The main character is surely the sage king. However, there could be a whole cast of supporting characters. There could be the king's council members, each with their own personalities and motives. There might be a young apprentice or a prodigy who the sage king takes under his wing. And don't forget about the common folk, some of whom could become key players in the story, like a peasant who discovers a secret that could change the fate of the kingdom.
I don't know the exact main characters in the 'Sage King Light Novel' as I haven't read it. But it's likely that the Sage King himself is a main character. There could also be sidekicks or companions who help him on his journey.
Obviously, the main characters are the needy king and the sage. The king is likely in a position of power but lacking in some crucial aspect which makes him 'needy'. The sage is the one who is expected to possess the knowledge or ability to help the king out.
In most 'omnipotent sage light novel' scenarios, the main character is obviously the omnipotent sage. There might also be a young and inexperienced character who is mentored by the sage. Additionally, there could be an antagonist, like a dark wizard or a power - hungry noble who stands in the way of the sage's plans or the peace of the world in the story. And there may be some other characters that are part of the sage's community, such as fellow sages or local villagers who are affected by the sage's actions.
Since it's about a great sage, the great sage himself is probably a main character.
Since it's about the 'legacy of the dark sage novel', there could be a young apprentice who was once under the dark sage. This character might be conflicted about whether to follow the dark sage's path or break away from it. There could also be a wise old wizard who has knowledge about the dark sage and tries to guide others in dealing with his legacy. Another possible main character could be a brave knight who is tasked with destroying any evil remnants of the dark sage's works.
The main character is of course the sage. He is the one with extraordinary powers and wisdom.
In addition, there could be a mentor figure for the Small Sage. This could be an old hermit who has vast knowledge and teaches the Small Sage important skills or gives valuable advice that helps the Small Sage progress in his journey, whether it's a journey of self - discovery or a battle against the forces of darkness.
Since I don't know the exact 'level 1 strongest sage novel', I can't name the main characters. But it's likely that the strongest sage would be one of the main characters. There might also be other characters like his apprentices, rivals, or friends who play important roles in the story.
Since it's a 'humanity's great sage novel', there's likely a great sage as a main character. Maybe there are also characters who oppose the sage's ideas, creating conflict in the story. And perhaps there are characters from different social strata that the sage interacts with to spread his or her wisdom.
The main character is Tanya Degurechaff. She is the central figure around which the story revolves.