Alex could develop a deeper sense of responsibility. Since he is now part of Fluttershy's life which involves taking care of so many things, he has to step up. Fluttershy, on the other hand, might become more outgoing as she has Alex to introduce her to new things. They both could learn to compromise more in their relationship, which is a big part of character development in a married - life scenario.
For Alex, he might become more empathetic towards animals and nature, influenced by Fluttershy. He could start to see the world from a more gentle and caring perspective. For Fluttershy, she might become more confident in dealing with the outside world, with Alex by her side.
In this fanfiction, Alex may start as a rather rough - around - the - edges character. But through his relationship with Fluttershy, he polishes his edges. He becomes more patient and less impulsive. Fluttershy may grow bolder in expressing her opinions, especially when it comes to protecting their relationship and their home. Also, they both could develop a stronger sense of unity, always having each other's backs in any situation that arises.
One possible plot could be that they first meet in a magical forest. Alex is charmed by Fluttershy's kindness towards the animals. They start to spend more time together, going on picnics by the stream. As their relationship grows, they face some challenges like misunderstandings from their friends who don't initially understand their bond. But they overcome these through honest communication and finally get married in a grand ceremony with all their friends and the forest animals in attendance.
Gaara might start to show more of his soft side. With Sakura by his side, he could become less isolated and more involved in the social aspects of his village. His leadership style could also change, becoming more collaborative. Sakura, she would become more in tune with the desert environment and the needs of the Sand Village. She would probably develop her fighting style to incorporate some of the Sand techniques, which she learns from Gaara. Also, her understanding of love and family would deepen as she builds a life with Gaara.
Winter might become more open and less rigid. Being married to Jaune, who is more carefree, could encourage her to let loose a bit and show her softer side more often. For example, she might start to enjoy simple pleasures like picnics, which she never considered before.
Jackson could develop more patience. Since April might have her own quirks and ways of doing things, he would need to be more patient in their married life. For example, if she is very particular about how the house is organized. April could become more confident. With Jackson's support, she might feel more self - assured in her decisions, both in their relationship and in other aspects of her life. For instance, she could take on more leadership roles at work.
In this fanfiction, Setsuna might develop a new - found sense of stability. His relationship with Marina and their marriage gives him a home and a family in a sense. He could become more protective, not just of Marina but also of the life they are building together. Marina could develop a deeper understanding of Setsuna's past traumas and how they shape him. This understanding could lead her to be more empathetic and also help her in guiding Setsuna towards a more healed and whole self as they navigate their married life.
Domon might become more gentle and understanding as he adapts to married life with Rain. He could learn to communicate better and be more open about his feelings.
For Percy, he might become more responsible. Marriage would mean he has to think about not just himself and his friends, but also his partner Reyna. He could develop better leadership skills as he and Reyna might need to lead their family or even the demigod community together. Reyna, on the other hand, could become more open - hearted. She has always been a bit guarded, but with Percy as her husband, she might let her walls down more often. She may also develop a softer side, especially when it comes to dealing with Percy's more impulsive nature.
For Izuku, he might become more confident in his personal life. Marriage to Ochako gives him a sense of stability and he starts to show more leadership not just in hero work but also in his family life. He could also become more expressive of his emotions. Ochako, on the other hand, may develop a stronger sense of responsibility towards their relationship. She might be more assertive in her decisions and support Izuku in a more vocal way. For example, when Izuku is doubting himself in a tough hero mission, Ochako is there to boost his confidence.
Peter Parker could develop into a more responsible and family - oriented person. With Tala by his side, he might start to think more about the future and creating a stable life. He may also become more open about his emotions and rely on Tala for support in ways he didn't before.
Amu might develop a stronger sense of responsibility as a wife. She could start to think more about their future together, like planning for a family or building a home. Ikuto, on the other hand, could become more patient. He was always a bit of a lone wolf, but now he has to consider Amu's feelings and needs all the time, which would change his impulsive nature.