Create an interesting plot. Maybe start with a problem that can only be solved by the combined efforts of characters from both worlds. For example, if you're crossing with the Star Wars universe, a threat that requires demigod powers and the Force to defeat. Develop the characters' relationships as the story progresses. Show how they grow to trust and rely on each other.
First, know both universes well. For a 'Percy Jackson Crossover Fanfic', you need to be familiar with the Percy Jackson world, like the gods, demigods, and Camp Half - Blood. Also, understand the other universe you're crossing it with. This knowledge will help you create believable interactions between characters.
Keep the tone consistent with the Percy Jackson series. Percy has a certain sense of humor and a way of dealing with things. Try to maintain that in your fanfic, even when introducing new elements from the other universe. Also, don't be afraid to be creative and put your own spin on things. Add new monsters or unique settings that combine features from both worlds.
Chapter 136 is the strongest chapter-level answer because it starts from A few people retraced their steps back to the place they had just been. and follows through on Aunt Ying and the camera PD arrived soon after..
A practical answer is Chapter 158, because it turns the idea into a concrete scene. The chapter opens with Reluctantly, Jiang Yan had no choice but to forcibly join the group for..., adds pressure through Don't make me laugh, Jiang Li looks better even without makeup than she..., and ends on we're.
Chapter 140 is the strongest chapter-level answer because it starts from In the evening, the setting sun was like blood, dyeing the entire earth a... and follows through on I was just joking, just joking." Seeing that Wen Jiaojiao had no intention....
A practical answer is Chapter 182, because it turns the idea into a concrete scene. The chapter opens with At this moment, Qi Tianyu, who had just arrived in the Capital, couldn't..., adds pressure through So, when it came time to draw lots, she effortlessly drew a ball of the..., and ends on But.
Look to Chapter 167 for the clearest answer. It begins with By the experimental field, Qi Tianyu was quite helpless as he watched Wen..., keeps building through He tried once again to pull back his suitcase, but to no avail, as one end..., and lands on Even when getting into the car, Qi Tianyu was.
The best chapter pointer here is Chapter 173, "Su Yinwan, You Did It on Purpose, Right?". It opens with Jiang Li finally rose from her seat. and closes on Yet Miss Su went out of her way to ask me not to be angry..
If you want the clearest chapter reference, go to Chapter 185. Early on, He was so anxious that he immediately picked up the megaphone.; later, the chapter leans on Villagers over there, how did we train you before?.
A practical answer is Chapter 140, because it turns the idea into a concrete scene. The chapter opens with In the evening, the setting sun was like blood, dyeing the entire earth a..., adds pressure through The Master should come to our place, she helped predict my child's future..., and ends on I.
If you want the clearest chapter reference, go to Chapter 178. Early on, Wen Jiaojiao is just too unreasonable, why does she have to single out...; later, the chapter leans on She's just new here, isn't she?" "Exactly, Wanwan is obviously doing it by....
A practical answer is Chapter 168, because it turns the idea into a concrete scene. The chapter opens with Su Yinwan spoke those words with a pitiable expression, then lowered her..., adds pressure through But this time, for lunch, Jiang Li cannot help, the rest of you must..., and ends on The Gu.