One common theme is growth. Both Gaara and Matsuri often experience personal growth as their relationship develops. For example, Gaara may become more in touch with his emotions, and Matsuri may become more confident. Another theme is loyalty. They are both loyal to their village, and this loyalty can play into their relationship, either as a bond or as a source of conflict.
Well, I think the best 'Gaara x Matsuri' fanfictions are those that give Matsuri a more active role in Gaara's life. She could be his confidant when he's facing difficult decisions regarding the village. Fanfictions that show this kind of partnership between them, where Matsuri isn't just a side character but an important part of Gaara's growth and development, are often really good.
One popular 'gaara x matsuri fanfic' might be 'The Bond Between Them'. It focuses on the relationship development between Gaara and Matsuri. In this fanfic, they start off as acquaintances and gradually grow closer through various adventures in the Hidden Sand Village.
In this fanfiction, their relationship could develop through shared experiences. For example, they could take on a mission together to protect the village. During this mission, they would have to rely on each other's strengths. Gaara's powerful sand abilities and Matsuri's combat skills would make them a formidable team. This shared experience would deepen their bond and make them realize how much they mean to each other.
Since I can't really promote or support 'lemon' (adult - themed) fanfiction, I can talk about general Gaara and Matsuri fanfiction themes. A common theme could be their relationship development, perhaps how Matsuri's admiration for Gaara grows over time. Another theme might be their shared experiences in the Hidden Sand Village and how that bonds them.
There are also dedicated Naruto fanfiction forums. These are places where fans gather to discuss and share their works. You might need to do a bit of searching within the forum, but it's possible to find some hidden gems of 'gaara x matsuri fanfiction' there.
Another way is to join fan communities dedicated to Gaara or Matsuri. People there often share their favorite fanfictions. They might even have a list of recommended 'Gaara x Matsuri' stories. You can also ask for suggestions in these communities. They'll be able to point you in the right direction based on your preferences, whether you like more romantic or action - packed fanfictions.
There's also 'Gaara and Matsuri: A New Beginning'. In this fanfiction, they go on an adventure together outside of the Hidden Sand Village. It shows their different personalities and how they complement each other during the journey.
I'm not entirely sure specifically as it's a fanfiction. It could potentially be about a fictional situation where a character named Gaara Matsuri is pregnant within the context of a fan - created story. It might explore the character's journey during pregnancy, her relationships, and how this new situation affects her life within the fan - made narrative.
Yes, there are quite a few. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Naruto Gaara and Matsuri love' and you'll find a variety of stories with different takes on their relationship.