One possible plot could be that Gray is kidnapped by a group of rogue mages who want to study his unique magic. They believe that by dissecting his powers, they can gain some sort of advantage in the magical world. Gray, being the tough character he is, tries to resist and escape on his own while also leaving clues for his friends. His friends from Fairy Tail, led by Natsu perhaps, follow the clues and have to battle the kidnappers and their minions to rescue Gray. Along the way, there could be revelations about Gray's past or some hidden aspects of his magic that even he didn't know.
I'm not sure specifically if there is a fanfiction solely about Gray Fullbuster being kidnapped. There are so many fanfictions in the Fairy Tail fandom, and while kidnapping plots are common, it might be a bit rare to find one that focuses only on Gray in this situation. You could try searching on major fanfiction websites like Fanfiction.net or Archive of Our Own.
Since 'lemon' fanfiction often crosses the line into adult content, we should focus on the proper characteristics of Gray in regular fanfiction. Gray is known for his stoicism, his rivalry with Natsu, and his strong sense of justice. These traits should be the focus rather than any improper aspects that might be in 'lemon' fanfiction.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfictions, and you can search specifically for Gray Fullbuster ones. There are also some dedicated Fairy Tail fanfiction forums where users share their works.
The plot also matters a great deal. It could be an adventure where Gray and the OC team up to defeat a powerful enemy, or it could be a more character - driven story about them dealing with personal issues. A good plot keeps the readers engaged and makes them want to keep reading to find out what happens next. Additionally, the writing style should be engaging, with good grammar and vivid descriptions.
Archive of Our Own (AO3) also has a good number of these fanfictions. It has a well - organized tagging system, so you can easily find what you're looking for. Plus, the quality of the writing on AO3 is generally quite high.
One idea could be that the OC is a new mage in the guild and Gray initially misunderstands her intentions, thinking she's there to cause trouble. But as they go on missions together, he realizes she has a pure heart and they start to develop feelings. For example, they could be on a mission to save a small village from a dark wizard's curse, and the OC uses her unique magic to break the curse, impressing Gray.
One common theme is romance. Since Gray is a popular character, many fanfictions might pair the female version of him with other characters from Fairy Tail, like Natsu or Lucy, exploring different romantic relationships. Another theme could be adventure. Writers might create stories where female Gray embarks on quests or battles similar to what we see in the original series.
Well, in the world of Gray Fullbuster OC fanfiction, there are stories where the OC has a special connection to Gray's past. Maybe the OC knew Gray's family before he lost them. This could lead to a story full of revelations and emotional moments. Also, there could be a fanfiction where an OC is a time - traveler and meets Gray at different points in his life, changing the course of his story in unexpected ways.
One idea could be a crossover with the Naruto universe. Gray could meet Naruto and they could team up to fight a common enemy. Gray's ice - magic skills would be an interesting contrast to Naruto's ninja techniques.
Well, there are a few. Overcoming insecurities is a big one. Gray might be insecure about his past or his abilities at times, and the OC could have her own insecurities too. Their relationship helps them face and overcome these. Another theme is the exploration of new powers. The OC's power might be something that Gray hasn't seen before, and they work together to understand and use it. And of course, there's the theme of loyalty. As they face various difficulties, their loyalty to each other is tested and strengthened, which is a key aspect in many 'gray fullbuster x oc fanfiction' stories.