One interesting element could be a mystery. Suppose the belly button pop is a signal for something that the character has to figure out. It could be related to a lost treasure or a family secret. Additionally, a touch of humor can be added. For instance, the thing that pops out could be a really clumsy little gnome who always gets into funny situations. And of course, a bit of danger. Maybe there are some villains who are after the power that lies within the belly button.
Magic is a great element. For example, like in the story I told before, having a fairy pop out of the belly button. Another could be time - travel. Maybe the belly button popping leads to a different era. Also, a talking animal emerging from it would be interesting.
If you want the clearest chapter reference, go to Chapter 46. Early on, Upon hearing this, everyone but Jiang Li perked up with high alert.; later, the chapter leans on After all, there were only a few who didn't care how others saw them..
Chapter 50 is the strongest chapter-level answer because it starts from [666, if good scores determine rankings, is Flash Change's production team... and follows through on What kind of heavenly being had such a sour temper and liked dancing....
The best chapter pointer here is Chapter 36, "The Coldest Variety Show Opening in History". It opens with But soon, people began to question the authenticity of Jiang Li's bare... and closes on After swallowing the food in his mouth, he hurriedly took his megaphone....
If you want the clearest chapter reference, go to Chapter 18. Early on, In the corner, a girl in a black dress sat quietly, holding a glass of...; later, the chapter leans on Her serene yet cold temperament, along with her exquisitely beautiful....
Look to Chapter 20 for the clearest answer. It begins with Several people turned their heads upon hearing the sound and saw three..., keeps building through She was clad in a long black dress, and the dull color did not hide her..., and lands on So, he turned and questioned Jiang Li..
A practical answer is Chapter 31, because it turns the idea into a concrete scene. The chapter opens with Before Shen Lan had reached the backyard, she already heard the sounds of..., adds pressure through And judging from the photo, she was also a stunning natural beauty!, and ends on After.
The best chapter pointer here is Chapter 18, "Criminal Law stipulates that kidnappers will be imprisoned.". It opens with In the corner, a girl in a black dress sat quietly, holding a glass of... and closes on Hurry home, what is a young lady like you doing running to a place like....
The best chapter pointer here is Chapter 63, "Far Exceeded Expectations!". It opens with During those seven days, he thought he had completely escaped from that... and closes on It was already past midnight, but the conference room at Xingmei....
The best chapter pointer here is Chapter 59, "Kicked Out". It opens with After walking for about two or three hundred meters, the old man stopped... and closes on My phone, my cigarettes, my champagne, oh how I miss you......" He swore,....