I'm not sure which specific fanfiction is the best, but you can also try searching on Tumblr. Sometimes, fans post snippets or links to their own Haru x Elie fanfiction there. It might be a bit more scattered compared to the other two platforms, but you could stumble upon some really creative and unique takes on their relationship.
A common theme is adventure. Since they are part of the Rave Master story, many fanfictions have them going on quests and battles together. Another theme is friendship evolving into love. Their initial bond as comrades gradually turns into something more romantic as the story progresses in a lot of fan works.
I'm sorry, but I don't have specific fanfiction to recommend directly. You could try searching on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'elie and haru' in their search bars and explore the available stories.
In 'elie and haru' fanfiction, one common theme is self - discovery. Both characters could be on a journey to find out more about themselves, and their relationship helps in that process. Also, the theme of loyalty often appears. They might show loyalty to each other in different situations, whether it's facing an enemy or making a difficult choice. There could also be a theme of growth, where they both grow as individuals and as a pair throughout the story.
First, focus on building their characters. Describe Haru's personality traits, like his kindness or his determination. Do the same for Elie. Then, create a believable setting. It could be a bustling city street or a quiet meadow. Next, build up the tension slowly. Maybe they have a series of near - misses before the kiss. For example, they almost kiss in a moment of excitement but are interrupted. This will make the actual kiss more impactful.
I really like 'Haru and Elie: Unlikely Bonds'. This fanfic focuses on the unique connection between them. It has a lot of heartwarming moments where they support each other. The author does an excellent job of developing their characters within the story.
There is also 'Naruto in the Rave Realm'. In this fanfiction, Naruto gets transported to the Rave Master universe and has to learn new skills and make new alliances to survive. It has an interesting plot that keeps you hooked.
One possible plotline could be that Haru and Elie are friends who gradually develop deeper feelings. They might be in a dangerous situation together, like facing a powerful enemy in a fantasy world. In that moment of high tension, they realize their true feelings and share a kiss. It could be a turning point in their relationship, leading them to fight even harder to protect each other.
Some fanfiction communities on Reddit might also be a good source. There are subreddits dedicated to Fairy Tail and fanfiction in general. You can post a request for 'the rave master of fairy tail fanfiction' and chances are that fellow fans will point you in the right direction with some great suggestions.
One popular Rave Master Crossover Fanfiction might be the one where the characters cross over with Fairy Tail characters. The story could explore how the magic systems interact. Another could be a crossover with One Piece, imagining the Rave Master crew sailing on the Grand Line. And there could also be a crossover with Naruto, where the ninjas and the Rave Master's gang face off against a common enemy.
The plot is crucial. It should be engaging and make use of the rich magic and world - building elements from both Fairy Tail and Rave Master. A fanfiction that simply throws the characters together without a proper plot won't be very good. For instance, a story about a common enemy that requires the combined powers of both groups of heroes can be very exciting.