One common theme is his growth as a character. Many fanfictions explore how Rufus can develop his magic skills further and become more powerful within the Fairy Tail universe.
One possibility is that it focuses on a love story between Lucy and Rufus. They start off as rivals, perhaps competing in a magic competition. But as they get to know each other better, they realize they have more in common than they thought and fall in love. This could involve them sharing their dreams and fears, and overcoming obstacles together to be with each other.
One of the main characteristics of Gray in this type of fanfiction is his loyalty. He is extremely loyal to the Fairy Tail guild, and this loyalty extends to the reader as well. He will go to great lengths to protect the reader, whether it's from external threats like dark guilds or from internal emotional turmoil. His physical attractiveness is also often emphasized, with his well - built physique and his unique style of dressing (or undressing in his case due to his habit of losing his clothes while using magic). This adds to his charm in the eyes of the reader.
Gray is appealing in fanfiction because he's such a complex character. His cool demeanor and his sometimes - brooding nature make him interesting to write about. Writers can play with his emotions and his internal struggles, like his battle against the demons inside him.
Gray is a really cool character in Fairy Tail. In fanfiction, he often gets some interesting storylines. Writers might explore his past more deeply, like his relationship with his family or his early days in the guild. Sometimes, he's paired with other characters in unique ways that we don't see as much in the original series.
In Fairy Tail fanfiction, Gray's twin brother could be a really interesting addition. He might have similar ice - make magic, or perhaps a completely different power. This could lead to all sorts of new storylines, like rivalries between the two brothers or them teaming up against a powerful enemy.
In many fanfictions where Gray confesses to Juvia, it's often a very emotional moment. It might happen after a big battle where they realize how much they mean to each other. Gray could finally admit his feelings that he has been suppressing for a long time. Maybe he sees Juvia in danger and that makes him realize he can't hide his love anymore.
The magic system in Fairy Tail should be well - represented. Since Lucy uses Celestial Spirit Magic and Rufus has Memory - Make Magic, there could be interesting battles or challenges where they combine their powers. For instance, Rufus could remember a weakness in an enemy's magic and Lucy could summon a Celestial Spirit to exploit that weakness.
You can try fanfiction websites like Archive of Our Own or FanFiction.net. They usually have a wide variety of Fairy Tail Rufus fanfictions. Just use the search bar and type in 'Fairy Tail Rufus' to find relevant stories.