A Mystic Gohan crossover fanfiction could involve the world of One Piece. Gohan could land on the Grand Line and join a pirate crew. He'd have to adapt to the strange new world full of devil fruits and sea kings. His powers would be a great asset, but he'd also have to learn about the different cultures and ways of the pirates. Or, he could cross over into the world of Harry Potter. Gohan at Hogwarts would be a unique concept. He could use his powers to protect the school from dark wizards while also learning about magic.
Well, I'm not entirely sure of a specific 'Mystic Gohan lemon fanfiction' title off the top of my head. But generally, in these types of fanfictions, they might play with Gohan's transformation into Mystic Gohan and add a romantic or more adult - themed relationship. It could involve his relationships with existing characters from the Dragon Ball series like Videl, or it could introduce new characters. To find good ones, you can also check out fanfiction communities where people discuss and recommend their favorite stories.
Perhaps there's a powerful artifact that Gohan touches, and it transforms him into a girl as a form of curse. In this new form, Gohan starts to notice different things about himself and the world around him. He might have to learn new ways to fight and move, as his body is now different. His relationships with his friends like Videl and Piccolo could also change, as they try to help him adapt and find a way to break the curse.
First, decide which universe you want to cross Mystic Gohan with. Then, research that universe to understand its rules, characters, and overall vibe. Next, think of a good reason for Gohan to end up in that new universe. It could be a magical accident, a portal opening, or some other device. After that, start planning the main conflict or story arc. For example, if it's a crossover with the Star Wars universe, maybe Gohan has to help the Rebels fight the Empire. Then just start writing, introducing Gohan into the new setting and seeing how he interacts with the new characters.
Their friendship could start with mutual respect for each other's power. When they first meet, they might have a small sparring match and be impressed by the other's skills. This would lead to them sharing training techniques.
It could be a new villain who is specifically targeting Gohan because of his new form. This villain might see Gohan's transformation as a sign of weakness or an opportunity to mess with the Z - fighters. Maybe they want to use Gohan's confusion and the chaos it causes among his friends and family to their advantage.
First, know the character of Mystic Gohan well. Study his personality, powers, and relationships in the original Dragon Ball series. Then, for the lemon aspect, be careful as it should be tasteful and not overly vulgar. You can start with a plot idea, like Gohan using his Mystic powers in a new and unexpected situation that leads to a romantic encounter.
One plot idea could be that Mystic Gohan and Naruto are brought together by some sort of interdimensional rift. They have to team up to close the rift while also dealing with enemies from both of their worlds. Another idea is that they meet in a tournament held in a neutral dimension. They start as rivals but then realize they can learn from each other's fighting styles.
There were a few novels that could be recommended, including Those Years Living in the Future World of Dragon Ball, If Dragon Ball, Latiz took Gohan away, and The Strongest Sun Gohan of Dragon Ball. These novels all used Gohan as the protagonist, telling his growth and adventures in the Dragon Ball world. These novels might satisfy your need for Gohan to be the protagonist.
Xuanling was a mysterious cultivation technique that originated from the legends of ancient times. At that time, there were many mystical spirits in the world. They were regarded as god-like existences by humans and were worshipped and worshipped by them. Mystical Spirit Cultivation believed that the universe was closely related to the human body, and it was the orthodox method of the Taishang lineage. However, there was not enough information to answer this question regarding the specific content and method of Xuanling's true existence, as well as whether it really existed.