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.
A great fanfiction idea is that Sasuke is jealous when Sakura is chosen to go on a mission with a group of other ninjas, and he's not included. He secretly follows them and ends up saving the group from a dangerous situation. Sakura realizes that Sasuke's jealousy was actually his way of showing he cares about her, and this event brings them closer together.
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.
I really like the fanfiction titled 'Sakura's Jealous Rage'. It delves deep into how Sakura's jealousy affects her relationship with Naruto and their friends. She starts to act out in small ways, like being overly critical of Naruto's decisions. It also explores how Naruto is oblivious to her jealousy at first, which adds an interesting dynamic to the story. There's also a story where Sakura's jealousy is intertwined with her insecurities about her own ninja skills compared to Naruto's rapid progress.
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.
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 example could be a story where Sasuke gets extremely protective when other guys show interest in Sakura. He might glare at them or subtly put himself between Sakura and the potential suitors. In some fanfictions, Sasuke's possessiveness could lead to him being more open about his feelings for Sakura, like giving her special gifts or spending more time with her than he usually would.
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.