Since I don't know the specific 'My Girlfriend Visual Novel', I can't say for sure. But likely the main characters are the protagonist and his girlfriend.
Typically in a 'My Girlfriend Visual Novel', the main character would be the male lead who is in a relationship with the girlfriend. The girlfriend character herself is also a main character. There might also be some side characters like friends or family members who play a role in influencing the relationship between the two main characters.
A 'my girlfiend visual novel' could tell a story of love and companionship. It might start with the meeting of the two characters, the initial attraction, and then delve deeper into their relationship. There could be various settings and scenarios, such as going on dates, having arguments, and making up. The visual aspect of the novel would enhance the experience by providing images that match the mood of the story, like showing the expressions of the characters during important moments in their relationship.
Since it's based on a diary, the main character is probably the diary's author. There might also be secondary characters such as a best friend who plays an important role in the author's life, or a love interest that is often written about in the diary. However, without more information about the 'my diary visual novel', it's hard to say for certain.
Since I don't know the details of 'my master visual novel', it's hard to determine the exact main characters. However, in a visual novel with such a title, you can expect a main character who embodies the role of the master. This character may be joined by characters with different personalities and motives. For instance, there could be a wise advisor character, a strong - willed companion, or an antagonist who opposes the master's plans. These characters would interact with the master and drive the story forward through their relationships and conflicts.
I'm not sure exactly, but probably the 'lady' in the title is one of the main characters. There might also be a male lead if it has a romance aspect.
Since I don't know the specific 'my darling visual novel', I can't say for sure. But usually, there would be a protagonist who is likely to be the one with the strong feelings for the 'darling' character. There might also be friends or family members of the main characters who play important roles in the story.
The main characters are probably the protagonist and their senpai. There might also be some supporting characters like the protagonist's friends or classmates.
Since I haven't read or played this particular visual novel, it's difficult to say exactly who the main characters are. However, based on the title, one can assume that there is a character who has a devil in their arms. This could be the protagonist, and perhaps there is another character who is the devil. There may also be side characters such as those from the protagonist's normal life who get affected by this strange relationship with the devil.
Since I don't have detailed information about this specific visual novel, the main character is likely to be the princess herself. There might also be a prince or a knight as important characters.
The main character is surely the bullied bride. She is at the heart of the story. Besides her, there might be her family members who could be either supportive or part of the problem causing the bullying. Another possible main character could be a friend or acquaintance who plays a crucial role in her life during this turmoil. Maybe there's a mysterious character as well, who has some hidden connection to the bride or the situation, and as the story unfolds, their role becomes more and more important.
There could be the main character, the one for whom she is the 'light'. He might be a young man with his own set of problems and dreams. And of course, the female character who is the central figure in terms of being the source of light. Maybe there are also antagonists or characters who oppose the relationship or the growth of the main character, but this is all speculation without reading the visual novel.