Obviously Naruto and Korra could be main characters. Naruto with his experience with the tailed beasts would be crucial in dealing with the Juubi. Korra, as the Avatar, has the power to bend all four elements and could use her abilities in new and creative ways to fight against the Juubi.
Sasuke could also be a main character. His sharingan and his combat skills would be very useful in a story involving the Juubi. In addition, characters like Mako and Bolin from Legend of Korra could play important roles. Mako's firebending and Bolin's earthbending could provide unique support in battles against the Juubi. They could also learn from the Naruto characters and develop new skills.
Obviously Naruto is one of the main characters. Given the title, he has a significant connection to the Juubi in this fanfiction.
One possible plot idea could be a crossover where characters from Naruto and Legend of Korra have to team up to face the Juubi. Maybe the Avatar from Legend of Korra discovers a new power that is linked to the chakra of the Juubi in the Naruto world.
Itachi from Naruto is extremely popular in fanfiction. His sacrifice and the mystery surrounding his actions are very appealing to writers. They often create stories that explore his true motives and what could have been different. As for The Legend of Korra, Asami is a popular character. Her intelligence, strength, and relationship with Korra are often the focus of fanfiction, whether it's exploring their friendship or a potential romantic relationship.
From the Selda side, Link could be a main character. He is used to fighting against great evils in his own world. If the Juubi were to invade, Link would be a natural ally for Naruto and the others. His skills with the sword and his ability to navigate through different terrains would be very valuable in a battle against the Juubi - influenced threats in the Selda world.
Obviously Naruto would be the main character. As for the harem, characters like Hinata could be part of it. She has always had feelings for Naruto. Sakura might also be involved as she has been an important part of Naruto's life. And perhaps some new female characters could be introduced, like a powerful kunoichi from a far - off land who senses Naruto's new power from the Juubi and is drawn to him.
The main character is Korra, of course. She's the one with all the bending powers and the responsibility of the Avatar. But it's not just her. Her friends play important roles too. Mako, the strong - willed firebender, and Bolin, the fun - loving earthbender, are likely to be main characters. Asami, the intelligent and resourceful non - bender, also has a big part to play. She brings a different perspective to the group with her knowledge of technology and business. And there may be other characters from the 'The Legend of Korra' universe that are central to the story in the graphic novel, like Tenzin, Korra's airbending teacher, who could also have a significant role in guiding Korra or being involved in the overall plot.
Korra is surely one of the main characters. She is the Avatar after all.
Korra is the main character. She's the Avatar, a powerful being with the ability to bend all four elements. Asami is also a main character. She's a non - bender but is very intelligent and a great inventor. Mako and Bolin are brothers. Mako is a firebender and Bolin is an earthbender, and they are important characters in Korra's journey.
There could be a kunoichi who is a master of stealth and espionage. She might be the first to discover Naruto's arrival in the kunoichi world. Another main character could be a kunoichi with a strong sense of justice, similar to Naruto. She would be the one to advocate for Naruto when others are against him. And perhaps there's a kunoichi who has a special connection to an ancient power in this world, and she and Naruto's Juubi power somehow interact in an unexpected way throughout the story.
A descendant of a long - forgotten fire - bending clan that was known for their black fire abilities could be the main character. This character might have grown up not knowing about their special heritage until certain events unfold that awaken their black fire powers.