Well, 'class ga isekai shoukan sareta light novel' could potentially be about a group of students in a class who are suddenly summoned to an isekai world. Maybe they have to face various challenges, like fighting monsters or dealing with political intrigue in this new world. However, this is just speculation based on the title.
Since I don't know the specific details of this light novel, I can't say for sure who the main characters are. But it could be some students from the class that was summoned.
I'm not sure specifically as I haven't read this novel directly. But generally, a title like this might be about a summoned sage who travels to another world. It could involve the sage's adventures, the challenges they face in the isekai world, and perhaps how they use their wisdom or powers.
The title indicates that the summoned sage is a key character. There may also be other characters like those who summoned him, or characters he meets in the isekai world such as local inhabitants, other adventurers, or even potential foes.
The title 'Shoukan sareta kenja wa isekai wo iku novel' gives the impression that it's a story centered around a summoned sage. In many isekai novels, the summoned character often has to deal with new and strange environments, different cultures, and various challenges. This sage might be no different. He could be using his wisdom (since he is a sage) to survive and thrive in the isekai world, perhaps making allies, facing off against enemies, and uncovering the secrets of this new realm.
I'm not entirely sure as I haven't read it in detail. But generally, it might be about some sort of summoning in the context of a Japanese - themed story. Maybe it involves characters being summoned to a particular place in a fictional Japanese world.
Some similar isekai novels could be 'That Time I Got Reincarnated as a Slime'. It also involves a character going to another world and has elements of adventure and building a new life in the isekai. Another one could be 'Overlord', where the main character is transferred to an isekai world with his in - game powers. And 'Sword Art Online' has some isekai - like elements as well, especially in the Alicization arc where the characters are in a virtual world that is very much like an isekai.
I'm not sure exactly what this web novel is about as I haven't read it. It could potentially be about a dark or gloomy soldier who has some sort of past that is being explored in the story.
Not having read the nihonkoku shoukan web novel makes it hard to say for sure who the main characters are. But if it follows common tropes in this kind of story, there could be a protagonist who is an ordinary person thrust into an extraordinary situation due to the summoning. There might also be antagonists who oppose the summoned entity or try to use the summoning for their own evil purposes. And there could be supporting characters like friends or family members of the protagonist who are affected by the events of the summoning.
In 'isekai maou to shoukan web novel', the main character is likely to be the maou who gets summoned. This character would have unique abilities and a personality that drives the story. There could also be side characters who either oppose or support the maou. For example, there might be a princess who initially fears the maou but later comes to understand and perhaps even help him. Or there could be other demon lords or powerful beings in the story's world that interact with the main maou character.