One possible plot could be that Harry gets braces during his time at Hogwarts. His friends might tease him a bit at first, but then they get used to it. Maybe the braces have some magical properties, like they glow when he's near a powerful magical object or they help him with his spells in a unique way.
In the 'Harry Potter gets braces' fanfiction, it could be that Harry's braces are a part of a new Muggle - wizarding world exchange program. A Muggle dentist accidentally uses a magical tool on Harry's teeth while he's on a visit to the Muggle world. This causes his braces to have some really strange effects at Hogwarts, like they can translate ancient runes when he bites down on them in a certain way.
Maybe it could be about Harry's insecurities at first with getting braces. He might be worried about how his friends will react, especially if he has a crush on someone at Hogwarts. But then as the story progresses, his friends support him and he learns to embrace his new look.
Maybe it could be about Bella's journey of getting used to having braces. For example, she might initially feel self - conscious, but then she discovers new confidence as she sees the positive changes in her teeth over time.
Ron would also be a main character. He might start off by making fun of Harry's braces, but then he would stand up for Harry when some of the Slytherins start to bully him because of it. Ron could also try to use the braces to his own advantage in some comical ways, like using them as a slingshot for Bertie Bott's Every Flavour Beans.
Hermione would definitely be one of the main characters. She could be the one to research all about braces in the wizarding library to see if there are any magical implications or ways to make the process easier for Harry. And she would offer him lots of advice and support.
Well, the plot could be that Harry discovers a snake in the Forbidden Forest. The snake might be a magical one with special powers. Maybe it can communicate with Harry in Parseltongue and help him find hidden secrets in Hogwarts. For example, it could lead him to a long - forgotten chamber that holds ancient magic spells.
Well, it could be about Harry getting really frustrated with all the pressure at Hogwarts and making some bad decisions that lead him down a dark path for a while. Maybe he starts skipping classes and getting into trouble with the professors more often.
Well, one possibility is that Harry gets a tattoo to symbolize his journey. Maybe it's a lightning bolt on his wrist, representing his scar and the battle against Voldemort. It could be a secret among his friends at first, and they discover it during a Quidditch celebration.
Well, it could be that the trunk is a magical trunk with all sorts of hidden compartments and powers. Maybe it has a self - cleaning function, or it can transform into a small shelter when Harry is in danger. It could also be filled with rare magical items that help him in his adventures at Hogwarts.
Well, perhaps Harry Potter could get a cybernetic arm after an encounter with a dark wizard's spell that damages his original arm. This new cybernetic arm could have special powers, like being able to detect dark magic. It would change the way he interacts with the magical world and his dueling techniques.
In this fanfiction, perhaps the howler scolds Harry for something he did that he thought was right but others disagreed. Maybe it's about his actions during a Quidditch match that were considered too risky. The howler could be from McGonagall, for example.