It's possible that Ron could play a major role. He might be the one who first discovers the connection between the two universes and tries to convince Harry and Hermione to explore it further. Another potential main character could be a new student at Hogwarts who has a secret past related to Fist of the North Star. This student could introduce the martial arts and the different philosophy of Fist of the North Star to the wizarding community. Also, Dumbledore could be a main character in a sense that he is aware of the existence of the Fist of the North Star world and is guiding the students to use the knowledge from there for the good of the wizarding world.
One interesting concept could be the fusion of magic from Harry Potter and the martial arts style of Fist of the North Star. For example, a wizard using the 'Hokuto Shinken' style to cast spells in a more combat - effective way. It might also involve characters from both universes interacting in unique ways, like Harry Potter learning some of Kenshiro's techniques and applying magic to enhance them.
Since it's a new novel in the 'Fist of the North Star' universe, it could have Kenshiro as a main character still, leading the fight against evil. There might also be some new characters, perhaps a young apprentice who Kenshiro trains, or a female character who has her own special skills and becomes an important part of the story. Maybe there's an antagonist who is more powerful and cunning than the previous ones, and their interactions with Kenshiro and the other characters shape the story.
Kenshiro is the main character. He's a tough fighter with a heart of gold.
The most important character is Kenshiro, who is known for his martial arts skills and his sense of justice. He is the one who drives the story forward. Other characters include the different villains he has to face. Each villain has their own motives and fighting styles, which makes for interesting battles. Then there are the ordinary people that Kenshiro tries to protect, and they also play a role in the story as they are the ones Kenshiro is fighting for.
I'm not sure who the specific main characters are in this sub - story. It could potentially include some of the well - known characters from the main 'Fist of North Star' series like Kenshiro, but also perhaps some new characters that are specifically related to the liar - centric plot.
In the 'Fist of the North Star Raoh Side Story', Raoh takes center stage. However, we can expect to see other characters as well. His family members, if any are mentioned in this side story, could play a role. There might also be characters who represent different factions in the post - apocalyptic world. These could be either his allies in some situations or his enemies when their goals clash. And then there are the common people in the world that Raoh's actions would affect, and some of them could have more prominent roles in the story as well.
The main character is Kenshiro. He is a master of the Hokuto Shinken martial art.
In addition to the regular Harry Potter crew, there could be a character who is a native of the 'Lord of the North' and acts as a guide for Harry and the others. This character could have unique magical abilities related to the northern environment, like being able to control ice or snow magic, and would play a crucial role in their adventures.
Kenshiro is without a doubt one of the most important characters. He is the protagonist with his super - powerful martial art of Hokuto Shinken. Raoh is also very important. He is a powerful antagonist, often challenging Kenshiro. And then there's Yuria, who has a special connection to Kenshiro and is a key figure in the story.
There could be a magical creature that has been corrupted by dark magic in the North. This creature sees Harry Potter as a threat to its existence and will do everything it can to drive him out or even kill him. It might be very powerful and difficult to defeat, forcing Harry to find new ways to use his magic.