One plot idea could be Harry dealing with the extra responsibilities of being Head Boy during a time of unrest in Hogwarts, like when there are rumors of a new dark threat. He might have to balance his regular studies, his role as a friend to Ron and Hermione, and his new duties. Another could be Harry using his position to reform some of the old, unfair school rules that have been in place for ages.
A really interesting plot could be Harry as Head Boy having to work closely with a Slytherin Prefect who he initially distrusts. But as they work together on projects for the school, like preparing for the Triwizard Tournament (even if it's a non - official one in the fanfic), they start to understand each other better and break down house rivalries. Also, he could use his influence to start a new club in Hogwarts that focuses on teaching defensive magic to all students regardless of their year or house.
Well, imagine Harry as Head Boy during his seventh year. He discovers a hidden chamber in Hogwarts that was previously unknown. As Head Boy, he has the authority to explore it further. Inside, he finds ancient spells and artifacts that could potentially change the wizarding world. He has to decide whether to share this discovery with the school authorities or keep it a secret for a while to protect it from falling into the wrong hands. This could lead to a whole adventure where he enlists the help of his friends and even some unexpected allies within the school.
One idea could be that the Head Boy has to deal with a secret society within Hogwarts that is causing chaos. Maybe they are trying to bring back an old dark magic spell. Another could be that the Head Boy discovers a hidden room in Hogwarts that holds the key to an ancient mystery related to the founders of the school. He then has to protect this secret from those who might misuse it.
A plot could be the Head of Gryffindor having to deal with a rivalry between Gryffindor and Slytherin that gets out of hand. They would need to find a way to calm the students down and promote unity among the houses.
Well, one interesting plot could be the Head Boy having to deal with a new dark magic threat within the school that the teachers are unaware of. He has to secretly gather allies among the students to fight it.
Well, a plot could involve the baby boy being a huge Harry Potter fan in a world where magic is real but not as well - known as in the books. The daddy, who doesn't believe in magic at first, is then drawn into the magical world because of his son. They could go on adventures to find hidden magical places, similar to the places Harry and his friends discover in Hogwarts.
One idea could be a head of house having to deal with a new and dangerous dark magic threat within their own house. Maybe the head of Gryffindor discovers that some students have been dabbling in a forbidden spellbook. Another could be a head of house trying to organize an inter - house tournament to boost morale and unity among the students, but facing opposition from other heads of house who think it's too risky. And a third idea might be a head of house uncovering a long - lost secret about their house's founder that changes the way they view their role and the traditions of the house.
Perhaps a fanfic where Lily Potter's spirit is able to communicate with Harry Potter during his difficult times at Hogwarts. She gives him advice and guidance that helps him through his struggles, like dealing with Snape's complex feelings towards him, or facing the challenges of the Triwizard Tournament. This would add an emotional and magical element to Harry's journey.
One idea could be that the Head Goblin discovers a long - lost magical artifact hidden deep within the vaults of Gringotts. This artifact has the power to change the balance of magic in the wizarding world. Another could be that the Head Goblin forms an unlikely alliance with Harry Potter to protect Gringotts from a dark wizard who wants to steal all the gold and magical items stored there. Or perhaps the Head Goblin has a secret past related to Harry's family, and this connection unfolds throughout the fanfiction.
One plot idea could be that Crookshanks discovers a hidden passage in Hogwarts that leads to an ancient wizarding library. He then leads Hermione to it, and they find a powerful spellbook that helps them in their fight against the dark forces. Another could be that Crookshanks has a secret ability to communicate with other magical creatures in the Forbidden Forest and he enlists their help to save Harry from a dangerous situation. Maybe he can talk to the centaurs and they come to the rescue when Harry is surrounded by Death Eaters.
One idea could be exploring Bellatrix's backstory before she became a Death Eater. Maybe she had a complex relationship with her family that led her down the dark path. Another could be a story where she has a change of heart, perhaps due to an unexpected encounter with a character like Harry Potter. For example, she could see some of her own past self in Harry and start to question her loyalty to Voldemort.
Maybe a fanfic where the goblins of Gringotts go on strike. Since Harry has some influence with them due to his own vault and his adventures there, he gets involved in the negotiations. Along the way, he uncovers a plot by some Death Eaters who are trying to take advantage of the chaos to steal valuable magical artifacts from the bank. It would be a mix of politics, mystery and action.