In fanfiction, their interaction can be really diverse. Some stories might have Harry and Grindelwald engage in a battle of wits rather than just a physical battle. Harry could use his knowledge of Dumbledore (who had a history with Grindelwald) to try and outmaneuver him. It's an interesting way to show the intellectual side of the wizarding world battles.
Often, fanfiction depicts their interaction as intense. Harry, being the hero, is usually in opposition to Grindelwald's dark plans. For example, he might try to stop Grindelwald from gathering more followers or retrieving some powerful dark artifact.
At first, it might be a relationship based on Grindelwald's self - serving motives. He sees Harry as a tool. But as they spend time together, there could be moments of mutual understanding. Harry might start to see Grindelwald not just as a villain but as someone with complex ideas.
In some fanfictions, the relationship between Harry Potter and Grindelwald can be quite complex. Sometimes, authors might explore a scenario where Harry has to confront Grindelwald's ideology in a new way, different from what we see in the original series. It could be a way to show Harry's growth and his ability to face different forms of dark magic.
Some writers depict Tom Riddle as a menacing presence. He might lurk in the shadows when child Harry is around, observing him with his cold eyes. Harry, in turn, might sense this malevolent force without fully understanding it yet.
Grindelwald's character might also develop in fanfiction by having a redemption arc. He could be influenced by Harry Potter's ideals of love and friendship. For instance, after a series of battles and discussions with Harry, he starts to question his own beliefs and gradually moves towards the light side.
His relationships with the other characters are also altered. Dumbledore, for example, had a big role in Harry's life in the original story. But if Harry is Grindelwald's son, Dumbledore's attitude towards him might be more complex. Dumbledore had a history with Grindelwald, and this new connection could make Dumbledore both more protective and more wary of Harry. The same goes for other characters like Snape. Their interactions with Harry would be colored by this new family connection.
Often, Harry's knowledge of fighting in fanfiction comes from intense self-study and practice, as he realizes the importance of being well-prepared for the challenges ahead.
Harry could also develop a more self - reliant and perhaps a bit of a loner personality. Since Grindelwald is not as nurturing as some other potential guardians, Harry would have to fend for himself more often. This would make him stronger in some ways but also more aloof from others, as he would be used to relying on his own skills and judgment rather than on a community or friends.
Fanfiction often depicts their relationship as very passionate. They are shown as being deeply in love and constantly stealing glances at each other in the hallways or during classes. For example, they might share secret smiles during a particularly boring Potions class.
In some fanfictions, it might be possible for Harry Potter to be depicted as the heir of Grindelwald. Fanfiction allows for a lot of creative interpretations. However, this goes against the original canon where there is no such indication.
Yes. In some fanfictions, the author might create an interesting plot where Harry Potter is shown as a fan of Grindelwald for various reasons. Maybe it's due to Grindelwald's powerful magic that Harry is intrigued by, or perhaps the author wants to explore a more complex relationship between the two characters outside of the original canon.