I don't know specifically since I haven't played or studied this visual novel in depth. But usually in a story about oath - breaking, there could be the character who breaks the oath, someone who is affected by the broken oath, and perhaps a mentor - like figure who tries to guide the oath - breaker.
I don't know the exact main characters as I haven't read the 'oathbreaker novel'. But it's likely to have characters directly involved in the act of oath - breaking, like the oathbreaker themselves, and those who are affected by it, such as their friends, family or enemies.
I'm not entirely sure as I haven't fully explored it myself, but generally a visual novel is a form of interactive story. 'Oathbreaker' might be about a story where someone breaks an oath, perhaps in a fictional world filled with different characters and relationships.
Since we don't know the details of '86 visual novel', we can't say for sure who the main characters are. They could be ordinary people living in a fictional world, or they could be heroes with special abilities. It all depends on the nature of the story which we don't know yet.
The 'oathbreaker novel' may explore different aspects. It could be a story set in a fantasy realm where oaths are magically binding. The main character, an oathbreaker, might be shunned by society or hunted down. Or perhaps it's a story about a person who breaks an oath for a greater good, but still has to face the internal and external consequences. It could also look at how different cultures within the novel's world view oath - breaking, whether it's an unforgivable sin or a necessary evil in certain situations.
I'm sorry, I don't have information on the specific main characters in 'by moonlight visual novel' as I haven't read it. But usually, in a visual novel, there could be a protagonist, who is likely the character through which the story is mainly told. There might also be a love interest, a friend or a rival.
The main character is likely Tomoyo. However, depending on the nature of the story, there could be other important characters. If it's a school - based visual novel, there could be classmates, teachers, or rivals. Maybe there's a best friend character who is always by Tomoyo's side, sharing joys and sorrows, and helping her through difficult times. Or perhaps there's a mysterious character who has some connection to Tomoyo and whose actions drive the plot forward.
Tomoya Aki is one of the main characters. He's the one who has the idea of creating a great game.
The main character is Omori. There are also his friends like Aubrey, Kel, and Hero. Each of them has their own personalities and roles in the story.
I'm sorry, but I don't have information about the main characters in 'Yamikumo Visual Novel'.
I don't have enough information to determine the main characters in'mikeinel visual novel'. It could be a male protagonist with a group of friends, or a female lead with some sort of special ability.