In some fanfictions, Naruto and Gaara's childhoods are paralleled. Both were outcasts in a way. Naruto was shunned because of the Nine - Tails inside him, and Gaara was feared for the Shukaku. A fanfiction could explore how they might have found solace in each other's similar experiences, had they known about it earlier.
One common theme is the power of friendship. Their bond helps them both grow and overcome their respective traumas. For example, Naruto's friendship gives Gaara a reason to believe in himself more.
One common element is the exploration of their loneliness. Gaara was alone because people feared him, and Naruto was alone as people shunned him. Fanfictions often focus on how they coped with this solitude.
One popular 'naruto and gaara childhood friends fanfiction' is 'The Bond Beyond Sand and Leaf'. It beautifully portrays their friendship from a young age. It shows how Naruto's positive attitude starts to influence Gaara even in their early days.
Well, their childhood bond in a fanfiction could be centered around mutual growth. Gaara had his inner demon to deal with, and Sakura was constantly trying to prove herself as more than just a fangirl. They might have met when Sakura was collecting herbs for Tsunade and Gaara was wandering in the forest. Gaara's calmness in the face of the forest's wildness intrigued Sakura. She started to talk to him, and Gaara found her chatter oddly comforting. This led to them sharing their dreams and fears. Sakura dreamed of being a great medical ninja, and Gaara just wanted to find a place where he belonged. Their conversations could have spurred each other on in their respective paths.
Friendship could be a big theme. Even though they are from different villages, they could form an unlikely friendship in the fanfiction. Maybe they start writing letters to each other secretly. Another theme could be self - discovery. Gaara is trying to figure out his place in the world with the Shukaku inside him, and Sakura is trying to prove herself as a capable ninja.
Well, Naruto could be depicted as being similar to Gaara in their inner strength. Gaara was always strong on the outside but had a fragile heart. Naruto, in this fanfiction, may share that same duality. Maybe he shows Gaara that having a strong will doesn't mean suppressing emotions. He could be the one to show Gaara that it's okay to let others in, since Naruto is always about making friends and bringing out the best in people.
At first, their relationship might be a bit guarded. Gaara, being used to isolation, might be hesitant to open up to Naruto. But as they face challenges together, like fighting a common enemy, they would start to respect each other's strength. Naruto's positive attitude would gradually break down Gaara's walls, and they would become friends.
For Naruto, he could develop a deeper understanding of the pain that Gaara has been through. This might make him more empathetic towards others who seem hostile at first. He might also learn new combat techniques from observing Gaara's use of sand in the heat of the Chunin Exams battles.
One idea could be a story where Gaara travels to different hidden villages in the Naruto world to learn new sand-based jutsu techniques. He meets various characters along the way and has to overcome challenges that test his newfound skills and his friendship with Naruto.