There could be a young and ambitious samurai as one of the main characters in the 'shogun story'. He might be on a quest to prove himself in the eyes of the shogun. And there could be an old and wise advisor to the shogun who plays a crucial role in the story, guiding the shogun's decisions and actions. Also, a mysterious stranger who enters the shogun's territory and disrupts the existing order could be another main character.
Lady Mariko is also a significant character. She is caught between two cultures, being Japanese but having to interact closely with Blackthorne. She is intelligent and plays a crucial role in many of the power plays and cultural exchanges that occur. And there's also Yabu, a daimyo who is involved in the political and military struggles in the story.
Blackthorne is adventurous and has a strong will. He's from a different culture but tries to adapt to the Japanese ways. Toranaga is highly intelligent and power - hungry. He'll do whatever it takes to maintain and expand his power.
In the 'shogun novel', main characters often include the shogun himself, who wields great power and influence. There may be a foreigner, perhaps a trader or an adventurer, who gets caught up in the complex web of Japanese politics. And of course, there will be samurai characters, some of whom are key players in the power struggles and battles that take place in the story.
Again, without more details about the 'shogun original story', it's hard to say. But likely there would be shoguns themselves as main characters, and perhaps some of their loyal samurai or advisors.
Most likely, the main characters would be the shoguns themselves. For instance, Tokugawa Ieyasu would be a key figure if the story covers the Tokugawa shogunate. There might also be important samurai who served under the shoguns, like Honda Tadakatsu.
Since I don't know the exact 'Shogun Love Story', I can't say for sure. But it's likely to have a shogun as one of the main characters. There might also be a love interest, perhaps a court lady or a commoner.
Again, without knowing the exact'shogun book story', it's difficult to say. But if it's 'Shogun' by James Clavell, the main character is John Blackthorne, a European sailor who gets caught up in the politics and culture of feudal Japan.
Since I don't know the exact story, it could be the shogun himself as the main character. There might also be his loyal samurai warriors who served him.