The appeal lies in the characters themselves. Jinora is a strong - willed and spiritual character, while Kai is more of a free - spirited adventurer. Their combination makes for an interesting dynamic in fanfiction.
There's a fanfiction called 'Bond Beyond Worlds'. In this story, Jinora and Kai's relationship blossoms as they embark on a quest to save a group of endangered spirits. It has a really engaging plot that keeps you hooked from start to finish. The way it delves into their personalities and how they interact is really well - done.
The Legend of Korra comics are definitely worth a read. They capture the essence of the franchise and bring fresh perspectives. The quality of the storytelling and the visuals make them a great addition to the series.
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.
To be honest, I don't have an exact figure. But you can look up on popular comic book databases or ask in comic book enthusiast communities to get a clear idea of how many The Legend of Korra comics are out there.