To develop the characters, introduce conflicts within the family. For example, a child might feel neglected because Ron and Bonnie are too focused on each other. How they resolve this conflict will shape their personalities. Also, external factors like the children making new friends at school and how that changes their behavior at home can be used to develop them further in the fanfiction.
For Ron, you could show his growth as a father. Maybe he starts off being a bit clueless but learns to be more involved in the children's lives. Bonnie could be developed as the more organized parent, and as the story progresses, show her softer side when dealing with the kids.
To develop Ron's character, you could show his insecurities about becoming a father. Maybe he has a fear of not being able to provide for the family, so he starts taking on extra jobs or learning new skills.
I'm not sure if there is such a fanfic available online. Fanfics can be quite diverse and spread across many different platforms. You could try searching on popular fanfic websites like Archive of Our Own or FanFiction.net.
Another plot could be that Ron and Bonnie decide to have a big family event. The children all have different expectations and feelings about it. As they plan the event, secrets from the past are revealed that either strengthen or strain the family bonds.
Well, it could be about Bonnie and Ron building a family life together with their children. Maybe they face challenges in raising the kids, like dealing with school problems or family disputes.
Bonnie might be shocked. She could react with disbelief at first, thinking it's some sort of joke or a plot by villains. But as she realizes it's real, she might become a bit envious if she had feelings for Ron or simply be very confused about how such an unlikely pair got together.
Well, perhaps Bonnie finds out during her pregnancy that Ron has been keeping a big secret from his past, like a previous relationship that he never fully disclosed. This could lead to a lot of drama and conflict between them. They would have to work through it while also preparing for the new baby.
To develop Foxy's personality, we could show his loyalty. If there's a situation where Bonnie or the human is in danger, Foxy is the first to jump in and defend them. He could also have a bit of a temper at times, which adds depth. Bonnie can be the more gentle and empathetic one. He's always there to comfort the human when they're feeling down or out of place. The human's personality could be shaped by their experiences in this new world. They might start to take on some of the traits of Foxy and Bonnie as they bond with them.
To develop Jeremy, you could explore his past traumas and how Bonnie helps him overcome them. This would show his character arc. He could start off as a broken person and slowly heal. For Bonnie, you can focus on her family background. Maybe she comes from a family of powerful witches and she has always felt pressured. Jeremy becomes the person she can relax with. They both grow as they learn more about each other's insecurities and dreams.
A really interesting plot twist could be that Ron and Bonnie's marriage is part of a magical prophecy that neither of them knew about. And as they start to figure it out, they discover that they have a much greater role to play in the wizarding world. This could involve them having to face some ancient evil that the prophecy is linked to, and their relationship would be tested in the process. It would add a whole new layer of adventure and mystery to the fanfiction.
Perhaps in this fanfiction, Ron and Bonnie are happily married but then Shego shows up pregnant. It could turn out that the baby has some sort of special power or connection to their world. Ron, with his experience in dealing with strange situations, might take it upon himself to protect Shego during her pregnancy. Bonnie could be initially jealous or suspicious but then grows to care for Shego as they realize they are all in this together. And the story could revolve around their journey to discover the origin of the baby and keep it safe.