We can only guess based on the title. The protagonist, who holds the tyrant's heart, is surely one of the main characters. This character might be a strong - willed individual with a complex personality. The tyrant, on the other hand, is likely to be a complex figure as well, perhaps with a troubled past that led to their tyrannical behavior. There could also be a love interest or a rival for the protagonist's attention, which would also be important characters in the story.
I'm not sure specifically as I haven't read it in detail. But generally, it might involve a story where the protagonist has some sort of connection or influence over a tyrant's heart, perhaps in a political or romantic context.
Since I don't know the specific 'love on hold novel', it's hard to say who the main characters are. However, generally in such a novel, you might expect two main characters who are in love but facing obstacles. One could be a strong - willed person who is determined to overcome the situation that is putting their love on hold, and the other might be more hesitant or dealing with internal conflicts related to the relationship.
There might also be a wise advisor. This character would be crucial in providing guidance to the tyrant, whether he takes the advice or not. The advisor could have his own motives and secrets, which add more depth to the story and the relationships between the characters.
Obviously, the woman who gives birth to the child is one of the main characters. She is likely to be the protagonist, going through a series of emotional and physical challenges. The tyrant himself is another main character. His actions and decisions would drive much of the plot, especially regarding the child and the mother.
Since I haven't read the 'hold back the stars novel', I can only make some general assumptions. There might be a male lead who is ambitious and full of hope at the start. He could be joined by a female character who is more practical and helps ground him. There could also be an antagonist, someone who creates obstacles for the main characters. Maybe a jealous rival or a strict authority figure. But again, this is all speculation without having read the actual novel.
Since I haven't read the 'hold back this day novel', I can't tell you who the main characters are.
Not having read the 'hold on to my man novel', it's hard to name the main characters precisely. But we can assume that there is a protagonist, probably a woman, whose main goal is to hold on to her man. There might be a love interest, the man she is trying to hold on to. And then there could be other characters like the man's friends or the woman's family who influence the relationship in one way or another.
Since we don't have much information about the 'hold me tight novel', it could have a young couple as the main characters. They could be going through various challenges in their relationship, and the act of 'holding tight' could be their way of dealing with those issues.
As I'm not familiar with the 'hold back the day novel', it's difficult to name the main characters. However, they could be a diverse group. There might be a protagonist who is leading the effort to hold back the day, perhaps a young and determined person. There could also be side characters who either support or oppose this main character's quest. Maybe there's an old wise figure who provides guidance, or a villain who is trying to make the day progress in a negative way that the protagonist is trying to prevent.
I don't know who the main characters in 'hold the line graphic novel' are. It could be a group of soldiers if it's a war - themed story. Or it might be ordinary people turned heroes in a time of crisis.