A new student who discovers they have a strange connection to the blood of all four houses. They might be an orphan, not knowing their true heritage until they start at Hogwarts and strange things start to happen. Their powers start to show and it becomes clear they are different from the other students because of their four - house blood.
It could be a long - lost relative of the founders. Maybe a distant cousin of Gryffindor, Ravenclaw, Hufflepuff and Slytherin. This person might have been hidden away for years and now resurfaces.
It could be a long - lost descendant of the founders of all the houses. Maybe a distant relative of Godric Gryffindor, Salazar Slytherin, Rowena Ravenclaw, and Helga Hufflepuff. This character would be in a unique position as they have the blood of all the great wizards and witches who founded Hogwarts.
The plot could involve a mystery surrounding this person with the blood of the four houses. They could be hunted by dark forces who want to use their special blood for evil purposes. At the same time, they are trying to uncover secrets about their heritage within the four houses.
Well, in a 'Harry Potter Blood of All the Houses' fanfic, the plot might revolve around a new student at Hogwarts who is an orphan. As they get sorted, the Sorting Hat has a hard time placing them because it senses the blood of all the houses in them. This student then becomes a sort of bridge between the different houses. They might use their knowledge of the different house traits to bring the students together during a time when the school is divided, like during a Quidditch tournament where there is a lot of inter - house rivalry.
Maybe it's a well - known character like Hermione. Given her intelligence and leadership skills, she could be thrust into a situation where she becomes the lord of many houses. She would then use her knowledge of magic and her ability to make friends across different groups to manage the houses effectively.
It could be a new student at Hogwarts. A young wizard or witch who has just discovered the magical world and also has a deep love for Shibas. They might be the one going through the strange blood test and their Shiba - loving nature could be what sets them apart in the story.
It could be a new character, like an assassin from a far - off land who comes to Hogwarts under false pretenses. They have their own set of skills and motives that are different from the regular characters in the Harry Potter series.
It could be a young witch who is just starting to explore her magical abilities outside of Hogwarts. She takes on a babysitting job to earn some extra money and ends up having all sorts of magical adventures with the kids she babysits.
A Muggle - born wizard could be the main character. They are used to the Muggle concept of hairdressing but also want to incorporate their new - found magic into it. This character would be constantly trying to bridge the gap between the two worlds in their salon, creating a unique blend of Muggle and wizarding hairdressing styles.
Obviously, Harry Potter himself could be the main character. Given his adventurous nature, he would be a great fit to incorporate parkour into his already impressive list of skills. He could use parkour to explore new areas of Hogwarts or to escape from dangerous situations.
Perhaps Accelerator from the railgun universe could be the main character. He has his own set of abilities that would be very interesting to transplant into the Harry Potter world. He might initially be seen as a threat due to his powers but then end up using them to fight against a common enemy, like a new dark wizard or a powerful magical creature that has gone rogue.