Heather might also be a bit of a rebel. In the strict world of Hogwarts and the wizarding community, she could break the rules to help Harry. For instance, she might smuggle in some special magical items that are not allowed in the school but are crucial for Harry to face certain challenges.
She could be a protector. Given that she's the older sister, she might feel responsible for Harry's safety. This could lead to her getting involved in battles or using her magic to shield Harry from harm.
There could be various storylines involving Heather as an older sister in Harry Potter fanfiction. Maybe she's a Gryffindor like Harry and helps him out in his adventures, or she could be a Slytherin with her own complex motives.
She could play a protective role towards Harry. Since she's older, she might feel a strong sense of responsibility for her younger brother. For instance, she could be the one who first discovers some of the secrets about Voldemort's return and warns Harry.
The MC (main character) can be a new student at Hogwarts. They could be sorted into one of the houses and experience all the magical adventures like learning spells, exploring the Forbidden Forest, and making friends with the well - known characters in the Harry Potter world.
A druid can play the role of a mentor. They can teach the main characters about a different kind of magic, one that is more in tune with nature. For example, they could show Harry Potter how to use natural elements like plants and water in a more effective way for magic.
The older sister could act as a mentor. Since she's older, she might have more experience at Hogwarts and could guide Hermione through the social and academic aspects. For example, she could tell Hermione which professors are more lenient and which ones to be extra careful with.
It can be a plot device. For instance, it could be the reason behind some unexplained disappearances in the wizarding world. If a character has been marked by the Grim Reaper in the fanfiction, it could lead to a series of events where they try to escape their fate.
One role could be as a clue. In a fanfic that combines the two universes, an azalea might be the key to solving a mystery. Maybe it has a hidden message written on its petals in a language only a few can understand. In the Harry Potter side, it could be related to ancient runes, and in Supernatural, it could be a sign from an angel or demon.
A 'little bat' can play the role of a messenger. In the Harry Potter world, owls are the common messengers, but a little bat could be a more secretive option. It could carry small, important notes between characters who don't want their communications to be easily noticed.
They could be the hero. In some fanfictions, a half - giant might rise up against the forces of evil. Their physical strength gives them an advantage in battles. They can break through barriers and fight off dark wizards. Also, their connection to the giant world might bring in some unique elements to the story, like a magic that only half - giants know.
It could play the role of a catalyst for change. For example, its discovery in the wizarding world could start a new era of magic study. The Sky Arcobaleno might inspire new spells or magical techniques.