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.
One interesting plot could be a tutor helping a Hogwarts student master a difficult subject like Ancient Runes in a very unorthodox way. Maybe the tutor has a unique magical ability that they use to make the learning process more engaging.
I think Dumbledore might be a candidate in the fanfiction. He's the most powerful wizard of his time and could offer Harry deep insights into magic, history, and the fight against the dark side. Also, Luna Lovegood could be a tutor in her own strange but brilliant way. She has an unconventional view of magic that might open new perspectives for Harry. Then there's Sirius Black. He could teach Harry about the wizarding world outside of Hogwarts and some spells and tricks he learned during his time as a fugitive.
One important area would be Occlumency and Legilimency. Since Harry has had issues with his mind being invaded in the past, the tutors could help him master these skills. They could also teach him about different magical cultures. For instance, about the goblin culture, their magic with metals and treasure - related spells. And of course, the tutors could enhance Harry's knowledge of magical creatures, how to interact with them, and use their abilities to his advantage.
It could be an old, retired Auror. They would have a wealth of practical knowledge about magic and how to use it in dangerous situations. They could teach Harry how to sense dark magic and protect himself better.
Hermione Granger could be a great candidate. She is extremely intelligent, has a deep understanding of the wizarding laws (from all her studies), and is very determined. She could use her knowledge to fight for justice as a private lawyer. Her Muggle - born background might also give her an edge in dealing with situations that require a different perspective from the traditional wizarding view.
Hermione Granger is often a popular character in such fanfiction. Her intelligence and thirst for knowledge make her a great private investigator. She can use her vast knowledge of magic and her research skills to solve mysteries.
I recommend the following novels to you:
1. "The Storm of the Ultimate Class One Four"-a light novel-a doujinshi derivative novel. It was about the story of Jiu Wu and Ding Xiaoyu hiding their identities in the golden space-time and exploring the mysteries of the ultimate series.
2. "Ultimate Series: I'm the Storyteller, Exposing the KO List"-an urban novel. The main character has a storyteller system and tells the story of his experiences in the Ultimate Series.
3. "The Zither Player from Douluo"-Light Fiction-derived Doujinshi novel. The story of the protagonist playing the zither on Douluo Continent.
4. "A Little Too Many Daily Quests of Tutoring"-Light Fiction-derived Doujinshi novel. The main character completes all kinds of strange missions as a tutor.
I hope you like my recommendation. Muah ~
One interesting story could be about a private investigator in the wizarding world trying to solve the mystery of disappearing magical artifacts. The investigator might be a new character who uses both magic and detective skills to follow leads.
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.