There are 'alienist fanfic' that center around the relationships between the characters. Some might focus on the friendship between Kreizler and Moore, and how it developed over time. These fanfics can add new layers to their bond, showing different aspects of their trust and mutual respect that might not have been fully explored in the show or book.
The Alienist isn't true. It's a made-up story that combines elements of mystery and drama to entertain readers/viewers. There's no real-life basis for it.
The 'Alienist' is purely fictional. It's the product of the author's imagination and not based on real events or people. However, it might draw inspiration from historical contexts and themes to add depth and authenticity to the narrative.