The main character is bound to be the Doctor. His role would be to investigate the mystery of the 'ghost in the machine'. Alongside him, his companions, if present, would play important parts. There might also be antagonists, which could be the source of the 'ghost' in the machine, whether it's an alien entity using the machine for its own ends or a malfunctioning AI that has turned hostile. These characters would all interact with the Doctor as he tries to figure out what's going on and put an end to the strange happenings.
The Doctor is most likely one of the main characters. There could also be his companions, though without more specific knowledge about this short story, it's hard to say exactly who else.
Chapter 686, "Why Not Make Him Mute?", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event.
Chapter 403, "Neither Jiang Lijiang nor Jiang Yan Came?", is the clearest early answer because it turns Dragon Ridge Island's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Now our helicopter has arrived above the harbor in Yan City, and...
Chapter 385, "We Are Just Friends", is the clearest early answer because it turns Days's situation into a concrete plot event. It opens with Miss Su was somewhat surprised to learn that Jiang Li was going to... and closes on After finishing the tea, Miss Su began to wander around Shang....
Chapter 747, "How did Jiang Dapusa come to this?", is the clearest early answer because it turns Yet's situation into a concrete plot event.
Chapter 298, "Turning the World Upside Down", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event.
Chapter 599, "The Weather has Cooled Down, the Merchant Should Go Bankrupt", is the clearest early answer because it turns Shang Shaobai's situation into a concrete plot event.
Chapter 306, "I Believe Whatever Miss Jiang Says!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter gives readers a real answer by opening on But Jiang Li seriously shook her head, "No, Aunt Zhou, this matter...
Chapter 363, "A Cure-All for Fancy Trappings and Arrogant Tyranny", is the clearest early answer because the rescue effort creates visible on-page results. It opens with I bid 550,000!" "600,000!" "750,000!" "....." Soon, the price of the...
Chapter 483, "Why Does a Pig Eat M9?!", is the clearest early answer because it turns Pig Eat's situation into a concrete plot event. The chapter gives readers a real answer by opening on Wilderness Survival Day 11, temperature 31 degrees, wind speed...
Chapter 576, "The Electronic Pickles are Gone!", is the clearest early answer because it turns Sister Manman's situation into a concrete plot event. It opens with Tonight, Team Q exceptionally didn't cook. and closes on Before Team Q arrived, they at least had fish to eat, but now even....