Yes. The Nagatoro manga reached its end, giving fans a sense of closure. There might be some mixed feelings among readers, but the final chapters tied up loose ends.
One of the main themes is the complexity of human nature. Izaya is a character who manipulates others, and through his actions, we see how people can be both good and bad, and how easily they can be influenced. Another theme is the concept of chaos and order in a city like Ikebukuro, where Izaya's actions often stir up trouble and disrupt the normal flow of things.
One common theme could be self - discovery. Since Izaya is a complex character, a female version might also go through a journey of understanding herself.
Yes, the Nagatoro manga has ended. It might have left fans with a mix of emotions, but it provided a definitive conclusion to the tale that had been unfolding.
One popular Izaya Orihara light novel is 'Durarara!!'. It's a great read as it delves deep into the complex character of Izaya. The story is set in Ikebukuro and is filled with various sub - plots and interesting characters that interact with Izaya in different ways, making for a very engaging narrative.
I'm not sure if there is such a specific fanfic. There are countless fanfics out there, and while crossovers between different series like 'Durarara' and 'Harry Potter' are possible, and a character like Izaya Orihara being a fan in that context is a very niche idea. It would be quite difficult to find without extensive searching through various fanfic platforms.