One of the main themes is self - discovery. Harry finding out he is Lord Gryffindor is a huge part of his character development. Another theme is power and responsibility. With his new identity, he has more power and thus more responsibility in the wizarding world.
Well, in these fanfictions, a common theme is heritage. Harry exploring his connection to Gryffindor as his ancestor is really important. Also, the theme of loyalty often comes up. His friends' loyalty to him and his loyalty to the ideals of Gryffindor play a big role. For instance, in some stories, his friends stand by him even when the whole wizarding world is against him because of his new status. And of course, the battle between good and evil is always there. Harry, as Lord Gryffindor, has to fight against the dark forces more directly.
Power is a major theme. Harry being Lord Hogwarts gives him a new level of power, and often these fanfictions explore how he uses or misuses it. Another theme is identity. He has to figure out who he is now with this new title. For example, in some fanfictions, he struggles to balance his old self with this new, more powerful identity.
Power is a major theme. Pureblood lords often strive for more power in the wizarding society, whether it's political or magical power.
Because Harry represents the Gryffindor values. He is brave, just like a true Gryffindor. So, in fanfictions, the Gryffindors see him as one of their own and naturally support him.
Power and responsibility. Since Harry is a pureblood lord, he often has to deal with the power that comes with his new status and the responsibility to use it well. Another common theme is identity. He has to figure out how this new identity fits into his existing self.
The sword is often a symbol of his rightful inheritance. It shows that he has a special connection to Gryffindor's legacy.
Well, 'Ginny, the True Heir of Gryffindor' is also a great one. It focuses on Ginny's discovery of her heritage as the heir. It's interesting to see how she uses the powers associated with it. The relationship between her and Harry is portrayed in a very sweet and loving way, and the story also has some cool sub - plots involving their friends at Hogwarts.
One great 'alpha of gryffindor' Harry Potter fanfiction is 'The Alpha's Path'. It shows how the Gryffindor characters display alpha - like qualities in the face of dark magic. Another is 'Gryffindor's Alpha Legacy' which delves into how the Gryffindor house has an unspoken alpha hierarchy and how it affects the students during the events of the books.
There's also 'Gryffindor's United Front for Harry'. It focuses on how the Gryffindor students, from the first - years to the seventh - years, come together to support Harry in his fight against Voldemort. They use their unique skills and Gryffindor - like courage to assist Harry in various ways, like in battles and also in finding clues to defeat the enemy.
Power is a common theme. Since the idea of a vampire lord implies great power, fanfictions often explore how Harry (or the main character) deals with this new - found power. It could be about controlling it, using it for good or being tempted by it.
One common theme is power dynamics. With them being Lord and Lady, there's often exploration of how they handle power within the wizarding world. For example, they might use their new positions to bring about change in Hogwarts or the Ministry of Magic.