In the fanfiction, during 'Sitch in Time', they could develop a more equal partnership. In the original, Kim is often the more dominant one in their adventures. But in this fanfiction, the time - traveling situations could force Ron to step up more. This new dynamic of equality could lead to a different kind of relationship development, with them respecting each other's skills and ideas more and becoming closer in a different way than in the original story.
Perhaps in the fanfiction, the time - traveling in 'Sitch in Time' causes some sort of glitch in their relationship. Ron might remember events from a future timeline where he and Kim had a falling out. This makes him act distant towards Kim in the present, which she doesn't understand at first. As they work through the 'Sitch in Time' adventure, they have to also repair their relationship and figure out what went wrong in that future timeline.
Their relationship could develop more quickly in the fanfiction. For instance, during the 'Sitch in Time' events, they might have a moment of realization where they understand their feelings for each other more deeply due to the high - stakes time - traveling situation. They could start to act more like a couple earlier than in the original story.
Monkey Fist is often a popular choice. His villainous nature and his connection to martial arts and ancient artifacts can add a lot of intrigue to a time - travel based fanfiction. He could be chasing Kim and Ron through different time periods, trying to steal some powerful relic.
Maybe in the fanfiction, Kim and Ron find a hidden power within the time - traveling device during 'Sitch in Time'. This power allows them to visit different key moments in their past adventures but also attracts the attention of a new villain who wants to steal this power for their own evil plans. So they have to protect this power while still trying to fix any disruptions in time.
One idea could be that Kim and Ron get stuck in a time loop within a particular historical event. They have to keep reliving the same day until they figure out how to correct an anachronism that's disrupting the time - space continuum. Another could be that they travel to the future and see versions of themselves that have changed in unexpected ways due to different life choices.
His character could develop a sense of urgency. Knowing that he died in his original timeline, he would want to make the most of his second chance. He might become more of a leader, taking charge in situations where he previously would have held back. He could also become more empathetic, as he has seen the consequences of his actions in the past life.
In a fanfic where they meet before Hogwarts, they could have a different kind of bond. Maybe they end up having a little adventure together in their hometowns. This shared experience would make their relationship deeper. When they get to Hogwarts, they would already be best friends instead of just becoming friends on the train journey. They would also be more likely to support each other in different situations right from the start of their Hogwarts years.
If they travel to the past, Kakashi might see Sakura in a new light. In their original time, he saw her as a student, but in the past, she could show different skills and a more mature side, which could make him respect her more as an equal. Their relationship could become more of a partnership rather than a teacher - student dynamic.
There would be a new level of intimacy. Sharing the experience of raising a child would bring them closer in a different way. They'd have to communicate even better about things like the baby's needs, finances for the baby, and their own hopes and dreams for the child. They might also argue more over parenting styles, but this would also be a chance for them to grow and understand each other better.
Their relationship could develop through shared interests. For instance, if they both have a passion for magical inventions, they might start collaborating on some small projects at home. This would lead to them spending more time together and getting to know each other better.
Perhaps in this fanfiction, Kim might lose some of her powers during the time - traveling adventures in 'a sitch in time 2'. She then has to rely on her wits and the help of her friends like Ron and Rufus in a more creative way. For example, she might use her knowledge of history to outsmart the bad guys instead of just relying on her usual martial arts and gadgets.
In a time - travel situation, Orihime could have a chance to understand Ulquiorra better. She might see his past and the events that shaped him into the being he is in their original timeline. This new understanding could lead to a deeper emotional connection between them. She could start to see him not just as an enemy but as a complex being with a tragic past, which would change the way she interacts with him.