Gray could be a great addition. Since Gray has a history with both Juvia and Lyon, his presence can add a lot of drama. For instance, his reaction to Juvia and Lyon getting closer could range from jealousy to acceptance, which would create different story arcs.
A theme that often appears is the idea of redemption or self - discovery within their relationship. Lyon may have his own past mistakes or insecurities that he overcomes through his relationship with Juvia. And Juvia, who has always been a bit of an outcast in terms of her overly - intense emotions, might find a more balanced and healthy relationship with Lyon. This can be a really interesting aspect of Lyon x Juvia fanfictions as it delves deeper into their characters.
One interesting plot could be Juvia and Lyon going on a magical adventure together to find a lost artifact. They might face various challenges along the way that test their skills and relationship.
One common theme is the exploration of love that defies expectations. Since Juvia was initially interested in Gray and Lyon has his own goals, their coming together in fanfics often shows a love that surprises both them and the readers. Another theme is the power of friendship. As they interact, they also form a bond of friendship which then morphs into something more romantic.
The theme of redemption can also be present. If a character has made mistakes in the past, like Lyon perhaps in his rivalry with Gray, the fanfic might explore his journey of redemption. Juvia could be the catalyst for this change as she has a big heart and might encourage him to be a better person. And Gray, on the other hand, could be dealing with his own demons, like his past with Ur, and through his interactions with Lyon and Juvia, he finds a way to move forward and heal.
One great 'lyon x juvia fanfic' could be 'Lyon and Juvia's Unseen Bond'. It delves into their relationship in a really interesting way, exploring how their different personalities interact. Another might be 'A Lyon and Juvia Adventure' which takes them on a journey full of magic and self - discovery. There's also 'Lyon's Heart for Juvia' that focuses on Lyon's feelings for Juvia and how he overcomes obstacles to be with her.
Another place to look is FanFiction.net. Many fans post their works there. However, the quality can vary. When you search for Lyon x Juvia fanfiction, make sure to read the summaries and reviews if available. This way, you can get an idea of whether it's the kind of story you'll enjoy.
Their relationship could develop through shared experiences. For example, if they go on adventures together and rely on each other's magic abilities. They might start off as friends or comrades, and then slowly realize they have deeper feelings as they see the best and worst in each other during tough situations.
One possible fanfiction could involve Juvia initially being hesitant to date Lyon because of her feelings for Gray. But as she spends more time with Lyon, she discovers his own unique charm. For example, Lyon might take Juvia on a magical adventure through the Fairy Tail world, showing her places she's never seen before, which gradually makes her heart open up to him.
One plot idea could be a story where Lyon and Juvia are on a joint mission for the guild. They start off bickering like they used to, but as they face various challenges together, they gradually realize their feelings for each other. Another could be a story set in an alternate universe where Lyon and Juvia are from rival guilds and they have to overcome their guild loyalties to be together. Or perhaps a plot where Juvia gets injured and Lyon has to take care of her, which makes him see her in a new light.