Since I haven't read the novel, I can't say for sure who the main characters are. However, it's likely that there is a protagonist who is on a journey related to their dantian. There may also be a mentor figure who helps the main character understand and develop their dantian powers.
I'm not familiar with the specific 'endless dantian light novel', but in such novels, there is often a young and determined main character. Maybe there's a male lead who is born with an unusual dantian and has to face the envy and challenges from others. There could also be a female character who is either a love interest or a powerful ally, perhaps with her own unique abilities related to the dantian concept.
Without having read the 'endless dantian light novel', it's hard to name the exact main characters. But in many novels of this kind, we can expect a central figure who is on a quest to unlock the secrets of their dantian. There might be side characters like friends who join the main character on their adventures, or antagonists who try to prevent the main character from achieving their full potential with their dantian.
Look to Chapter 101 for the clearest answer. It begins with Jiang Li walked over to the slope where the two had fallen down., keeps building through Below the small hill was nothing other than a large patch of sludge., and lands on If you encounter any trouble in the future, you can come to me..
The best chapter pointer here is Chapter 120, "Jiang Li Can Actually Do Acupuncture?!". It opens with Facing the sudden and somewhat strange request from Jiang Li, Director Sun... and closes on Drink this." Wen Jiaojiao looked at the half cup of thick substance:....
The best chapter pointer here is Chapter 95, "The Problem Lies with Your Boyfriend". It opens with Hearing others praise her daughter, Aunt Lin was smiling so wide she... and closes on Your boyfriend must have studied in another province, if I'm not mistaken,....
The best chapter pointer here is Chapter 124, "Officially Certified 250". It opens with Since there were too many points cards inside Jiang Li's barrel, Director... and closes on No need to repeat that number three times.] [Hang on, didn't Jiang Yan....
Look to Chapter 149 for the clearest answer. It begins with Seeing that Zhang Cheng's glass was nearly empty, Du Qinglian immediately..., keeps building through Director Zhang, this Zuichun Mountain is a specialty of Bi Garden, brewed..., and lands on Zhang, I introduced myself at the very.
Chapter 120 is the strongest chapter-level answer because it starts from Facing the sudden and somewhat strange request from Jiang Li, Director Sun... and follows through on Drink this." Wen Jiaojiao looked at the half cup of thick substance:....
Chapter 114 is the strongest chapter-level answer because it starts from As time passed, the number of viewers in the live broadcast gradually... and follows through on But just now, an uncle came and said not to give you anything to eat." Qi....
Chapter 74 is the strongest chapter-level answer because it starts from Having seen Jiang Li's ID before, he knew that this person named Shiguang... and follows through on The man's phoenix eyes narrowed slightly, he looked at the girl sitting....
Chapter 96 is the strongest chapter-level answer because it starts from Jiang Li's words seemed absurd, yet there also seemed to be a trace of... and follows through on Xu Ling couldn't contain her soft sobbing, "How could this happen?.
If you want the clearest chapter reference, go to Chapter 88. Early on, She wanted to refuse, but didn't have the courage to do so.; later, the chapter leans on The Chen'an Entertainment she worked for was currently the largest....