Without having read the 'love me once more novel', it's hard to say exactly. However, it's common for such novels to have a protagonist who is on a journey of self - discovery while also dealing with love. There may also be a secondary character, perhaps a friend or a family member, who plays an important role in the main character's life and love story.
I'm sorry, I haven't read the 'love me once more billionaire novel', so I don't know the main characters.
Since we don't have more information about the 'love happen only once novel', it's difficult to say exactly who the main characters are. However, it might be a young person who is naive about love at first, and then as the story progresses, they meet someone who changes their view on love. There could also be a mentor - like figure in the story who gives advice on this idea of love happening only once. Or perhaps it's about two star - crossed lovers who believe that their love is so special that it can only happen once in their lifetimes.
I'm not sure as the name doesn't give any direct hints about the characters. Maybe it could be a couple, like a young man and a young woman who are on a journey to discover if they are each other's one true love.
The main characters in a 'fool me once story' really depend on the nature of the story. It might be a young person starting out in the world, full of hope and trust, like a fresh graduate entering the job market. They could be fooled by a more experienced and unethical colleague. Or it could be a lonely old person being deceived by a seemingly friendly neighbor. There are so many possibilities depending on the context of the story.
Since it's an Inuyasha fanfic, we can expect Inuyasha, Kagome, and the black dog to be central. Inuyasha, the half - demon with his sword Tessaiga, is always at the heart of any Inuyasha - related story. Kagome, the modern - day girl who travels back in time, has a crucial role. The black dog, which the title refers to, is likely to be a character with its own motives and backstory. And depending on the direction of the fanfic, other characters like Shippo, the young fox demon, could also be important.
I don't know for sure. But it could be the hero himself, perhaps his friends or comrades from his heroic days, and maybe the antagonists who oppose him.
In 'Once a Runner, a Novel', the central character is a runner with a passion for the sport. He may have a group of fellow runners, some of whom are his friends and some his competitors. There could also be a coach or a family member who plays an important role in his running life. Their interactions and relationships form the backbone of the story, with the runner's journey towards achieving his running aspirations at the core.
Since I don't know the exact novel, I can't say for sure. But usually, there would be a central character around whom the 'hate or love' dynamic revolves.
I'm not sure as I haven't read the specific 'love me or reject me novel'. But usually, there would be a protagonist who is likely to be the one in the situation of waiting for love or rejection. There might also be a love interest character.
I don't know for sure since I'm not familiar with this particular novel. But it could be a young protagonist, perhaps a girl or a boy, who is at the center of the love - hate dynamic.