There's no way to know without more details. It might be a lone warrior with a mysterious past as the main character. Or perhaps it's a female lead with special abilities who is the central figure in the story. There could also be a sidekick character who plays an important role in the plot.
Since I don't know which 'radiant light novel' you are referring to, I can't say for sure. It could be a young protagonist on a journey of self - discovery, or a group of friends with different personalities.
Without having read the specific 'radiant light novel', it's difficult to name the main characters. However, in a general light novel scenario, it could be a young mage as the main character who is trying to master their radiant magic. There might also be an older mentor figure who guides the main character. And there could be an antagonist who is envious of the main character's radiant qualities and tries to stop them from achieving their goals.
If you want the clearest chapter reference, go to Chapter 157. Early on, It was already the last day of Flash Change in his dream.; later, the chapter leans on His good score had successfully surpassed Jiang Li, making him first in....
Chapter 106 is the strongest chapter-level answer because it starts from Thinking of this, He Yun nodded with a hint of anticipation. and follows through on Jiang Li's fingers lingered over the three copper coins, her clear voice....
If you want the clearest chapter reference, go to Chapter 129. Early on, When they saw that the live chat was full of praise for Jiang Li, those...; later, the chapter leans on Had they been used as pawns by publicity accounts?!.
A practical answer is Chapter 101, because it turns the idea into a concrete scene. The chapter opens with Jiang Li walked over to the slope where the two had fallen down., adds pressure through So how did Uncle Zhao conceive such a son?, and ends on If you encounter any trouble in the future, you.
Look to Chapter 110 for the clearest answer. It begins with Jiang Li, carrying a wooden basin, walked over to the well., keeps building through Uncle Zhao's house didn't have a water heater, so she could only make do..., and lands on My parents died, and fortunately, Daddy found and took me in..
The best chapter pointer here is Chapter 100, "Ominous, there might be a bloody disaster!". It opens with The barrage was about to die of laughter. and closes on Her eyes flickered slightly as she grabbed the hand..
The best chapter pointer here is Chapter 98, "Jiang Li is So Daring!". It opens with Jiang Li listened to the end and didn't have much of a reaction, only... and closes on That's why she's not scared.]] Everyone held their breath, clearly, the....
The best chapter pointer here is Chapter 86, "If you don't welcome me, why should I stay?". It opens with After over an hour of fuss, it was finally time to eat. and closes on But then her expression became resolute and arrogant..
Look to Chapter 114 for the clearest answer. It begins with As time passed, the number of viewers in the live broadcast gradually..., keeps building through After a whole day of trending searches yesterday, the popularity of..., and lands on But just now, an uncle came and said not to give you.
Chapter 116 is the strongest chapter-level answer because it starts from But before the audience in the live room had time to continue brewing the... and follows through on Their old Jiang family never had such twisted genes in hundreds of years!.