Well, perhaps it could start with a magical mix - up. Maybe a spell gone wrong during a big wizarding event. They could wake up one day and find out they are magically married. Then they have to deal with the shock of it all, and try to figure out how to reverse the spell while also facing the reactions of their friends and the wizarding community.
The story could begin with a misunderstanding in a very complex magical ritual. Harry and Newt find themselves accidentally married. At first, they are both very confused and a bit angry. But as time passes, they start to see the positive sides. They start to support each other in their respective works, Harry with his fight against the dark forces that still lurk and Newt with his care for magical creatures. However, they still keep looking for a solution to end the accidental marriage, but not without some interesting adventures along the way.
In such a fanfic, it might be that a mischievous magical artifact causes their accidental marriage. They would then need to go on a quest together to find a way to break the bond. Along the way, they discover new things about each other and form an unlikely friendship. They also have to deal with the media in the wizarding world, like the Daily Prophet writing wild stories about them.
At first, it would be really awkward. They are from different worlds in a way. Harry is more into fighting dark wizards, and Newt is all about magical creatures. But as they are forced to be together due to the accidental marriage, they might start to respect each other's passions more. They could learn from each other, like Harry learning about magical creatures from Newt, and Newt learning some combat skills from Harry.
In a 'Harry Potter adopted by Newt' fanfic, perhaps Newt gets a mysterious message about a powerful but troubled young wizard. When he finds Harry, he realizes that the boy has a connection to the magical creatures world that he doesn't yet understand. Newt takes Harry under his wing. Harry gets to live in Newt's home, which is filled with all sorts of amazing and dangerous creatures. He learns about their habitats, behaviors, and how to communicate with some of them. This knowledge and his bond with Newt could change the way he approaches challenges at Hogwarts and in the wizarding world as a whole.
Well, perhaps it could start with some sort of magical mix - up. Maybe a spell gone wrong during a celebration. Harry and Blaise could find themselves suddenly married. Then they'd have to deal with the shock from their friends and family. For example, Hermione might be very confused and Ron could be outright shocked.
In such a fanfic, perhaps Ginny uses some kind of magical coercion. Maybe she has found a powerful spell that bends Harry's will just enough to make him agree to the marriage. It could also be that she manipulates a situation where Harry feels he has no other choice but to marry her, like threatening to expose a secret of his that could harm his reputation.
One possible plot twist could be that Newt's magical creatures somehow get involved in the events at Hogwarts. For example, a Niffler might steal an important magical item from Hogwarts and Newt has to come to retrieve it while also dealing with the chaos of the school environment. Another could be that Newt discovers a new species of magical creature that has a connection to the Dark Arts in the Harry Potter world, and he has to work with Harry and his friends to figure out how to deal with it. And perhaps there could be a time - travel element where Newt travels back in time to meet the founders of Hogwarts and this has implications for the present - day wizarding world in the Harry Potter universe.
One possible plot twist could be that Harry initially resists the marriage wholeheartedly. He might see it as a ploy by the Malfoy family. But as he gets to know Draco better during the pre - wedding preparations, he discovers that Draco is also a victim in this situation. They could then start to form an alliance against Narcissa's overbearing plans.
A powerful and ancient magical being might force Harry to marry. This being could have its own motives that are not immediately clear. It could be related to some prophecy or an old magical law that only this being knows about. Harry would then have to figure out the nature of this being and how to persuade it to release him from the forced marriage.
One possibility could be that Jiraiya is under the influence of a powerful enemy's jutsu that makes him lose control of his actions and accidentally attacks Naruto. This could lead to a great deal of guilt and self - loathing for Jiraiya later.
For Harry, he may face a lot of criticism from his friends and the wizarding community. They might see him as a heartbreaker or someone who doesn't value his relationships. This could lead to a strain on his friendships, especially with the Weasley family who he is very close to.
One great 'Harry Potter Newt Scamander Fanfic' is 'The Adventures of Newt in Post - War Hogwarts'. It shows Newt's interactions with the students and how he imparts his knowledge of magical creatures. Another one could be 'Newt's Secret Journeys', which delves into his unrecorded travels and encounters. There's also 'Newt and the Cursed Artifact' where he has to solve a mystery involving a dangerous magical item.