In the 'king of the gods light novel', the king of the gods is bound to be a central character. He may have a queen or consort who is also important. Additionally, there could be rebellious gods who are trying to overthrow him, and these would be main characters as well. There might be a seer or prophet among the gods who foretells events and guides the actions of the king, and that character would also be key to the story.
The main characters could include the king of the gods, of course. Then there might be his trusted lieutenants among the gods, who help him in his rule or in his battles against enemies. There could also be a mortal or two who somehow get caught up in the affairs of the gods, and they might play a significant role in the story, perhaps even influencing the king of the gods in some way.
In a light novel about the king of gods, apart from the king himself, there could be a young hero or heroine who has a special connection with the king of gods. This character might start as an ordinary being but through some events, becomes involved in the affairs of the gods. There could also be a powerful antagonist, perhaps a dark god who wants to overthrow the king of gods and take over the divine realm. And there may be some side characters, such as the messengers of the gods or the guardians of the king of gods' palace.
There could be a hero - type character who is either a god or has a special connection to the gods. This character might be on a quest to either overthrow the existing order in the godly world or to save it from some great threat. There may also be other supporting gods with their own personalities and motives that interact with the main character.
The main character is unnamed at first but gradually earns a name as he progresses in his journey to master the gods. There are several antagonist - like gods who oppose him. For example, there is a goddess of darkness who tries to thwart his plans. And on his side, he has a few mortal friends who, though not as powerful as the gods, provide him with emotional support and practical help in his adventures.
Since I haven't read it, I can't say for sure. But likely the ten gods are main characters.
In 'Leveling with Gods' light novel, the protagonist is central to the story. They are the ones who drive the plot forward through their leveling - up adventures. There may be side characters like a wise old wizard who gives advice, or a brave warrior who teams up with the protagonist in battles. These characters each have their own personalities and backstories that add depth to the overall story. For example, the wizard might have a past connection to an ancient magic that becomes relevant later in the story. And the warrior could be on a personal quest for revenge that intersects with the protagonist's goals.
There is also a powerful demon lord. This character is often in conflict with the gods and has his own motives and goals. He is a complex character with both fearsome and somewhat sympathetic aspects. And there are some important god - like figures as well. They have their own hierarchies and different personalities, some are benevolent while others are more strict and unyielding in their ways.
I don't know the exact main characters as I haven't read the novel. But they are likely to be those who are directly involved in the journey of ascending the gods.
I'm not entirely sure as I haven't read it fully, but usually in such novels, there is a protagonist who is the 'chosen one'. This character is likely to have some special abilities or a destiny related to the gods.
I'm not entirely sure about all the main characters, but typically there is a protagonist who is on the journey of leveling up. There might also be a mentor - like figure who helps the protagonist understand the world of leveling and the gods.
Probably other gods like Hera, his wife, will be important characters. Their relationship is complex and full of drama. Also, Poseidon and Hades, his brothers, might make appearances as they are significant in the Greek pantheon. There could also be some mortal characters that Zeus interacts with, such as Europa or Danaë, as Zeus was known for his affairs with mortals.