One possible plot could be that Harry Potter is somehow magically transformed into Sebastian Snake. He then has to navigate the wizarding world from a completely different perspective. He might face challenges as a snake, like being hunted by other magical creatures or not being able to communicate in the same way as a human. And he has to find a way to reverse the transformation while also uncovering a mystery related to how it happened in the first place.
I'm not sure specifically about a 'Harry Potter is Sebastian Snake' fanfiction. There are countless fanfictions in the Harry Potter fandom, and it might be a rather niche or new concept. It could potentially involve a really creative re - imagining of Harry Potter's character in relation to this 'Sebastian Snake' in some unique plotline.
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.
One great fanfiction could be 'The Summoning of Sebastian by Harry Potter'. In this story, Harry might summon Sebastian for a special mission. Maybe it's to solve a mystery in Hogwarts that only Sebastian's unique skills can help with. It could involve a lot of magical elements like complex spells and ancient artifacts.
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.
Yes, there are some out there. You can start by looking on fanfiction websites like Archive of Our Own or FanFiction.net. Just search for 'Harry Potter is Sebastian Snape' and you'll likely find a variety of stories with different takes on this unique concept.