Well, from the title 'great mage returns after 4000 years light novel', it could be a story centered around a mage. After being away for 4000 years, he returns to a world that has likely changed a great deal. Maybe he has to relearn things, face new enemies or reconnect with old allies. It might also explore themes like the passage of time, power, and the mage's place in this new world.
The great mage is surely one of the main characters. But we may also find characters like the mage's former apprentices or friends who are still alive or their descendants.
Since the title mentions the great mage, he is most likely a main character. There could also be other characters such as the ones who are in power in the current world where the mage returns. Maybe there are young apprentices or other mages who either look up to him or are jealous of his power. And of course, there could be villains who oppose the mage for various reasons, like fearing his power or having old grudges against him.
There's also a chance that the antagonist is a group. For example, a council of new mages who fear the power of the returning great mage. They might see him as a threat to their new - found order and will do everything they can to stop him, thinking that his return will bring chaos to the world they have built in his absence.
Typically, in these kinds of light novels, the mage's return often disrupts the existing power balance. There might be a young and inexperienced protagonist who has to quickly adapt to the new situation. The returning mage could bring back forgotten knowledge or magic that was lost. For example, they might introduce new spells or ways of combat that the current generation has never seen. There could also be a mystery surrounding their return, like a hidden purpose or a prophecy that led to their comeback.
It could be about a mage who was once great but had to leave for some reason, like being exiled or going on a long quest. His return might stir up a lot of things in the story's world. It might involve magic battles, reuniting with old friends or allies, and facing new challenges that have arisen in his absence. For example, the power balance in the magic world could have shifted, and his return is the key to restoring order or causing chaos, depending on his motives.
Well, it might have a complex plot. Since it's been 4000 (whatever the unit is), the world would have changed a great deal. The mage might struggle to adapt to the new world while also using his old - world magic in unique ways.
Well, aside from the great mage who returns, there could be a sidekick or a mentor figure who was important to him in the past. Maybe there's a young apprentice who looks up to him and becomes involved in his return journey. There could also be an antagonist, perhaps a powerful dark mage or a political figure who sees the returning mage as a threat to their power or plans.
The plot of this novel could center around the great mage's return after 4000 years. When he comes back, he might find that the place he once knew is almost unrecognizable. His return could be a catalyst for many events. He may have to use his ancient magic to deal with modern - day problems. There could be a mystery about why he disappeared in the first place and what led to his return. He may also have to face the consequences of the passage of time, like the decay of old magic sites or the rise of new dark forces that he has to combat with his age - old wisdom and power.