With Ron, it could be a bit more complex. Ron might initially be a bit jealous that Harry is getting so much attention because of his de - aged state, but then they could bond over Harry's new - found naivete. They might end up having more light - hearted adventures together in the lead - up to the tournament tasks.
His relationships can become more innocent. For example, with Hermione, she might be more protective of him as if he were a little brother. Instead of their usual intellectual banter, she could be guiding him more.
One interesting plot twist could be that the de - aged Harry has some hidden memories of the future that help him in the tournament in unexpected ways. For example, he might remember a particular spell that an opponent will use and be able to counter it easily.
With Natasha, she might become more protective of Steve. In his de - aged state, she could see him as someone who needs more safeguarding, and their friendship could deepen as she shares her own experiences to help him adapt.
If Naruto gets de - aged, his friends would likely become very protective of him. For example, Sasuke might feel a stronger sense of responsibility to keep Naruto safe, since Naruto is now in a more vulnerable state. Sakura would probably mother him a bit, making sure he eats well and studies hard at the academy. His friends' perception of him would shift from seeing him as an equal or even a leader in some cases, to seeing him as someone who needs their care and guidance.
With his colleagues, like Dumbledore. When de - aged, Snape might be more open and less guarded. He may share his true feelings and thoughts more freely. Dumbledore might have to take on a more fatherly role towards him, guiding him through the challenges of being de - aged. And with the other Hogwarts professors, he could form new alliances or rivalries based on his new, younger self.
In most cases, a de - aged Harry makes the Drarry relationship more innocent at first. Draco might see Harry in a new light, as someone who needs protection or guidance. It softens Draco's usual tough exterior towards Harry.
Harry Potter himself is quite popular. Since he's the main character, seeing him in a de - aged state offers a lot of storytelling possibilities. Hermione Granger is also a common choice. Her intelligence at a younger age could lead to different adventures. And then there's Draco Malfoy. Writers like to explore his character when de - aged as it gives a chance to rewrite his early interactions with the other characters in a new light.
In fanfictions, the 'Harry Potter de - aged' concept usually involves some sort of magic gone wrong or a powerful spell. For example, a dark wizard could cast a spell that backfires and de - ages Harry. Or it could be an experimental spell by a well - meaning but inexperienced wizard.
There are not many well - known fanfictions with this exact premise. However, you could try writing your own. Start by thinking about how Voldemort was de - aged. Was it a spell gone wrong? Or a magical experiment? Then consider Harry's reaction. Would he be immediately distrustful or would there be some sort of instinctual connection? You could also think about the implications for the wizarding world. How would Dumbledore react? And what about the other Death Eaters? If you don't want to write it, keep searching on fanfiction archives. Check for new and updated stories regularly as new fanfictions are being added all the time.
You can start by looking on fanfiction websites like Fanfiction.net or Archive of Our Own (AO3). Just use the search bar and type in 'de aged Harry fanfiction'. They have a wide range of stories with different takes on the concept.
One great 'de aged Harry fanfiction' is 'The Younger Potter'. It shows a really interesting take on Harry being de - aged and how the other characters interact with this younger version of him. The author does a wonderful job of maintaining the essence of the Harry Potter world while adding this unique twist.