Another plot could revolve around the human sister discovering a hidden power within herself that has been dormant all this time. This power could be related to the Mikaelson family's magic in some way, and she has to learn to control it while also dealing with the danger it attracts from other supernaturals. For example, a group of witches might see her as a threat and try to eliminate her.
One idea could be the human sister getting caught in the middle of a vampire - werewolf feud because of her relation to Hope. Maybe she tries to broker peace between the two factions using her unique position as a human in a supernatural - filled world.
A possible plot is that the human sister falls in love with a supernatural being who is an enemy of the Mikaelson family. This creates a huge conflict within the family and also puts the sister in a dangerous position. She has to decide whether to follow her heart or stay loyal to her family. It could also explore how Hope reacts to this situation and whether she can accept her sister's choice.
Well, a plot could revolve around Hope having visions of Klaus's future. In these visions, she sees that he's in great danger from an ancient evil that is about to be unleashed. So, she sets out on a journey to find a way to prevent this from happening. Along the way, they have to face their own personal demons as well. Maybe Hope has to come to terms with her anger towards Klaus for not being there for her all the time. Another plot could be that Klaus is cursed and Hope is the only one who can break the curse, but it comes at a great cost to her powers.
One idea could be that Hope discovers she's pregnant during a time of great turmoil in the supernatural world. She has to hide her pregnancy to protect her unborn child from those who might want to use it for their own gain. Maybe she goes into hiding with a trusted friend or family member.
One idea could be a crossover where Percy and Hope team up to fight a common enemy that threatens both the demigod and the supernatural worlds. Maybe an ancient evil that has the power to disrupt the balance between the gods and the vampires/werewolves/etc.
One idea could be that Hope Mikaelson, with her powerful witch abilities, is somehow transported to the Marvel universe. She could end up at the X - Men's school and learn new ways to control her powers from Professor Xavier. Another plot could involve her teaming up with Scarlet Witch. Since they both have strong magic, they could face a common enemy like a powerful dark magic - based villain who is threatening both the Vampire Diaries - related world and the Marvel world.
One idea could be that Hope, with her unique powers as a Mikaelson, visits Hogwarts for a special exchange program. She could end up befriending Harry and together they face a new dark threat that combines the magic of the wizarding world and the supernatural powers of the Mikaelsons. Maybe a dark wizard is trying to harness the power of the Mikaelson bloodline for some evil spell, and Harry and Hope must stop it.
One plot idea could be Bella's struggle to adapt to the Mikaelson family's vampire - werewolf drama while also dealing with her own newfound vampire - like powers as part of the family. Another could be her relationship with Klaus. Maybe she tries to temper his more violent tendencies and in the process, they form a unique bond that changes the family dynamics.
One idea could be that Hope, being a powerful witch herself, is sent to Hogwarts on an exchange program. There, she meets Harry Potter and they bond over their shared experiences of being different from their peers. Another plot could involve a dark magic threat that only their combined powers can defeat. They start as strangers, but as they train together, they develop a deep friendship and mutual respect.
One idea could be that they discover a shared power that only they can control together. They initially struggle with their relationship due to the taboo nature of it, but as they learn more about this power, they start to see each other in a new light and form a strong bond.
A possible plot is that the lost sister was sent to another dimension by a powerful witch as a means of protecting her from the chaos in the Mikaelson world. In the fanfiction, she grows up in this strange dimension, learning different forms of magic. When she finds a way back to her own world, she meets Hope. Together, they have to face a new enemy that is targeting the Mikaelson family because of their combined power.
She might also use her magic. Hope could put protective spells around her sister's living area or on her sister directly. This would make it difficult for enemies to harm her. For example, a spell that alerts Hope whenever someone with malicious intent approaches her sister.