Well, it shows a more domestic side of their relationships. For example, they might share clothes or tease each other about their crushes like siblings do. It's not just about fighting Voldemort but also about the little everyday things that siblings experience.
In this type of fanfiction, their loyalty to each other is shown in a more family - oriented way. They might get angry with each other for things like one of them not sharing secrets right away, but then quickly forgive because they know they're family. It gives a different depth to their connection compared to just being friends in the original story.
One interesting plotline could be the trio getting into a big argument over something silly, like who gets the last piece of treacle tart, just like real siblings would. Then they have to make up and realize their bond is stronger than such small disagreements.
Fanfictions often explore Hermione's character as being more in touch with her emotions during pregnancy. In 'Hermione's Journey to Motherhood', she is not just the brainy witch but also a woman dealing with hormonal changes. Ron is shown as growing in patience. He has to deal with Hermione's mood swings and still support her. This is different from his more impulsive self in the original books. He becomes a stable presence for Hermione.
The fanfiction might explore Naruto's impulsiveness in a new way. If he has animal traits, his impulsive actions could be more instinct - driven, like a wild animal going after its prey without thinking much. For Sakura, her usually calm and composed self could be challenged by her animal side. For instance, if she's part deer, she might have a fight - or - flight response that she has to control in battle situations.
In a pregnant fanfiction, Tamaki's character can show a more mature and responsible side. Normally he can be a bit flamboyant, but with Haruhi pregnant, he has to step up. For example, he might start thinking more about financial stability for their family.
Their relationships could develop in many ways. For starters, Harry might look up to James as a father figure he never really got to know. James, in turn, would be proud of his son. Sirius could become like an older brother to all three of the Golden Trio. He'd be protective and also share his wild stories with them. Remus would be a great source of wisdom for them, and Hermione would especially appreciate his knowledge. Ron might be a bit in awe of the Marauders at first, but soon they'd all be joking around like old friends. The relationships would likely be based on mutual respect for their different skills and the common goal of making the wizarding world a better place.
In this fanfiction, the tie - switch can be a tool to explore their insecurities. Harry might feel a bit self - conscious wearing Draco's tie, worried about what it says about him. Draco, on the other hand, might be afraid of losing his 'pure - blood' image if his tie is on Harry. This can lead to some great character - development moments.
The fanfiction could explore Hermione's character through her attraction to the forbidden. Peter Pettigrew represents something she should stay away from, but the lemon aspect implies a physical and emotional attraction. This could lead to her exploring a side of herself that she has always suppressed. For Peter, it could be a chance to be more than just the pathetic character he is known as. Maybe Hermione's belief in him makes him want to be a better person, and this change is explored through their relationship. The fanfiction can take their characters out of their normal narrative boxes and show new facets of them.
Well, it might show Bella Swan as more assertive in her feelings compared to the original. As for Charlie, it could depict him as having more complex emotions towards Bella. For instance, Charlie may have a deeper understanding of Bella's inner turmoil.
The time travel could put some strain on their relationships at first. Harry might be more focused on seeing his godfather again, Ron could be a bit jealous if Harry's attention shifts too much, and Hermione would be constantly worried about the rules of time travel. But as they work through these issues, they'd likely come out with a deeper understanding and respect for each other. They'd also have to hide their true identities from the people in that time, which would require a lot of trust among them.
It might show the more playful side of characters like Optimus Prime. Usually seen as a serious leader, in the fanfiction he could be shown enjoying the games and showing a sense of humor. This gives a new dimension to his character.