Love and acceptance are also prevalent themes. Matsuri's love for Gaara can be a driving force for Gaara to accept himself more fully. In many fanfics, Gaara has had a difficult past, and Matsuri's love helps him move forward. Additionally, the theme of protection is common. Gaara, being a strong shinobi, often has the instinct to protect Matsuri, and this protective nature is explored in different ways in the fanfics.
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.
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.
One common theme is the overcoming of Gaara's past traumas in the context of a relationship with Matsuri. Another is Matsuri's support for Gaara as he takes on his role as Kazekage. Also, the idea of them finding solace in each other in a world full of shinobi battles is quite prevalent.
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.
One common theme is the exploration of opposites attracting. Gaara and Deidara are very different in nature. Gaara is more reserved and in touch with his inner self, while Deidara is outgoing and flamboyant in his own way. Their differences often lead to an interesting exploration of how they can come together.
Friendship is a very common theme. Given their initial meeting in the Naruto series and how Naruto was able to reach out to Gaara, fanfics often expand on this friendship. Another common theme is mutual understanding. Since they both had difficult pasts, understanding each other's pain and growth is often explored.
One common theme is friendship. Given their initial differences and how they come from rival villages, fanfics often explore how they can form a bond of friendship. Another theme is understanding. They both have complex pasts and personalities, so understanding each other's motives and pain is often explored.
Another theme is mutual respect. They both have unique skills. Gaara with his sand control and Lee with his taijutsu. Fanfics often show how they come to respect each other's abilities. In some, they even learn from each other, like Lee teaching Gaara about the value of hard work and Gaara showing Lee how to be more in tune with his inner self.
A prevalent theme is understanding. Given their different backgrounds and personalities, a lot of fanfics focus on how they come to understand each other. For example, Sakura may understand Gaara's loneliness due to her own experiences of feeling alone at times. Also, the theme of growth is common. As they interact, both Gaara and Sakura grow as characters, becoming more empathetic and stronger in different ways.
Redemption is also a theme that can be found. Maybe Deidara, who has done some bad things in the Naruto universe, can find a form of redemption through his relationship with Gaara. And for Gaara, it could be about helping someone who seems lost. It's often about two broken souls finding solace in each other. The fics may also deal with the power dynamics between them, considering their different abilities and standings in their respective villages.