One interesting plotline could be a magical inheritance from the Black family that somehow gets intertwined with the character of Rumpelstiltskin. Maybe Rumpelstiltskin has a claim on the Black family magic due to some ancient deal. Another could be Harry getting involved in this complex situation, perhaps having to solve a mystery related to the strange connection between the two. For example, he might have to figure out how to break a curse that Rumpelstiltskin has placed on the Black family's inheritance.
Well, a plotline could involve Rumpelstiltskin using his magic to manipulate the Inheritance of the Black family. Harry, being the hero, discovers this and tries to stop him. It could be that Rumpelstiltskin wants to use the powerful Black family magic for his own dark purposes. Harry then has to use his own skills and the help of his friends to outwit Rumpelstiltskin. He might also learn some new magic along the way that is related to the Black family's unique magical heritage.
Another plotline might involve Harry inheriting a hidden magical ability from an ancestor. He then has to learn how to control and master this new power while dealing with the challenges it brings, like the envy of some of his classmates and the interest of dark wizards.
Obviously, Harry would be one of the main characters. Given the 'Black' in the title, characters from the Black family like Sirius Black or Bellatrix Lestrange could be important. And of course, Rumpelstiltskin would be a central figure as well. He would be the one causing all the trouble related to the inheritance.
Another plotline could involve Harry's inheritance being tied to an ancient wizarding family other than the Potters. This could cause a stir in the wizarding community as he has to navigate the politics and secrets of this new family connection while still dealing with his regular challenges at Hogwarts and against Voldemort's remaining followers.
One interesting plotline could be a character discovering they have Veela inheritance and struggling to control their newfound powers. For example, they might accidentally charm people without meaning to.
Well, a possible plotline is the discovery of the succubus inheritance. Maybe the main character doesn't know about it at first and starts experiencing strange things like enhanced allure or different reactions from magical creatures. This could lead to a journey of self - discovery as they try to figure out what's going on. And perhaps there are dark forces that are interested in this inheritance for their own evil purposes, creating a conflict where the character has to protect themselves and their newfound powers.
One interesting plotline could be a hidden magical ability that Harry discovers which was passed down through a very ancient and forgotten line of his family. This new power could give him an edge in fighting against Voldemort in a completely unexpected way.
One interesting plotline could be the exploration of dark magic's origin within the wizarding families. Maybe a character discovers an ancient family heirloom that is tied to dark inheritance and has to face the consequences of that discovery.
One interesting plotline could be a discovery that Harry has a long - lost royal bloodline. Maybe he is related to an ancient wizarding royal family. This could lead to him having special powers or a new status in the wizarding world that challenges the existing power structures.
In some fanfictions, an elf inheritance could involve a change in the social hierarchy. If an elf inherits a great deal of magical knowledge or power, they might start to demand more rights and equality among the wizards. This could create a lot of tension and conflict as wizards are forced to re - evaluate their views on elves.
One interesting plotline could be the main character inheriting kitsune powers and how it affects their relationships at Hogwarts. Maybe they have to hide their new abilities from their friends at first.