Avatar Wan's story is really interesting. He was the first Avatar. In a world where the spirits and humans were more separated than ever, Wan was a bit of an outcast among humans. He learned to live among the spirits in the Spirit World, which was a very unusual thing at that time. Through his adventures there, he gained the ability to bend all four elements and became the first Avatar, uniting the human and spirit worlds in a way that had not been done before.
Avatar Wan started as an outcast among humans. He entered the Spirit World, befriended spirits, mastered bending, and with Raava, became the Avatar, bridging the human - spirit divide.
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.
The Legend of Korra game story follows Korra as she battles various enemies. She uses her bending skills, like water, earth, fire, and air bending. There are different levels where she has to face challenges and protect the world from those who want to disrupt the balance of the four nations.