One possible storyline could be that Natsu loses his arm during a particularly intense battle in the Grand Magic Games. This then becomes a source of internal struggle for him as he has to adapt to fighting with one less limb. He might also face discrimination or pity from some of the other competitors, which would fuel his determination to prove himself even more.
In some fanfictions, Natsu might lose an arm in a powerful battle during the Grand Magic Games. Maybe he overestimates his strength while facing a super - strong enemy and in a moment of distraction or miscalculation, the enemy lands a fatal blow on his arm, severing it.
Well, he might face difficulties in combat. Without an arm, his physical attacks could be less powerful and his balance might be off. He would probably have to rely more on his magic and learn new ways to fight.
Maybe the main antagonist is an ancient evil that has been awakened by the chaos of the Grand Magic Games. This entity sees Natsu as a threat to its plans and attacks him, resulting in the loss of his arm. The evil being would then continue to try and disrupt the games and cause more harm to the magical world while Natsu and his friends try to stop it.
In this fanfiction, once Natsu loses his arm, the story progresses in several ways. At first, there's shock and sadness among his friends and the guild. Natsu has to come to terms with his new reality. He starts to train differently, focusing more on his magic control. There could be a sub - plot where an enemy tries to take advantage of his weakened state. But Natsu, with the help of his friends, overcomes these challenges. He may also meet some new characters who have knowledge about arm - restoration magic or something similar. As he embarks on this journey, the story could explore themes of perseverance, friendship, and the power of the human (or in this case, dragon - slayer) spirit.
Well, in some fanfictions, there are storylines where the Grand Magic Games are rigged. Natsu and his friends then have to expose the conspiracy while still competing. This adds a whole new layer of drama and intrigue. There could also be a story where a new type of magic is introduced during the games, and Natsu has to quickly adapt to be able to compete against those who already know how to use it.
He might have to adjust his fighting style. Without an arm, his balance and physical power would be affected. He may rely more on his legs and other parts of his body for combat.
Perhaps Natsu sacrifices himself to save his friends or guild. In the heat of a battle during the Grand Magic Games, he might put himself in the line of a fatal attack meant for someone else, like Lucy or Gray, and die heroically.
One great aspect of fanfictions about Natsu and Lucy in the Grand Magic Games is the potential for character development. Writers can explore their relationship in the high - stress environment of the Games. For example, they might show how Natsu's protectiveness towards Lucy intensifies during the battles. It also allows for creative interpretations of their magic abilities. Maybe a fanfic could have Lucy discover a new spell to support Natsu in a crucial moment.
Natsu being 'godlike' in the Grand Magic Games in fanfiction could mean he has extraordinary powers. Maybe he has a new form or has mastered a super - powerful spell. It could make for an exciting read as he overcomes his opponents in unexpected ways.
He might have to withdraw from the games, which could greatly impact his team's chances of winning.