We can only guess at this point. Besides Hikari, there could be a rival character who constantly challenges Hikari. This rival might have different beliefs or goals, which creates conflict in the story. There may also be a love interest for Hikari, who plays an important role in Hikari's emotional development.
Since I don't know the specific content of Hikari Light Novel, I can't be sure. But it's likely that Hikari is one of the main characters. There might also be a mentor - like figure who guides Hikari on his or her journey.
As we don't have much information about the Hikari Light Novel, it's possible that there are a group of main characters along with Hikari. For example, there could be a group of friends who are all involved in a mystery that they need to solve together. Each character might bring their own skills and personalities to the table, and their interactions with Hikari are what drive the story forward.
If you want the clearest chapter reference, go to Chapter 93. Early on, Jiang Li looked back and saw several aunties linking arms, walking up the...; later, the chapter leans on The leader was indeed the aunt to whom she had read fortunes this morning..
The best chapter pointer here is Chapter 131, "This Lady is Here to Travel". It opens with Just around mealtime, Director Sun came over pushing his small food cart. and closes on Hungry, they no longer cared about their appearance, quickly washed their....
Chapter 97 is the strongest chapter-level answer because it starts from Suddenly, Jiang Li's livestream room was packed with people, and the... and follows through on And you believe what she says?.
If you want the clearest chapter reference, go to Chapter 87. Early on, Luckily, at that time, Jiang Li had already taken her pot of stinky...; later, the chapter leans on But all this still didn't escape the high-definition camera..
Chapter 102 is the strongest chapter-level answer because it starts from When the camera cut back, the three of them had already returned to the... and follows through on The cameraman, with a blank expression, turned off the camera, causing....
Chapter 87 is the strongest chapter-level answer because it starts from Luckily, at that time, Jiang Li had already taken her pot of stinky... and follows through on I'm driven crazy by him every day.] [+1 from above!.
The best chapter pointer here is Chapter 62, "There is Something Strange". It opens with Sitting on the edge of her bed, she pondered for a while before lifting... and closes on Jiang Li reached in, pulled out a piece of paper, and slightly raised her....
Look to Chapter 128 for the clearest answer. It begins with Still hungover, Huo Ziyang had just awakened from a blurry dream when his..., keeps building through He clicked his tongue in annoyance and picked up the phone., and lands on There had been no shortage of Weibo posts criticizing Jiang Li.
Look to Chapter 85 for the clearest answer. It begins with Facing everyone's skepticism and curiosity, Jiang Li explained fluently:..., keeps building through The tomatoes are grown by them, and the eggs are also from their..., and lands on This fresh and vibrant flavor blended perfectly..
The best chapter pointer here is Chapter 123, "Can This Even Be Calculated?!". It opens with After He Yun also carefully rolled up her trouser legs and walked down... and closes on Seeing this, He Yun chuckled softly to himself, then glanced at his own....