It could be that Percy's friends from his own time somehow also get involved in the time - travel situation, either accidentally or on purpose. So we could have Annabeth or Grover also end up in the past with Percy. Or there could be a character in the past who is a seer or a prophetess. She could foresee Percy's arrival and either help or hinder him depending on her own motives and the prophecies she has seen.
One character could be a time - keeper or a wizard who has the power to send Percy back in time. This character could be an old and wise figure, full of knowledge about the past and the ways of time travel. Another could be a historical figure that Percy meets in the past. For example, a famous warrior or a philosopher who becomes Percy's ally or mentor.
There could be a love interest for Percy in the past. It could be a local girl from the era he's sent to, who is kind - hearted and brave. She might initially be curious about Percy, seeing as he's so different from the people of her time. And then there's always the possibility of a villain in the past. Maybe a power - hungry noble or a dark sorcerer who sees Percy as a threat to his plans and tries to stop him from achieving whatever he needs to do in the past.
Chapter 594, "Raising Soldiers for a Thousand Days, Using Them for a Moment", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. Early on, Thinking of this, Jiang Yan squeezed himself next to Zhao Lang while....
Chapter 487, "Found a Kindred Spirit?", is the clearest early answer because it turns Dragon Head Ruler's situation into a concrete plot event. The chapter turns that into something concrete by moving from Shang Shaojing noticed everyone's weary expressions and, after a...
Chapter 489, "Has She Been Morally Kidnapped?", is the clearest early answer because it turns Nina's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Yeah," Nina nodded, "I thought you looked pretty imposing, must be...
Chapter 547, "What a bustling family you all are", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. Early on, Because of the unsightly scandal caused by watching the live....
Chapter 433, "The Young Master Has His Own Ideas", is the clearest early answer because it turns Team's situation into a concrete plot event. It opens with Since Jiang Yan and his group left, the house had become much colder.
Chapter 469, "He Must Not Tolerate This Calamity", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from There was no other choice, so Jiang Li and the others hastily turned...
Chapter 683, "This is where you will be filming from now on!", is the clearest early answer because it turns Sister's situation into a concrete plot event. The chapter turns that into something concrete by moving from The Capital had entered winter by November.
Chapter 434, "The Identity of the Feng Shui Master Can't Be Hidden Anymore", is the clearest early answer because the hidden truth stops feeling like mere subtext. The chapter turns that into something concrete by moving from He thought Jiang Li was just talking, but to his surprise, there...
Chapter 372, "Finish the Wine and I’ll Let You Leave", is the clearest early answer because it turns Jin's situation into a concrete plot event. Early on, Jin Si Yue suddenly realized that his wrist was back in proper....
Chapter 447, "Going Viral on the Internet", is the clearest early answer because it turns Zheng Xun's situation into a concrete plot event. It opens with Old Sir Jiang: "...." His face had grown even worse. and closes on She quickly grabbed He Wen's laptop and indeed saw that the various....