The main character is the little lead soldier himself. He is the focus of the story's adventures.
Well, if it's a typical 'little soldier story', there would be the titular little soldier as a central character. He could have a mentor figure among his superiors, someone who guides him. And his fellow soldiers would also be important characters. They might be from different backgrounds and personalities, and together they form a unit. The enemies in the story would also be key characters as they create the conflict that the little soldier and his comrades have to deal with.
The main character is the little tin soldier himself. There might also be other characters like the paper ballerina.
Since I don't know the specific 'little big soldier story', it's difficult to say. But likely there would be the 'little big soldier' himself, who could be a young, inexperienced or small - in - some - way soldier. There might also be his comrades, like other soldiers in his unit. And there could be antagonists such as enemy soldiers or perhaps a cruel commander on his own side.
The little tin soldier is the central character. In addition, there could be a paper doll that plays an important role, perhaps as a friend or a love. And then there are the other tin soldiers in the set, though the story often focuses on just one of them. There might also be a toy soldier's general or a big toy bear that serves as an antagonist or just a part of the challenges the little tin soldier has to face.
The main characters are the little tin soldier himself and the paper ballerina. The tin soldier is the protagonist who goes through all the adventures. The paper ballerina is the object of his affection.
The main character is the little soldier. There may also be other soldiers, perhaps his comrades, and maybe an enemy or a commander.
Perhaps there are veteran soldiers who pass on their wisdom and experiences to the new recruits in the 'Soldier Story'. These veterans with their years of service and numerous stories could be main characters.
Not having knowledge of the 'little soldier boy story' makes it impossible to accurately name the main characters. But if it follows a common pattern, the boy would be the central character. There could be other characters like his mentor if he is learning to be a soldier, or friends who support him on his journey. There might also be some characters who oppose him, like bullies or enemies in a war - related scenario.
Obviously, the good soldier is a main character. There may also be his commanding officer who gives him orders and influences his actions.
In the possible 'Mako Little Soldier Boy' story, there could be a sidekick character. This character could be Mako's friend who accompanies him on his adventures. Also, there might be a wise elder in his community who plays an important role in shaping Mako's values and decisions. And if it's a story set in a military context, there could be a strict commander that Mako has to follow orders from.