There's also 'Overprotective Ruby' which focuses on Ruby being overly protective of her sister or friends. It has some really interesting scenarios where Ruby's protectiveness gets her into both comical and tense situations. This fanfiction does a great job of exploring Ruby's character in this context.
One common theme is loyalty. The overprotective sister is often extremely loyal to her sibling, willing to go to great lengths to keep them safe. For example, she might put herself in danger without hesitation.
Finding good 'overprotective big sister x reader fanfiction' can take a bit of time. You could also ask in relevant fan communities on social media platforms. For example, on Tumblr, there are often groups dedicated to different types of fanfiction. They might be able to point you to some hidden gems. The best part about this type of fanfiction is that it often explores the relationship dynamics between the two characters in a very emotional and sometimes comical way.
She could also be shown as having a strong sense of worry. Maybe she has nightmares about her partner getting seriously injured in a Grimm attack and then becomes even more overprotective in the real world. She might start to limit his activities outside of the safety of their base or team.
One great 'rwby sister fanfiction' is 'Sisters in Arms'. It focuses on the strong bond between the sisters in RWBY and their adventures together. The story has well - developed characters and exciting plot twists.
One popular 'rwby twin sister fanfiction' is 'The Twin Sisters of Beacon'. It follows the adventures of two sisters at Beacon Academy with unique powers and personalities. Another one could be 'Twin Bond in RWBY', which focuses on the special connection between the twin sisters as they face various challenges in the RWBY universe.
One possible scenario in this fanfiction could be that Naruto's sister constantly interferes in his ninja training. She might think the training is too dangerous for him and tries to stop him from taking on challenging missions. For example, when Naruto is about to go on a mission to the Land of Waves, his sister could try to convince the Hokage not to send him, believing that he's not ready yet. This would add a whole new layer of conflict to the story, not just between Naruto and his sister, but also with the village's expectations of Naruto as a ninja.
One common trope is the overprotective girlfriend being overly cautious about her partner's battles. For example, she might try to keep him from taking on dangerous missions in the RWBY universe. Another is her getting jealous easily when others get too close to her partner during team interactions.
There are many Sonic fanfiction communities out there. Some might have a collection of Sonic Tails overprotective fanfics. You could also check out Sonic - related forums where fans discuss and share their favorite fanfictions. Maybe post a request there asking for Sonic Tails overprotective stories, and fellow fans will be able to point you in the right direction.
Well, 'Percy's Overzealous Protection' is another great one. It explores Percy's overprotective tendencies not just towards his close friends but also towards new demigods at Camp Half - Blood. He tries to shield them from all the perils of the demigod world, and the story unfolds with his efforts causing both admiration and some exasperation among the other characters.
One place to start looking could be Archive of Our Own (AO3). Just search for 'percy is overprotective of nico' in their search bar, and you'll likely find a good number of relevant fanfictions.