There might be a rebel character in the 'rule of names story'. This person could be someone who doesn't believe in the traditional 'rule of names' and wants to create a new way of naming or being named. And there could also be a character who strictly adheres to the 'rule of names', perhaps a conservative figure in the community, who sees any deviation from the rule as a threat to their culture or values.
I'm not sure specifically as I don't know which 'rule of the game' short story you're referring to. It could be about a group of friends who play a game together, so the main characters would be those friends.
Without more information about the 'rule of four novel', it's difficult to determine the main characters. However, based on the title, it could be that there are four main characters. They might be related in some way, like four siblings, or they could be four strangers brought together by some event in the story. They could each have their own backstories and motives that are gradually revealed as the novel progresses.
There could be teachers as main characters too. For instance, Professor McGonagall who is known for upholding the rules. She could play a major role in the 'hogwarts da rule book story' by punishing rule - breakers or teaching students about the importance of the rules. Also, the headmaster or headmistress, whether it's Dumbledore or someone else, could be involved in making and enforcing the rules in the story.
Since I don't know the specific 'rule breaker light novel', it's hard to say. But it could be a young rebel who is tired of the old - fashioned ways of his family or society.
Since I haven't read it, I can't say for sure who the main characters are.
The 'rule of names story' could be about various things. It might be a story where names hold special significance, like in some fantasy worlds where a person's name determines their fate or powers. For example, in some tales, a character named 'Eldar' might be destined to be a great wizard because the name 'Eldar' is associated with magic in that story's lore.
Harry Potter is surely a main character. Ron Weasley would probably be in there too. They have always been a trio in the original series, and in this fanfiction, they could be involved in the rule of three concept. Additionally, Dumbledore might be an important character even if only in a guiding or posthumous influence kind of way, as he was very knowledgeable about magic and could have left some clues about the rule of three.
Sometimes, there are female characters who are underestimated at first. But as the story progresses, they show their true potential. Maybe it's a shy girl who turns out to be an amazing artist and uses her art to inspire other girls to be confident and take charge in the world.
Often, there is a powerful vampire leader. This character is usually charismatic and has great strength and influence among the vampire community. They are the ones making the major decisions regarding the rule of the world. Another common main character could be a human who somehow gets involved in the vampire world, either as a captive or as a sort of liaison between humans and vampires.
Often, there will be a powerful and wise Pokemon like Mewtwo as a main character. Mewtwo has the intelligence and strength to lead and rule over humans. It can use its psychic abilities to communicate with humans and enforce its will.