Let me recommend a few books! The first is "A Certain Esoteric Sect Master of Hogwarts". This light novel-derivative fanfiction is about the adventures of an eleven-year-old Junefer Grier at Hogwarts. I believe you will like it very much! Next up was Hogwarts and the Necromancer's Growth Manual. This book was also a light novel, a derivative fanfiction, mainly about a reserve-duty mage. There was also 'As an Immortal, I Reincarnated as a Muggle'. This book was also a doujinshi novel, and the main character was an immortal who was reincarnated as a Muggle. All three books were related to Harry Potter. Of course, there are many other good books about Harry Potter, such as Dragonborn at Hogwarts, Hogwarts Summoning Guide, etc. You can try to read them ~ I hope you like this fairy's recommendation, muah ~