There could be a best friend character as well. In many love novels, the best friend plays an important role. They might offer advice to the main character in 'the trouble with love novel' or create some sort of complication in the relationship. There could also be a rival in love, someone who competes with the main character for the affection of the love interest.
I'm not sure specifically as the name doesn't give away the characters directly. But typically in a love novel, there would be the two lovers at the center. Maybe a male and a female character who are from different backgrounds or have different personalities.
As I haven't had the chance to read 'Trouble Boy Love Story', it's difficult to say who the main characters are. But it's likely to have the trouble boy as one of the main characters, and perhaps the person he falls in love with, like a girl who might be his opposite in some ways, for example, very calm and stable while he is all in chaos.
Often, there will be a central girl character who is facing the trouble. She could be a teenager, like a high - school girl dealing with bullying or family issues. There might also be her best friend who plays a supporting role, either helping her out or getting into trouble alongside her.
I have no idea as I haven't read the novel. It could be a patient with heart trouble as the main character.
Since I haven't read the 'Trouble in Paradise' novel specifically, I can't say for sure who the main characters are.
There could be a diverse range of characters. It might have a young, naive character who gets dragged into the big trouble and has to grow up quickly. There could also be an older, wiser character who acts as a mentor or guide to the main character. And of course, there could be side characters like friends or family members of the main character who are also affected by the big trouble.
Most likely Ben would be one of the main characters. Since it's a Ben 10 fanfiction, he's usually at the center of things. And if it's about love, perhaps his love interest, whoever that may be in this story, would also be a main character. Maybe Gwen could also play an important role, either as a friend giving advice or getting involved in some way in the love - related drama.
I'm not sure specifically as the title doesn't give clear indication of the characters. It could be original characters created by the fanfic author. Maybe it's a story about a young couple who are the main focus of the 'trouble with love' part.
Gray could also be a part of it. He might be the one teasing Natsu about his love problems or even getting involved in some sort of love triangle situation with Natsu. And Erza, she could be the voice of reason, trying to get Natsu to sort out his feelings in a more proper way, while also dealing with her own reactions to Natsu's love - crazed antics.
I don't have enough information to say exactly who the main characters are. They could be astronauts, space pirates, or scientists, depending on the story of the visual novel.
I don't know as I'm not familiar with this novel. But typically, main characters in a novel about the troubles of being born might include the newborn or those closely related to the newborn, like the parents or siblings.