Since I haven't read it, I can't say for sure. But I assume the grand princess herself is a main character. There might also be her parents, who are likely the king and queen.
I'm not familiar with the 'Grand Princess Novel' so it's hard to be exact. However, the grand princess is bound to be a central figure. There may be antagonists as well, like a power - hungry noble who wants to usurp the throne or undermine the princess. There could also be friends or confidantes of the princess, like a lady - in - waiting who has been with her since childhood and shares all her secrets.
Since I'm not familiar with the 'Grand Hotel Novel', the main characters might be a famous actress staying at the hotel for a break from her hectic career, a bellboy who has big dreams but is stuck in a low - paying job, and the hotel manager who has to keep everything in order while dealing with various personalities. They would all play important roles in showing different aspects of life in the grand hotel.
I don't know for sure as I haven't experienced this visual novel. But usually, there would be a protagonist, perhaps a young man or woman who is either a member of the upper class or someone new to the ball scene. There might also be a love interest, and some antagonists like jealous rivals or those with ulterior motives.
There's no way to know for sure who the main characters in the 'grand k visual novel' are without more details. However, it's common for visual novels to have a protagonist who drives the story forward. There might also be a supporting cast of friends, family members, or antagonists that interact with the main character in relation to the 'grand k' concept.
Well, obviously, the princess herself is a main character. She is usually the central figure around which the story revolves.
There might be a wise old mentor figure who guides the protagonist in the search for the heavenly swords. And perhaps a female character with special powers that are related to the swords in some way. Maybe she is a seer or has some sort of connection to the otherworldly forces that govern the swords.
The two main characters are obviously the villainess and the grand duke. The villainess is likely a character with a complex personality, not just a one - dimensional 'bad guy'. The grand duke is probably a powerful and influential figure in the story's setting.
The main character is Monsieur Gustave H., the concierge of the Grand Budapest Hotel. He is a very charming and sophisticated character. Then there's Zero Moustafa, his loyal lobby boy. These two characters play crucial roles in the story, with their relationship being at the heart of many of the adventures and events that take place in the hotel.
I don't have enough information to determine the main characters. It could be politicians within the grand old party, party strategists, or perhaps people who are affected by the party's actions in the context of the story.
The main character is Wei Wuxian. He is the grand master of demonic cultivation. Lan Wangji is also a very important character. He has a complex relationship with Wei Wuxian.
In the Fate Grand Order Visual Novel, the Master is of course a central character. Then there are various Servants. For instance, Mash Kyrielight, who is a Demi - Servant and an important ally to the Master. Servants like Archer EMIYA also have significant parts. He is a skilled fighter with a complex past. There are also characters like Romani Archaman, who provides support and information within Chaldea. All these characters interact and their relationships shape the story.