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.
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.
Well, there are many out there. However, it really depends on what you're looking for in a 'fairy tail x rave master fanfiction'. If you like adventure - based ones, look for stories where the main characters from both universes team up to go on a quest. For example, Natsu from Fairy Tail and Haru from Rave Master could join forces to defeat a powerful new enemy that threatens both their worlds. These types of stories often have exciting battles and interesting character dynamics.
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.
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.
You can start by looking on fanfiction.net. It has a large collection of various fanfics, and there are likely quite a few Haru x Elie ones there.
Some ryuji x haru fanfiction might focus on how they support each other's growth. For example, a story could show Haru helping Ryuji with his studies while Ryuji encourages Haru to be more assertive in her personal and social life. You can search for such fics by using relevant tags on fanfiction platforms.
Well, some kazu x haru fanfiction might be found on FanFiction.net as well. However, the quality can vary a lot. You should look for stories with high review scores and a lot of favorites. Maybe start with the ones that are recently updated, as they are more likely to be ongoing and engaging.
Well, 'The Unlikely Bond' is also a popular hibari x haru fanfiction. In this story, they are forced to work together on a school project. At first, they clash due to their different approaches. But as time goes on, they realize that they have more in common than they thought. It's a really interesting read that shows their relationship evolving in a very natural way.