Perhaps he's reincarnated as an avatar - like figure, not exactly the avatar but with some special connection to the spirit world. He then has to use this connection to help restore balance in the world. He might encounter different spirits, some friendly and some hostile, and has to find a way to co - exist with them while also dealing with the human problems in the story.
One idea could be that the reincarnated character has memories of their past life. They could use this knowledge to predict events in the Avatar world. For example, they might know about an upcoming threat and start preparing for it much earlier than anyone else. This could lead to some interesting interactions with Korra and the other characters as they try to convince them of the danger.
His character could start off confused about his new life. But as he experiences the world of Korra, he becomes more confident. He might develop strong moral values as he witnesses the inequalities in the different nations. For instance, if he sees how non - benders are treated in Republic City, he could become an advocate for equality.
One way could be through a powerful spiritual ritual. Maybe there's a long - forgotten temple where the spirits are in a state of imbalance. A character from another world or dimension accidentally stumbles upon this place and through some strange energy transfer, they are reincarnated into the Legend of Korra world. The spirits could be trying to correct an old wrong or bring in a new element to help the world, and this character is the key.
The plot could involve a villain from One Piece using the power of bending against the world of Korra. For example, Blackbeard discovers a way to steal bending abilities and starts causing chaos. Korra, in her quest to stop him, meets the One Piece crew who are also affected by Blackbeard's actions. Together, they combine their skills, with Korra's bending and the Straw Hats' various fighting styles and Devil Fruit powers to take on Blackbeard.
One possible plot could be that the girl has some sort of unique ability that Naga senses. Naga licking her could be a way to either gain or transfer some of that power. The story might then revolve around how the girl and Naga interact further because of this connection, and how it affects the overall world of 'The Legend of Korra'. For example, they might have to face some common enemies or challenges together because of the special bond formed by Naga's licking.
There's this fanfiction called 'Male OC: The Firebending Prodigy'. In this story, the male OC is a firebending genius. The story follows his training under some of the best firebenders in the world. It also shows his interactions with other benders and non - benders, which adds a lot of depth to the story.
Well, it could be about Naruto being Korra's brother and them having to face some common enemy together. Maybe they discover some ancient power that only they, as siblings in this fanfic, can control.
Well, one possible plot could be that Korra and Asami decide to start a family together in a modern AU. They face challenges like how to balance their important work with raising a child. Maybe Korra has to deal with her bending powers during pregnancy, like how to control them without endangering the baby.
A Legend of Korra and Star Wars crossover would likely have some really cool character interactions. Aang's spirit could meet Yoda's. They could share their wisdom about the balance of the universe. Also, the technology from Star Wars like lightsabers and starships would be fascinating to see in the world of Legend of Korra. How would the people of that world react to such advanced technology? It could lead to some great storylines about adaptation and progress.
First, create a unique backstory for your male OC. For example, if he's a waterbender, think about how he learned his skills. Maybe he was taught by an old master in a secluded tribe. Second, give him distinct personality traits. He could be a bit of a rebel but with a heart of gold. Third, tie his story into the existing Legend of Korra world. He could be involved in the political unrest or the fight against new villains. This will make the story feel more connected to the source material.