One popular fanfiction might be where Harry has an older sister who was hidden away to protect her from Voldemort. In this story, she could have been trained in magic secretly and then return to Hogwarts to help Harry in his fight against the Dark Lord.
There's 'Harry and His Brother' which is a heart - warming fanfic. The brother is younger than Harry and has his own unique magical abilities that are different from Harry's. They go on adventures together around Hogwarts and outside, and it shows their growing relationship.
One interesting storyline could be that his younger siblings are sorted into different houses at Hogwarts. For example, one might be in Hufflepuff while Harry is in Gryffindor. This could lead to some sibling rivalry as well as moments of them coming together to face challenges. Another could be that his younger siblings have unique magical abilities that Harry doesn't possess, and they end up helping him in unexpected ways during his battles against Voldemort.
There could be a fanfiction where the ring is a key to a hidden wizarding library. Harry discovers the ring and has to go on a quest to figure out its purpose and how to use it to access the library full of ancient spells and knowledge.
One fanfiction might depict Harry getting the rune tattoos as a symbol of his newfound power and connection to an ancient magic. The runes could be tied to his destiny, perhaps revealing secrets about his parents or his role in the wizarding world.
In a fanfiction, the Elder Wand in Harry's hands might attract the attention of other powerful wizards from around the world. They come to Hogwarts to challenge Harry for the wand, believing that whoever holds it should be the most powerful wizard alive. Harry then has to defend himself and the wand, not just physically but also by proving that he is worthy of it in a more moral and ethical sense. He might have to engage in magical duels as well as debates about the true purpose of such a powerful object.
One possible fanfiction could be where Harry discovers he has dragon claws during a dangerous encounter in the Forbidden Forest. Maybe he uses them to fight off a dark creature that normal magic couldn't defeat.
One interesting fanfiction could be where Harry discovers a sphinx cub in the Forbidden Forest. The cub bonds with him and becomes his familiar. It helps him solve mysteries around Hogwarts by using its riddle - asking nature.
One possible fanfiction could be where Harry discovers he has a Muggle lordship through some long - lost family connection. In this story, he might struggle to balance his wizarding world duties with his newfound Muggle responsibilities, like managing estates or dealing with Muggle social hierarchies. It could also lead to some interesting interactions between the wizarding and Muggle worlds as he tries to keep his two lives separate yet intertwined.
One possible fanfiction could be about Harry growing a beard during a long journey in hiding. He might use the beard as a disguise to evade his enemies. The story could explore how his friends react to this new look of his.
One interesting fanfiction could be where Harry's magic eyes allow him to see hidden spells and curses that others can't. This gives him an edge in battles and helps him protect his friends. For example, he might be able to spot a Death Eater's hidden dark magic charm before it's too late.