There's no way to be certain without reading it, but perhaps there's a female lead who is somehow connected to the ring. Maybe she has a special ability that is awakened by the ring, and there could be a male character who helps her on her journey with the ring. There could also be an antagonist who wants to steal the ring for their own malicious purposes.
In light novels, the main characters are often diverse. In the case of 'the broken ring light novel', there could be a group of characters. One might be a skilled craftsman or mage who tries to repair the ring. Another could be a noble with a hidden past related to the ring. And perhaps there's a wandering adventurer who stumbles upon the mystery of the broken ring and gets drawn into the whole affair, each with their own motives and backstories that unfold as the story progresses.
I'm not sure specifically as there are many novels that could be called 'the ring novel'. But generally, there could be a protagonist who discovers the ring and gets caught up in its mystery. There might also be an antagonist who wants to use the ring's power for their own evil purposes.
Since it's related to the 'Sao' series, we can expect a protagonist who is brave and determined. There could be a female lead as well, who might be skilled in different aspects of the game, like combat or strategy. There may also be a group of friends or allies that the main character teams up with to face the challenges in the 'Unital Ring' world. They would each have their own personalities and skills that contribute to the overall story.
Well, without more context, it's difficult to say precisely. It could be a light novel where 'ring ring' is the name of a character, or it could refer to the sound of a bell (ring) that has some sort of importance in the plot. Maybe it's a mystery - light novel where a ring is a key clue.
I'm not entirely sure about all the main characters, but there are male characters whose relationship is central to the story.
Sadako Yamamura is a main character. She is the source of the curse, a figure full of mystery and horror.
As I'm not familiar with the 'the broken ring novel', I can only speculate. There could be a protagonist who is on a quest related to the broken ring. This could be a young person full of curiosity, trying to figure out the story behind the broken ring. There might be an antagonist as well, perhaps someone who wants to keep the secrets of the broken ring hidden. And there could be a supporting character, like an old jeweler who provides some valuable information about the ring's origin and possible ways to fix it.
I'm not entirely sure, but there might be a character who discovers the ring. Maybe a curious explorer or an unlucky person who stumbles upon it.
Since I don't know the exact 'the magic ring novel', I can't say for sure. But usually, there would be a protagonist who discovers the ring.
As of now, there is no official 'Elden Ring' novel, so it's hard to say who the main characters would be. But if it followed the game, Tarnished could be a main character as they are central to the game's story.