I'm not sure specifically as I haven't read the exact 'isekai tensei no boukensha novel'. But usually in this type of novel, there is the protagonist who has been reincarnated into the isekai world. They are often the central figure around which the story revolves.
There may be side characters as well. These could be friends or comrades that the protagonist meets during their adventures. For instance, there could be a mage who helps the protagonist understand the magic in the new world, or a warrior who trains the protagonist in combat skills. They play important roles in the story by either providing support or creating conflict.
A common theme is starting anew. The protagonist often gets a fresh start in a new world, leaving behind their old life. For example, in 'That Time I Got Reincarnated as a Slime', the main character gets to build a new identity in the isekai world. Another theme is power - acquisition. Characters usually gain new powers or abilities in the new world, like in 'Overlord' where the main character already has a lot of in - game power which he uses in the new world. Also, friendship and alliance - building are common, as seen in many of these novels where the protagonist teams up with others to face challenges.
One interesting aspect could be its world - building. It might create a unique and immersive otherworldly setting for the protagonist to explore. This can include different magic systems, strange creatures, and complex social structures.
I'm not sure exactly who the main characters are without reading the novel, but it's likely that the reincarnated noble is one of the main characters. This character would be central to the story as they navigate the new isekai world.
One popular 'isekai tensei boukensha novel' is 'That Time I Got Reincarnated as a Slime'. It has an interesting premise where the protagonist is reincarnated as a slime in another world. The story follows his adventures as he builds his own nation and makes friends and allies. Another great one is 'Overlord'. The main character finds himself trapped in a game world as his in - game character, an all - powerful overlord, and his actions and decisions shape the new world he's in.
The character development is often a big draw. Protagonists usually start from a weak or confused state in the new world and grow into powerful and confident individuals. For example, in many such novels, the hero has to learn new skills and magic to survive, which is exciting to follow. Also, the exploration of new worlds with unique landscapes, creatures, and societies adds to the allure. It's like a treasure hunt for the reader as they discover these new elements along with the protagonist.
There's also 'Sword Art Online' which, while not strictly a traditional 'isekai tensei no boukensha' in the purest sense, has elements of being transported to a different virtual world that can be considered in a similar vein. It's very well - known for its action - packed battles and interesting character relationships.
I don't know for sure as I haven't read the novel. But typically in such isekai novels, the main character is the reincarnated noble.
Since I haven't read 'Tensei Kizoku no Isekai Light Novel', I can't name the main characters specifically. But typically in an isekai light novel like this, there would be the protagonist who is the reincarnated noble. There might also be side characters like a mentor figure who helps the protagonist understand the new world, or rivals who oppose the protagonist's goals in the new world.
Since I haven't read the novel specifically, I can't say for sure. But it's likely to have the reincarnated sage as a main character. There may also be characters who help or oppose the sage in their journey.
The main character is likely the reincarnated sage. Since the title has 'tensei kenja' which means reincarnated sage, this character should be central to the story. There may also be other characters like the people the sage meets in the isekai world, such as local villagers, other adventurers, or perhaps even some magical beings.