The Goblin's Tail was a very popular fantasy novel and had many fanfiction creations. Here are some completed Fairy Tail Doujin novels: [1. The Magical Throne: This novel tells the story of how a puppet with magic power fights with its companions and finds its true mission after becoming a human.] 2. Blade of the Demon's Tail: This novel tells the adventures of the protagonist Naz and the other characters from his perspective. 3 Fairy Tail: Demon Eye: This novel tells the story of a team of Demon Hunters who fight fiercely against the dark forces to protect the world. 4. Blade of the Enchanted Daemon King: This novel tells the story of an adventure between Naz and the other figures. They join forces to fight against a powerful demon. 5 " The City of the Demon's Tail ": This novel tells the story of a battle between humans and fairies. The adventure story between the protagonist Naz and the other characters also begins. The above are some completed Fairy Tail Doujin novels that you can choose to read according to your preferences.