonders of the ocean depths.
In a married life story, Kiba would develop a deeper sense of loyalty. His loyalty to Hinata would be on a whole new level compared to his loyalty to his friends or the village. He would be more protective and would do anything to keep her safe. Hinata would grow in her communication skills. Since Kiba is more outspoken, she would learn to express her feelings and thoughts more freely, which would also help her in her ninja work as she could better communicate with her teammates.
Arya would likely become more diplomatic. Since she's marrying Daenerys, she'd have to deal with more political situations. She might learn to use her skills in a different way, not just for revenge but for the good of the realm. Daenerys, on the other hand, would become more in touch with the common people through Arya. Arya's experiences growing up among the smallfolk would influence Daenerys's decisions.
Natsu would probably become more responsible. His wild and carefree nature might be tempered a bit by his marriage to Irene. He'd still be the same fun - loving guy but would also think about Irene and their relationship. Irene, on the other hand, might soften up. She was once a very powerful and somewhat cold character, but being married to Natsu could bring out her more caring and gentle side.
Ichigo would develop a more patient side. Halibel's different way of thinking and her more reserved nature would force Ichigo to slow down and really think about his actions. He would also become more protective, not just of Halibel but also of the new relationship they are building. Halibel would start to open up more. She was always a bit of an enigma in the original story. But in this fanfiction, being married to Ichigo would make her more expressive. She would start to share her thoughts and feelings more freely, and her character would become more complex as she tries to balance her old self with the new self that is influenced by Ichigo and his world.
Hilda, on the other hand, could become more confident and assertive. Being married to Beelzebub, she would likely be exposed to new situations and challenges that would force her to grow. She might also gain some of Beelzebub's more mysterious and alluring qualities as they spend more time together.
In married life, Eren could develop a more domestic side. She might start cooking for Levi, which is something new for her. Levi would have to adjust to having someone so close. He would learn to share his thoughts and feelings. He might also become more protective of Eren, especially if there are threats to their relationship or their lives. Their marriage would be a journey of mutual growth and understanding.
Naruko would likely become more mellow. With Sasuke by her side, she wouldn't feel the need to constantly prove herself as much. She might focus more on building a family and using her skills for the betterment of the village. Sasuke, on the other hand, would open up more. His cold exterior would soften as he experiences the warmth of a loving relationship. He would also become more involved in the village's affairs, not just for atonement but because it's now his home with Naruko.
Sakura would likely become more assertive in the relationship. She's used to being independent and now has to deal with sharing her life with Kakashi. For Kakashi, he might become more open. He has always been a bit of an enigma, but with Sakura in his life, he would have to let her in. He might start to show more of his emotions, especially when it comes to protecting their new - found relationship.
Peter Parker would likely develop in terms of his emotional maturity. Getting married would force him to be more responsible not just as Spider - Man, but also in his personal life. He might become more cautious about protecting his loved one. The other character, his spouse, could start as a fan - starstruck kind of person and then grow into a more confident partner, helping Peter in his superhero and normal life.