The magic in Fairy Tail could be integrated by having mages offer their services to different houses. For example, a Fairy Tail mage could use their healing magic to treat the wounded in a battle for a lord. Or, the destructive magic could be used as a weapon in sieges. Fire - based magic could be like a more powerful form of wildfire in Game of Thrones.
One popular crossover idea is the characters from Fairy Tail facing the political intrigue of Westeros like in Game of Thrones. For example, Natsu could find himself in the middle of a power struggle for the Iron Throne. Another is having the magic from Fairy Tail being introduced to the world of Game of Thrones, which would completely change the dynamics of battles and power plays. And some might imagine the guilds in Fairy Tail getting involved in the wars between the different houses in Westeros.
One interesting plot could be the mages from Fairy Tail being transported to the world of Game of Thrones. They might use their magic to deal with the political intrigue and battles there. For example, Natsu could use his fire magic to fight against the White Walkers, adding a new element to the fight against the undead.
Well, some might argue that Aegon Targaryen with his dragon in Game of Thrones would be very powerful. But if we consider Fairy Tail, Acnologia, the dragon king, would be extremely powerful. If he were to enter the Game of Thrones world, he could easily destroy entire armies and fortresses with his dragon powers.
Another theme is humor. The punishment games are usually designed in a way that can be quite funny. It could be something like a character having to do a silly dance or sing a ridiculous song as a punishment, which adds a light - hearted touch to the story.
It adds more content. The official Fairy Tail series has a limited number of episodes and chapters. Fanfiction fills in the gaps. For example, it can create stories about what the characters were doing during the time - jumps in the original story.
If Lucy never joined Fairy Tail, the friendships and relationships among the characters would form in a very different way. Also, many of the story arcs might not unfold as they do in the original plot.
Erza could be the main character as well. She is extremely strong - willed and disciplined. In a game situation, she would be the one to create strategies and keep the other guild members in line. Her vast combat experience in the real world could translate well into her in - game actions, making her a force to be reckoned with.
One idea could be that the Fairy Tail guild members play a magical board game. In this game, different squares on the board represent various challenges like fighting a powerful dark wizard or solving a complex magic riddle. Natsu might rush in headfirst, getting into all sorts of comical situations as he tries to win the game using his brute strength instead of strategy.
One popular theme is alternate universes (AUs). Writers like to explore what would happen if the Fairy Tail characters were in different settings, like a modern - day high school or a steampunk world. Another common theme is romance. Fans often pair up their favorite characters in different relationships, such as Natsu and Lucy or Gray and Juvia.