What could be the significance of the snake in the lake in Harry Potter fanfiction?

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.

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.

A succubus with a snake - like tongue in a Harry Potter fanfic might be a new and unique creation by the author. It could be part of a plot where she uses her appearance, including the snake - like tongue, to infiltrate the wizarding world. Maybe she's a spy for a dark force, and the tongue is a way for her to identify others who might be sympathetic to her cause. Or perhaps it's just a cool and spooky feature that the author added to make the character more memorable and add a touch of mystery to the fanfic.

One possible plot could be that the snake is a key to unlocking an ancient prophecy. Harry discovers the snake and realizes it has markings that match an old legend. He then has to protect the snake from Voldemort who wants to use it for his own evil purposes.

One possible plot could be that the snake is a magical guardian of Hufflepuff house. It's been hidden away for years, but due to some dark magic threat emerging in Hogwarts, it awakens. The Hufflepuff students then have to figure out how to work with the snake to protect their house and the whole school.

One possible plot could be that Harry discovers a magical bond with a snake that is different from Parseltongue. The snake might have unique powers that help Harry in his battles against Voldemort. For example, the snake could sense dark magic from afar and warn Harry. Their relationship could be one of mutual protection and growth.

Well, it could be that the snake is a magical snake that was being hunted by some dark wizards. Harry takes it in out of kindness. The snake then forms a bond with Harry and becomes like his secret helper. For example, it could slither into places Harry can't go and gather information for him.

The snake could be an injured or lost magical creature. Harry, being the kind - hearted person he is, decides to take care of it. As he does, he realizes that the snake has a connection to a powerful wizard or witch who has been lost for ages. This connection then draws Harry into an adventure to find out what really happened to that powerful figure and how it affects the present state of the wizarding world.

A snake could use its venom to attack enemies who try to harm Harry.