Rather than seeking 'lemon' fanfiction, you can search for fan - created stories that expand on the world - building of 'Avatar The Legend of Korra'. These might include tales about the political unrest in the different nations, or how the technology in the show affects the daily lives of the characters.
Sure. One great fanfiction site is Archive of Our Own (AO3). There are many stories that blend the two universes. For example, some fanfics might explore what would happen if characters from 'The Legend of Korra' time-traveled back to the era of 'Avatar: The Last Airbender'. Another option is FanFiction.net, where you can find a wide range of fan - created stories with different themes, like crossovers where Korra meets Aang and they have to face a new common enemy together.
One idea could be exploring the backstory of a minor character. For example, delving into the early life of a non - bender in Republic City and how they coped with living in a world where benders had more influence. Another idea is to create an alternate timeline where Korra fails to restore the balance and how the world descends into chaos as a result. Or perhaps a fanfiction centered around a new romance between two characters that were not paired in the original series.
One idea could be exploring Korra's life after she restores balance. Maybe she travels the world teaching the new generation about bending. Another could be a story where she has to face a new, unknown threat that challenges her in different ways than before.
Asami could be a key character in many crossovers. Her engineering skills could be valuable in different settings. For instance, in a crossover with a steampunk world, Asami could collaborate with the local inventors, using her knowledge to upgrade their machines and also learn from their technology while still being able to use her martial arts skills when needed.
One plot idea could be that your OC discovers a long - lost bending technique. This could attract the attention of both good and bad forces. For example, the Red Lotus might want to use it for their own purposes, while Korra and her friends would try to protect it. Another idea is that your OC is an ambassador from a small, previously unheard - of tribe. They come to Republic City to establish relations, but face many challenges due to cultural differences and political intrigue. Or perhaps your OC has a prophecy about the future of the Avatar world and has to convince everyone, including a skeptical Korra, that it's real.
I've heard of a fanfic where Dark Avatar Korra is on a journey to restore balance in a world that has turned against the Avatar. It's a great read as it shows her using her unique powers in creative ways. The author really captures her new, edgier personality.
The 'lemon' aspect might be a bit hard to come by in a clean way as it often involves inappropriate content. But for normal Korra and Mako fanfictions, you could also try FanFiction.net. Some stories there might show their relationship developing, their adventures together, and how they support each other, which can be really interesting to read.
One great fanfiction is 'The New Team' which combines elements from both universes in an exciting way. It has a unique plot where characters from Young Justice and The Legend of Korra team up to face a common threat.
Well, there's 'Naruto in the World of Korra'. In this fanfiction, Naruto is somehow transported to the world of Legend of Korra. It's a great read as it shows how Naruto's skills and personality would fit into this different setting. There's also 'Airbender's Influence on Naruto' which explores how the concepts of airbending could be incorporated into Naruto's ninja world.
One idea could be a crossover with another popular fantasy world like 'Harry Potter'. Korra could end up at Hogwarts and have to deal with magic in a completely new way. Maybe she'd use her bending to enhance or counter some spells.