In addition to the obvious ones, there could be some minor characters from the wizarding world who play important roles in this fanfic. The goblins from Gringotts might be involved as they have a lot of knowledge about wizarding families' heritage and wealth. They could be the ones conducting the test or providing some key information. There could also be other students at Hogwarts who are either jealous or intrigued by Harry taking this heritage test. Some pure - blood families might also be interested in the results, either because they want to see if Harry is a 'true' wizard or because they are worried about how his heritage might change the power dynamics in the wizarding world.
Dumbledore could be involved too. He often has a deeper understanding of things in the wizarding world. He might be the one who arranges the heritage test for Harry, or at least be aware of it and offer his wisdom and guidance. Also, some of Harry's professors could be involved. For example, Professor McGonagall might be curious about the results and how it could affect Harry's performance in school. And, there could be some characters from Harry's family's past that make an appearance, either as memories or some sort of spectral form during the test.
The teachers, such as Professor McGonagall or Professor Snape, would most likely be involved. McGonagall could be the one administering the test, while Snape might be observing with his usual critical eye. Also, other students in his year could be taking the test alongside Harry. They could be either competing with him or collaborating in some parts of the test. This would add an element of drama and friendship or rivalry to the fanfic.
Dumbledore could play a crucial role. As the wise headmaster, he may have some prior knowledge about Harry's possible inheritances. He could guide Harry through the process, explaining the significance of any new powers or items he has inherited and how to use them for the greater good of the wizarding world.
Hermione would probably be there. She might be helping Harry prepare for the test, giving him tips on how to answer different types of magical questions. Another could be Ron, providing moral support and some comic relief during the tense time of the test.
In the 'Harry Potter takes a heritage test fanfic', it's possible that the heritage test is not as straightforward as Harry expects. There could be elements of the test that are designed to mislead or trick him. The results of the test might not only be about his blood heritage but also about his moral and ethical heritage within the wizarding community. For instance, it could show that his family has a long - standing tradition of helping outcasts in the wizarding world, which gives Harry a new sense of purpose. It could also be that the test is part of a larger plot by some dark forces to manipulate Harry, and he has to figure out the true meaning of the test results to avoid being used.
Obviously, Harry would be one of the main characters.
Hermione could be with him. She would probably be there to offer moral support and maybe even use her vast knowledge to understand the blood test better.
Snape could also be part of it. He might catch Harry in a rather awkward moment when he's trying to hold it in and give him a hard time. Or, on the other hand, he could surprisingly offer some help in a very Snape - like way.
Hermione could be there. She's always around to support Harry and might be observing the ability test.
Perhaps Harry finds out that his heritage is linked to a powerful and ancient magical line that he was previously unaware of. This could open up new storylines such as him having to learn special spells or abilities associated with that heritage. It might also cause some envy or suspicion among his peers at Hogwarts.
If Harry Potter takes a heritage test in fanfiction, it could be a very interesting development. Firstly, the test could show that he has a more complex bloodline than he initially thought. It might uncover that there are elements of his heritage from other magical cultures, not just the British wizarding world. This could open up new storylines where he has to deal with different magical traditions and powers related to his newly - discovered heritage. Secondly, it could also shed light on the reasons behind some of the strange things that have happened to him throughout his life, as they could be related to his hidden heritage. And finally, it could lead to him forming new alliances or facing new enemies based on what the heritage test reveals.