I don't know since I haven't read the 'light it up novel'. It could be a young protagonist on a quest for something important.
Maybe it has a group of friends as the main characters. They might be facing some challenges together and their interactions and growth form the core of the story. For instance, they could be students trying to make a difference in their school or a group of artists trying to get their work recognized in a competitive environment.
I'm not sure specifically as I haven't read it. But often in novels, there are protagonists who drive the story forward, and antagonists who create conflict.
There may also be antagonists in the 'Level Up with Skill' light novel. These could be characters who oppose the main character's growth or who have their own goals that conflict with the protagonist's. They might also have strong skills, which makes them formidable opponents for the main character and their friends.
The main character in 'Leveling Up with the Gods' light novel is probably a unique individual with a special destiny or ability that sets them on the path of leveling up. There might be a group of comrades who join the main character on their adventures. Some of these could be from different races or backgrounds. And then there are the gods. There could be a particular god who takes an interest in the main character's progress, either to help or to hinder. There could also be a villainous god or a group of powerful entities that oppose the main character's rise to god - like status.
There is Wakana Gojo, who is a very talented but introverted high - school student with a passion for hina dolls. And then there is Marin Kitagawa, an outgoing and popular girl who loves cosplay.
In the 'Infinite Level Up in Murim' light novel, the main character is often the one with the unique leveling ability. He is likely to be surrounded by a diverse group of characters. There might be friends from different sects who join him on his adventures. Some of them could be experts in certain martial arts styles that complement the protagonist's skills. There may also be female characters who have their own importance in the story, perhaps with special abilities or knowledge that help the protagonist in his journey through the murim world.
The main character is Bell Cranel. He's a young adventurer who is on a journey in the dungeon. There are also many female characters like Hestia, who is Bell's goddess. Ais Wallenstein is another important female character, a powerful swordswoman.
The man is obviously one of the main characters in 'the man picked up by the gods light novel'. As for the gods, there could be different types of gods involved. Maybe there's a benevolent god who initiates the picking up of the man. There could also be other characters in the human world who are related to the man, like his family or friends, who might be affected by his sudden disappearance or change in circumstances, and they could also play important roles in the story.
Based on the title, the main character is clearly the man who is picked up by the gods. But without reading it, it's hard to say if there are other important characters. There could be other humans he interacts with, or perhaps different gods with their own personalities and motives.
The main character is, of course, the player who can't level up. I can't recall his exact name right now, but he is the central focus of the story as he struggles with his unique situation.
The main character is probably the one who is thrust into this hero - summoning world. They might be an average person with no special powers initially. And then, the summoned heroes would also be main characters. They could have different personalities, abilities, and backstories. For example, there might be a heroic knight - type hero with great combat skills, or a mage - type hero with powerful magic. And there may be other characters like the ones who oversee the summoning process or the villains who oppose the heroes and the protagonist.