Another unique aspect is the exploration of his identity. Harry has to grapple with being part - human and part - snake. This can lead to internal conflicts. He may question his place in the wizarding world, whether he belongs more with the 'normal' wizards or if his snake side makes him something different altogether. It's a really fascinating exploration of a character we thought we knew well from the original books.
One popular 'Harry Potter half snake fanfiction' is 'The Serpent's Heir'. It explores the idea of Harry having a connection to snakes in a really interesting way. The story delves into how this affects his magic and his relationships within the wizarding world.
There could be many interesting fanfictions involving Harry Potter and a snake. Maybe the snake is a magical creature with special powers that helps Harry in his adventures. For example, it could lead him to hidden secrets or protect him from dark wizards.
It could also be a snake from the Forbidden Forest. There are many unknown and mysterious creatures in there. A snake from that forest might be more in tune with the natural magic of Hogwarts. Harry, being the curious and kind - hearted person he is, might come across it during one of his adventures in the forest and start a friendship with it.
It could be Nagini. Even though in the original series she was more of a servant to Voldemort, in the fanfiction, she could have a different personality and form a bond with Harry.
Maybe it's an anonymous gift from someone who has been observing Harry. This person could be a former student of Hogwarts who has a special connection to snakes and sees that Harry has a kind heart and would take good care of the snake. So they leave the snake for Harry to find with a simple note that just says 'For Harry Potter'.
The snake's help could represent an unexpected alliance. In the Harry Potter series, snakes are often seen as symbols of Slytherin, which is usually at odds with Harry. So it's significant as it breaks the stereotype of enmity between Gryffindor (represented by Harry) and Slytherin.
The snake might use its ability to move stealthily. It could spy on the enemies for Harry Potter. For example, it can slither into hidden places where humans can't easily reach and gather important information.
Snake magic in Harry Potter fanfiction can be used to show a character's dark side. Since snakes are often associated with Slytherin and dark magic in the original series, in fanfiction, a character using snake magic might be on a path towards the dark arts. For example, they could use snake magic to control others or gain power in a more underhanded way.
I'm not entirely sure if there is a specific 'Harry Potter is half demon' fanfiction, but considering the limitless creativity in the fanfiction community, it's very likely. Writers might be inspired to create such a story to explore the contrast between the magical world of Harry Potter and the more dark and otherworldly concept of being half - demon. They could use it to examine themes like acceptance, identity, and power in a whole new light.