Since I don't know the exact 'new avatar story', it could be a new avatar as the main character. Maybe there's also a wise old guide to help the avatar on their journey.
In the 'new avatar story', the main character could be the new avatar, of course. But there could also be an antagonist, perhaps a powerful sorcerer who wants to control the avatar's power for their own evil purposes. There might also be a love interest for the avatar, which could add an emotional depth to the story. And let's not forget about the avatar's family members. If the avatar is a young person, their parents or guardians could play important roles, either as a source of support or as a complication in the avatar's journey.
I really don't have enough information to name the main characters. But thinking about common avatar stories, there could be a young avatar who is just discovering their powers. They might be joined by an older, wiser character who has knowledge of the avatar world. There could also be a group of friends or allies who each have their own unique skills and personalities. And of course, there could be an enemy or a group of enemies who are out to disrupt the balance in the avatar world that the main characters are trying to protect.
Since I don't know the specific 'Avatar Love Story', it could be a male and a female avatar. Maybe they have unique names or identifiers within the virtual world.
In 'kings avatar side story', we should expect to see Ye Xiu as one of the main characters as he is the central figure in the 'King's Avatar' series. Alongside him, there could be other members of his team, such as Su Mucheng. There may also be characters from rival teams who play important roles in these side stories, perhaps in some sort of special events or competitions that are not part of the main storyline. And, as mentioned before, new characters might be introduced to enrich the side stories.
Most likely, the main characters from 'The King's Avatar' will also be important in the side story. So, Ye Xiu would probably be one of the main characters.
Aang is a main character. He's the last airbender and the Avatar, who has to master all four elements to bring balance to the world. Katara, a waterbender from the Southern Water Tribe, is another important character. She helps Aang on his journey. And Zuko, the banished prince of the Fire Nation, is also a key figure as his story of redemption is a major part of the plot.
Avatar Kyoshi herself is a main character, obviously. There may also be her friends, allies, and perhaps some antagonists she has to face.
Since we don't know the exact details of the 'King of Avatar Novel', it's hard to say for sure. However, we can assume that the main character is the one who holds the title of 'king of avatars'. There may be other important characters such as advisors who help the king make decisions, or rivals who are vying for the power that the king holds. Maybe there are also characters from different regions or groups within the avatar world that interact with the king in various ways.
In the movie 'Avatar', the main characters include Jake Sully. He is the human who becomes involved with the Na'vi through his avatar. Neytiri is also a key character, a Na'vi female who helps Jake understand and embrace the Na'vi way of life. Then there is Colonel Miles Quaritch, who represents the human military's aggressive and greedy side, trying to take over Pandora's resources at any cost.
The main characters in the Avatar original story are diverse. Aang, as the Avatar, is central. He has a kind heart and a sense of responsibility that grows as he matures. Katara is not only a powerful waterbender but also a compassionate friend. Sokka brings humor and strategic thinking to the group. Zuko's struggle with his identity and his quest for redemption make him a fascinating character. Iroh, with his tea - making and profound wisdom, provides a moral compass for Zuko. Additionally, there are characters like Toph, a blind earthbender who is extremely powerful and independent, adding more depth to the story.
The main characters in the original avatar story include Jake Sully. He is a human who becomes an avatar and plays a crucial role in the story. Neytiri is also a main character, a Na'vi female who Jake falls in love with. Then there's Colonel Miles Quaritch, the antagonist who is determined to carry out the human mining operations on Pandora at any cost.