Some interesting plots might include that Hermione's siblings are actually more powerful than her in certain areas of magic, which causes Hermione to feel a bit of envy at first but then they learn to work together. Another could be that her siblings are adopted, and they find out their true magical heritage together. Also, her siblings could be the key to solving a mystery that has been plaguing the wizarding world for years, and Hermione has to help them figure it out.
One idea could be that her siblings are also magically gifted but in different ways than Hermione. For example, one might be excellent at potion - making while Hermione is known for her academic knowledge. Another plot could be that they get separated at a young age due to some dark wizard threat, and the story is about their journey to find each other again. A third idea is that her siblings are muggles and Hermione has to keep her wizarding world a secret from them, which creates a lot of comical and tense situations.
A plot could involve Hermione's siblings being sorted into different houses at Hogwarts. This could lead to some family tension as they have different values based on their house characteristics. Or perhaps her siblings are part of a secret society within Hogwarts that Hermione discovers later. It could also be that her siblings are in danger from a new dark force, and Hermione has to use all her skills and knowledge to protect them.
One idea could be that as siblings, they discover a hidden magical ability that only runs in their family. For example, they might find out they can communicate with magical creatures in a unique way. This could lead them on an adventure to protect these creatures from dark wizards who want to use them for evil purposes.
Well, a possible plot could be that Draco and Hermione, as siblings, are both sorted into different houses at Hogwarts. They initially struggle with their loyalty to their houses while also trying to figure out their new relationship. There could also be a plot where they discover a common enemy within the wizarding world who is trying to harm their family, and they must use their combined skills to defeat this foe.
In some fanfics, Naruto's sibling could be a prodigy in a different area than Naruto. For example, while Naruto is good at combat and making friends, his sibling could be a master of stealth and espionage. Their different skills could lead to interesting team - ups or rivalries. Also, their relationship could be tested when the village's safety is at stake and they have different ways of handling the situation.
One idea could be that Hermione discovers her angel wings during a dangerous adventure in the Forbidden Forest. The wings give her the ability to fly and she uses this new power to rescue her friends from a menacing creature. Another could be that she has the wings from birth but has been hiding them in the wizarding world for fear of being different. But when Hogwarts is in a great peril, she reveals her wings to save the school.
A possible plot is that they discover the baby has a very rare magical ability. This leads them on a journey to find out more about it. Maybe they have to travel to a far - off wizarding land where they meet other witches and wizards with similar powers. Along the way, they face challenges like protecting the baby from those who might want to use its power for bad. Also, the baby could bring Ron and Hermione closer as they work together to figure out this mystery about their child.
A good plot could be them trying to solve the mystery of their parents' past. Since Hermione is a Muggle - born in the original story, this fanfiction could rewrite her backstory to be related to James. They could find out that their parents were involved in some sort of secret magical society that was disbanded years ago, and now they are facing threats from remnants of that society. Another plot might be that they both have a special connection to a magical creature. For example, they discover that they can communicate with a Phoenix that has been guiding their family for generations. They then have to protect the Phoenix from dark wizards who want to use its powers for evil.
One plot idea could be that they discover they are siblings through some long - lost family secret. Then they have to navigate the new relationship while also dealing with the threats to their village. Another could be a story where they go on a journey together to find out more about their family's past.
Another plot idea is that they explore their family history together. Since Naruto has always been an orphan and Tenten's family background isn't explored much in the original series, they could embark on a journey to find out more about their parents. Along the way, they would face many obstacles and meet various characters who either help or hinder their search, all while growing closer as siblings.
A possible plot in this fanfiction could be that Naruto and Sakura, as siblings, inherit a special jutsu from their ancestors. They have to figure out how to master it together. In the process, they get into all sorts of adventures. They might have to deal with a corrupt ninja in their village who wants to steal their inheritance. Their relationship as siblings would be a source of strength and support, as they rely on each other's unique abilities. For example, Naruto's determination and Sakura's intelligence would complement each other in solving problems.
One idea could be exploring their family history. Maybe they discover they have a common ancestor who was a powerful ninja. This could lead to them uncovering hidden jutsu or secrets within their family lineage.