Who could be good crossover characters in an 'Avatar: The Legend of Korra' crossover fanfic?

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 idea could be a crossover with another fantasy world where Korra has to learn new bending techniques from that world's magic users. This would bring a fresh dynamic as she struggles to adapt to different power systems.

Loki and Zuko could be main characters in such a fanfic. Zuko has his own journey of redemption and Loki has his own complex past. They could bond over their struggles with identity and family. Zuko's firebending skills would also be an interesting contrast to Loki's magic. They could either become enemies or form an unexpected friendship as they navigate the challenges in a world that combines the elements of Asgard and the Avatar universe.

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.

Sora from Kingdom Hearts could be an interesting choice. Sora's positive and heroic nature would contrast with Ragna's more brooding personality. They could team up to fight against the Heartless that somehow invaded Ragna's world or vice versa.

Definitely Geralt from The Witcher. His knowledge of monsters and magic could complement the Doom Slayer's brute force. They could work together to hunt down some powerful demons that are causing chaos in both their worlds.

The Joker from the Batman universe could be an interesting crossover character. His chaotic and unpredictable nature would contrast well with Alice's own struggle with madness. He could be the one causing more chaos in Wonderland or wherever the crossover takes place, and Alice would have to find a way to stop him while also dealing with her own mental state.

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.

Korra is surely one of the main characters as it's in her name. Also, Mako and Bolin, her friends from the series, might be important characters in the light novel too.

I think Mako and Bolin could be main characters too. They are Korra's friends and often accompany her in her adventures. Mako is a firebender and Bolin is an earthbender, and they bring different skills and personalities to the story.