It's a unique take on the Gravity Falls universe. It likely involves an alternate version of the story, with different character dynamics and plotlines in a visual novel format.
I don't know as I haven't read this 'dragon reverse scale novel'. But typically, in a dragon - related novel, there could be a brave hero or heroine, a wise old wizard perhaps, and of course, the dragon itself.
I recommend "The Self-Help Manual for the Dark Villain in the Book of Traversal". The main character of this novel is an ordinary illustrator, Yao Xiaoxiao. She transmigrated into a male novel and became the female villain, but she doesn't have a cheat or a system. She needs to rely on her own efforts to survive. This novel was a fantasy romance novel that female readers liked very much. It was very anti-transmigration and was worth reading. I hope you like this fairy's recommendation. Muah ~😗
I don't really know since I haven't read it. But usually, there would be a protagonist who wields the immortal sword. There might also be a mentor - like figure who guides the protagonist in the reverse world.
The main character is surely the immortal swordsman. There could be other important characters around him. Maybe there's a female character who serves as his love interest or a partner in his adventures. There might also be an old sage - like figure who gives him advice or guidance in this reverse world. And of course, there could be villains, like powerful warlords or dark mages who oppose the swordsman and his quest in this strange world.
The characters in an erotic reverse harem novel develop in interesting ways. The female character will likely experience personal growth. She'll be exposed to different personalities and love styles among the male characters, which will shape her own identity. The male characters will develop their own unique relationships with the female. Some may become more possessive, while others may become more laid - back. And in terms of sexual development, all the characters will likely become more comfortable with their own desires and those of others as the story unfolds, which is an important part of the overall character development in this genre.
Since I haven't read the novel, I can't say for sure. But surely the immortal swordsman is one of the main characters. There may also be other characters like his friends or foes, perhaps a mentor figure who guides him in this reverse world.
Bill Cipher is a very common main character in Reverse Falls fanfic. He usually takes on an even more menacing role in the Reverse Falls universe. Dipper and Mabel also often appear, but with their darker, Reverse Falls versions. These versions might have different personalities and motives compared to their original counterparts.
In reverse batman fanfiction, re - imagining characters involves changing their roles and relationships. Batman himself could be re - imagined as a power - hungry dictator - like figure. Commissioner Gordon might be forced to work with the villains to bring down Batman. The Riddler could become an informant for the 'good side' (formerly the villains) and use his riddles not to taunt Batman but to expose his wrongdoings. Every character's personality traits are still there but are used in a completely different context.