A theme that often appears is the role of the sister as a mentor or protector. Since she is older, she has more knowledge and experience. She could use this to guide Draco through the challenges at Hogwarts, like dealing with the other students or the strict rules of the school. Also, the theme of redemption can be seen. If Draco has made some wrong choices, his sister may play a key role in his journey to make amends.
One common trope is the protective older sister. She might be constantly looking out for Draco, especially in the dangerous wizarding world. Another is the 'forbidden friendship' trope. The sister could be friends with characters she's not supposed to be, like a Muggle - born or a member of the Order of the Phoenix. And there's also the 'rivalry' trope, where she might be in competition with other Slytherins or students from different houses.
Another common theme is the discovery of self - identity. The older sister, while protecting Bella, also discovers more about herself. She might find out that she has some hidden powers or abilities. And in the process of dealing with all the Twilight - related events, she learns more about who she really is and what her role is in this strange world.
Love and friendship also play important roles. She forms friendships with characters that her family might not approve of, or she might fall in love with someone unexpected. These relationships help shape her character and her decisions, and they add a lot of depth and drama to the fanfiction stories.
One common theme is family secrets. Since Hermione and Draco are from different families in the original series, there must be some big secrets if they are siblings in fanfiction. Another theme is identity crisis. Hermione might struggle with her new identity as a Malfoy. And of course, there's the theme of redemption. Draco could be influenced by Hermione's good nature and change for the better.
Another theme is redemption. The older brother may be seen as a character who has the potential to redeem the Malfoy name. He could be involved in good deeds that counteract the family's association with the Dark Arts. This can involve helping out other Hogwarts students or working against Voldemort's regime in a discreet way. It's a way of showing that not all Malfoys have to be on the side of evil.
One good Draco has an older sister fanfiction is 'The Malfoy Sibling Bond' on FanFiction.net. It delves into the relationship between Draco and his sister, showing how she influences his actions and decisions. It has a great plot that includes their family dynamics and how they navigate the wizarding world together.
Protection is a common theme. The older sister often tries to protect Naruto from harm. Another theme is growth, where Naruto's development is influenced by his relationship with the sister. Also, family bonds are emphasized, even if it's not a traditional family setup.
One common theme is protection. The sister often tries to protect Sasuke from harm. Another theme is influence, like how she can shape Sasuke's view of the world. And family bonds are also important, showing their strong connection as siblings.
One common theme is family loyalty. The big sister often has to choose between her loyalty to the Malfoy family and her own moral compass. For example, in many fanfictions, she might be torn between supporting Draco in his tasks for the Dark Lord (as per the family's alignment in the original series) and doing what she believes is right.
A big theme is friendship. She has to find her place among the students at Hogwarts. Sometimes she befriends those outside of Slytherin, which can cause conflict within her family. Also, the theme of love often comes up. It could be a romantic love or the love for her family in a more complex way, like trying to redeem her family's name. There's also the theme of dealing with the dark side of the wizarding world, especially considering her family's association with the Death Eaters.