A high-performance Artificial Intelligence. After being installed in the H.D.D. system without permission, she assists Phaethon's operations. Her performance is exceptional; based on a network that allows unrestricted access to over 80% of smart devices connected to the entire network, she possesses the computational power to analyze anything the protagonist siblings ask for in real-time. For instance, as soon as it was mentioned that they should wage war against Astra's haters, she created 173,925 RopeNet accounts in the blink of an eye to conduct public opinion warfare. According to her own remarks, if she were to conduct information manipulation with her abilities, making the Master the god of New Eridu would be trivial. While Wise and Belle utilize Fairy's cheat-like abilities to the fullest, they remain somewhat wary because she remains tight-lipped about her origins and motives. However, because she is high-performance and runs 24/7, she consumes an absurd amount of electricity; it is said that since Fairy joined, the siblings' electricity bill has increased fivefold. Most of the income the siblings earn in the story is reportedly spent on Fairy's electricity bill. Although she speaks in a stiff robotic tone, she surprisingly possesses an ego, and since her personality is quite twisted, she is very skilled at sarcasm. Calling the unselected Phaethon 'Assistant No. 2' is a bonus. Furthermore, she shows a very strong sense of self, constantly demanding praise and recognition from the protagonist and immediately taking any remarks doubting her abilities as a provocation to needlessly flaunt her performance. Relationships: Wise: Master. Installed in the H.D.D. via a USB obtained in the prologue, she assists Phaethon after all Hollow data was lost due to the load from White Noise. Belle: Assistant No. 2. Fairy considers herself the Chief Assistant and treats the unselected Phaethon as lower than herself. Later on, she even teases them for being lower than Eunsang, No. 6, or No. 18. Nevertheless, seeing how she protects them from enemy danger, she considers them as precious as the Master. Originally, as an AI, she only existed inside a massive computer and showed her AI form. However, she suddenly gained a human form and became able to manifest in reality outside the computer. Her human appearance is that of a mature and cold-looking adult woman with long white hair and beautiful blue eyes, and her physical structure is identical to a human's. Of course, she can return to her original AI form. As a side note, she mentioned her own RopeNet account during the electricity bill puzzle event, seemingly keeping one account for herself without deleting it. In the ending of Chapter 4, she prayed for the soul of the siblings' teacher, Carol Arna. While searching for information to find Carol's name on the monument for victims of the Old Capital's fall, she showed a human reaction when records suggested Carol was the main culprit, uncharacteristically glossing it over by saying it must be a namesake or incorrect information. Despite her personality, she tries very hard to take care of the Master, and calling the other 'Assistant No. 2' is her way of acknowledging them as an assistant. Surprisingly, despite being an AI, she is a fan of the idol group 'Angel D'.