Perhaps his cleverness allows him to form an alliance with some of the less - liked magical creatures. He realizes that they have knowledge and abilities that can be useful. So, he befriends the house - elves and they help him with things like getting information from the Slytherin common room by using their ability to move around unseen. This way, Harry can stay one step ahead of his enemies and also learn about different aspects of the wizarding world that were previously unknown to him.
One plot idea could be that as Harry grows up clever, he quickly masters advanced magic spells much earlier than in the original story. For example, he might learn Patronus charm in his third year and use it to protect his friends in a more creative way, like using it to send messages through the form of his Patronus.
Perhaps Harry's time on the streets leads him to befriend a powerful but misunderstood magical creature that is feared by most wizards. This creature becomes his loyal companion and helps him in ways no human could. For example, it could have the ability to sense dark magic from afar, allowing Harry to be better prepared for Voldemort's attacks.
One interesting plot twist could be that they discover a hidden magic that binds their fates together from a very young age. This magic makes them able to sense each other's emotions and they have to learn to deal with this new connection while still being in the rival houses at Hogwarts.
One idea could be that the scarecrow comes to life and becomes a magical creature that helps Harry Potter in a dangerous task. Maybe it has the ability to sense dark magic and warns Harry of approaching threats.
Perhaps Orochi is a hidden figure in the history of the wizarding world that has been forgotten. Harry discovers some old texts in the Hogwarts library that mention Orochi in relation to a long - lost magical artifact. This leads him and his friends on a quest to find the artifact before it falls into the wrong hands, as it has the power to either control Orochi or be used by Orochi to gain ultimate power over the wizarding world.
One plot idea could be that Harry and Angelina team up for a special Quidditch training session for the younger students. They discover a new flying technique together that gives Gryffindor an edge in future matches. Another could be that they go on a secret mission within Hogwarts to uncover a hidden artifact that has been causing strange magical disturbances. And a third idea is that Angelina gets injured during a match and Harry uses some of his unique magical skills, learned from his various adventures, to help her recover faster than normal.
One idea could be a story where a character has a special power to resist Dementors' effects more than others. Maybe they discover a hidden spell or have a unique magical ability that they use to fight off Dementors when others are in danger. For example, a young witch or wizard who can emit a positive energy that counteracts the Dementors' despair.
One idea could be Norberta getting lost in the Forbidden Forest and Harry has to find her. Another could be Norberta growing ill and Harry, with his knowledge of magical creatures, tries to heal her. Maybe Norberta could get into trouble with some other magical creatures and Harry has to step in to protect her.
One plot idea could be that female Harry Potter, let's call her Hari, attends a Japanese wizarding school. There, she discovers unique Japanese magical creatures like the Kappa. She might struggle to adapt to the Japanese wizarding culture which is more honor - based compared to the British one. For example, she has to learn new spells with Japanese incantations and different wand - movements.
Well, a possible plotline is that they grow up and realize they have a shared passion for a particular type of magic, say, ancient rune magic. As they study it together, they start to understand each other better. Also, their families might slowly come to accept their friendship, which is a big deal considering the enmity between the Potters and the Malfoys.
A great plot for a Potter Manor fanfiction could involve a mystery that surrounds the manor. For instance, strange noises at night lead Harry to uncover a long - forgotten chamber. It could also be about Harry restoring the manor to its former glory, perhaps with the help of Hermione's research on ancient magic used in the construction of such manors.