A possible fanfiction could have Sakura and Gaara in a situation where they are part of a joint mission with other ninjas. There's a new male ninja on the team who is overly friendly with Sakura. Gaara notices Sakura blushing at the new guy's compliments. Gaara becomes jealous and starts to act more distant towards Sakura. Sakura, not understanding why, gets jealous herself when she sees Gaara spending time with another female ninja from the village who seems to be very interested in him. This creates a cycle of jealousy and misunderstandings between them.
One good example could be a story where Sasuke is getting a lot of attention from a new female character in the village. Sakura becomes jealous seeing them interact so often. In the fanfiction, Sakura might start to distance herself from Sasuke, which makes Sasuke wonder what's wrong. Eventually, he realizes it's because of his interactions with the other girl and has to work to regain Sakura's trust.
One common theme is unrequited love. Often, either Sakura or Gaara may think the other doesn't have feelings for them while they are experiencing jealousy. Another theme is miscommunication. Because of their jealousy, they may not communicate their true feelings, leading to more misunderstandings. For example, Gaara might see Sakura with someone else and assume she's not interested in him, without asking her directly.
One example could be a story where Naruto is in a dangerous mission and Gaara shows up unexpectedly to protect him. Gaara uses his sand powers to shield Naruto from enemy attacks, showing his loyalty and protectiveness.
One good example could be a fanfic where Naruto accidentally spends more time with Ino during a mission, and Sakura gets jealous. In the story, Sakura might start to question her own feelings for Naruto. Another example could be a fanfic where Ino flirts with Naruto to make Sai jealous, but it backfires and makes Sakura jealous instead. There are also fanfics where Naruto has to choose between Ino and Sakura, and the jealousy of the unchosen one drives the plot.
One possible scenario in this fanfiction could be that Sakura realizes her long - hidden feelings for Naruto when she sees Hinata getting closer to him. She might start to act out in small ways, like being a bit more snippy with Hinata during team meetings or training sessions. However, she also has to deal with her own sense of pride and the fact that she once rejected Naruto.
Often in these fanfictions, Sasuke gets jealous when Sakura is training with someone else who is really good at a particular skill. Let's say she's training with Rock Lee to improve her taijutsu. Sasuke might see how dedicated Lee is to helping Sakura and get jealous. He may think that he should be the one helping her. And then he might try to interrupt their training sessions or show off his own skills in front of them to prove that he's better, all because of his jealousy.
One possible plotline could be that Sakura realizes Hinata has a closer relationship with Naruto than she does. So, she starts to feel jealous. For example, she might notice how Naruto always seems to have a soft spot for Hinata's gentle nature. This could lead to Sakura trying to prove herself better in Naruto's eyes, like training extra hard or taking on more difficult missions.
One great example could be a fanfic where Sakura gets jealous when a new female character shows interest in Sasuke. The writer might explore Sakura's insecurities and how she deals with her jealousy. Maybe she tries to prove herself more worthy of Sasuke's attention. Another example could be Sasuke getting jealous when he sees Sakura being too friendly with another male ninja. This could lead to some interesting confrontations and revelations about his true feelings for Sakura.
One possible story could be that Sakura goes to the Sand Village for a medical mission while Gaara is Kazekage. They start to interact more, and Gaara is impressed by Sakura's strength and kindness. Eventually, they form a strong friendship that helps in strengthening the bond between the Leaf and Sand villages.
A plot could involve a situation where Gaara and Sakura are in a relationship, and Gaara's possessiveness is a result of his past traumas. He's afraid of losing Sakura like he lost so much in his childhood. So he constantly hovers around her, which at first Sakura finds a bit suffocating. But as she understands his reasons, she tries to help him deal with his insecurities. And in return, Sakura's possessive side shows when other female ninjas show an interest in Gaara. She might use her medical ninja skills to subtly show her superiority in taking care of Gaara.