There are many potential teachers in fanfiction for Harry's private lesson. One option could be a time - traveling wizard from the future. This wizard could see that Harry needs certain skills to face future challenges and come back to teach him. Or it could be a wizard who has been in hiding for a long time, with a vast amount of knowledge about ancient magic that he imparts to Harry during the private lesson.
Well, in the private lesson in fanfiction, he could have one - on - one time with a powerful wizard or witch. This might lead to him getting insights into the wizarding world's secrets. Maybe he'd learn about hidden magical places or the true nature of certain magical artifacts. It could also be a time for him to develop his personal magical style, different from what Hogwarts usually teaches.
Snape could also be the one to teach Harry a lesson. Given their complex relationship in the original books, in fanfiction, Snape might see an opportunity to put Harry in his place. For instance, if Harry fails in a potions class because of his carelessness, Snape could use this as a chance to teach him about discipline and attention to detail.
Maybe Professor McGonagall. She was strict but also had a soft spot for Harry. She might take Harry under her wing more in this fanfiction and make him her 'pet' student. She could teach him advanced Transfiguration skills or involve him in Gryffindor - related leadership tasks that give him an edge over the other students.
It could be a mix of students from different houses. In Hogwarts, students from all four houses come together for classes. Harry, having experienced the unity and rivalry among the houses, would be able to handle the diverse group of students well. He might encourage more inter - house cooperation in his classes, breaking down some of the traditional house rivalries.
Another challenge for Harry as Dada teacher could be dealing with the school's bureaucracy. He might want to introduce new teaching methods or change the curriculum, but he has to go through the proper channels. And there could be resistance from some of the more conservative teachers or the school administration who are used to the old ways of teaching Dada.
It could be his loyal owl, Hedwig. She might be staying with him in the attic, providing comfort and also being a messenger for him when he needs to communicate with his friends outside.
One potential private tutor could be a retired Auror. They would have a wealth of knowledge about the Dark Arts and how to combat them. They could pass on their skills in dueling and detecting dark magic to students like Harry Potter.
He might learn a lesson about the consequences of recklessness. For example, if he rushes into a dangerous situation without proper planning, he could face serious setbacks or endanger his friends. This would teach him to think before acting.
Well, in fanfiction, Neville Longbottom could be one of the visitors. He and Harry could exchange gardening tips as they explore the manor's gardens. Additionally, Dumbledore's portrait might be magically transported to Potter Manor, and he could offer his wisdom and guidance to Harry as he lives in the manor. And of course, Hagrid might come with some magical creatures to show Harry, adding more excitement to the manor.
His friends from Hogwarts, like Ron and Hermione, are likely to help. Ron could bring his family's practical knowledge of wizarding homes and Hermione would contribute with her extensive research skills.