The main characters could be an older man who has a stable life in the country and a younger immigrant woman. The man may have lost his previous love and is a bit jaded. The woman is eager for a new start. Initially, their marriage is just a means to an end for her. But the man's wisdom and stability start to attract her, and his appreciation for her youth and energy makes him fall in love too. And thus, they develop a relationship beyond the green card deal.
Well, perhaps it starts with a character entering into a marriage mainly for the green card. Then, as time goes by, they start to discover the real person behind their spouse. They gradually develop true feelings through shared experiences like dealing with daily life challenges, family gatherings, or even some difficult times. And finally, they find that love has grown where there was once just a practical arrangement.
There might be a protagonist who is on a quest related to the black card. And perhaps there are antagonists who also want the black card for their own purposes. Maybe there's a wise old character who knows the secrets of the black card and helps or hinders the main character depending on their intentions.
I'm not sure as I haven't read it, but it's likely there's the card apprentice himself or herself as a main character.
I'm not sure exactly who the main characters are without reading the book. But they could be ordinary people in different marriage situations, like a husband and a wife trying to make their marriage work.
I don't know the specific main characters in this novel as I haven't read it. But they could be African - American travelers or those who were involved in the creation or distribution of the Green Book.
Perhaps there's an old hermit who has some knowledge about the Green Man. He could be an important character as he might hold the key to the Green Man's origin or purpose. And there could be a villain, someone who wants to harm the Green Man or use his powers for evil.
From what we can tell by the title 'married without love haley and nathan', Haley and Nathan are the main characters. We can assume that they are the ones whose relationship in the context of a loveless marriage is being explored in the novel.
The monster itself would be one of the main characters, of course. And there could be a human who falls in love with the monster. This human might be an outcast in their own society, so they can relate to the monster's sense of not belonging. Another possibility is that there could be a wizard or a fairy who befriends the monster and helps in the journey of love, perhaps by using magic to make the monster more acceptable to others.
The main characters are, of course, Green Lantern and Green Arrow.
I don't know the specific main characters since I haven't read the novel. But they are likely to be the couple who are married for the 120 days, maybe a young couple full of dreams and ideals about marriage.