Perhaps in the fanfiction world, there is a special bond between Hermione and snakes that is different from the original story. The snake might be a symbol of a new power or ability that Hermione discovers, and it chooses to stay with her as a pet.
It could be that Hermione found the snake during one of her adventures in the Forbidden Forest. The snake might have been injured, and she decided to take it in and nurse it back to health, and then it became her pet.
In some fanfictions, the snake could be a magical gift from a mysterious wizard. Maybe it was given to Hermione because she showed great potential in handling magical creatures.
The snake might help Harry in his search for Horcruxes. It could use its unique senses to detect the presence of dark magic associated with the Horcruxes. For instance, it could lead Harry to a hidden location where a Horcrux is concealed.
Having a pet snake could enhance her knowledge of magical creatures. She would have to study more about snakes, their behaviors, and needs. This would further expand her already vast knowledge base and make her more respected in the field of magical creature studies. For example, she might learn unique spells to communicate with the snake, which would be a new aspect of her magical abilities.
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'.
In some fanfictions, the snake necklace could be a symbol of Draco's Slytherin heritage. It might be used to show his connection to the darker, more mysterious side of the wizarding world. Hermione's interaction with it could represent her delving into that part of Draco's world, perhaps as a way to understand him better or to bridge the gap between Gryffindor and Slytherin. For example, if Draco gives Hermione the snake necklace in a fanfic, it could be a sign of his trust or a new level of their relationship.
We can conclude that snake pets refer to the activity of raising snakes as pets. Snake pets could include breeding all kinds of snakes, such as corn snakes, king snakes, and so on. The corn snake was more common among pet snakes. It had a gentle temperament and was easy to raise. It was suitable for novices to raise snakes. The king snake was also a common pet snake. It had low feeding requirements and was easy to take care of. It was also suitable for novices to raise snakes. As a pet, raising a snake could give people a different experience, but at the same time, one had to pay attention to the temperature, humidity, parasites, and other issues of the environment. In general, snake pets were a special pet breeding activity that was suitable for people who were interested in snakes.
Well, it could be that Harry's snake has some magical powers. Maybe it can communicate with other magical creatures secretly. It could help Harry in his adventures, like finding hidden passages or warning him about danger.
Some fanfictions might use the snake necklace as a sign of danger or a connection to the Dark Arts. Draco could be in possession of it, and Hermione, being the brave and intelligent witch she is, tries to understand its power in order to protect Hogwarts or even Draco himself from the possible negative influences associated with the necklace.
In this fanfiction, Harry might find the snake in the Forbidden Forest. The snake could be a magical one with special powers, like being able to communicate telepathically with Harry. It could help Harry in his adventures, for example, by warning him of danger in the school corridors.
The snake could help Harry find his way around Hogwarts. You know, Hogwarts is a huge and complex place. The snake might be able to sense the different magical auras of different areas and lead Harry to where he needs to go, like the library when he has to study for an important exam or the Room of Requirement when he's in a tight spot.
In some fanfictions, the snake familiar could be from a hidden part of the Forbidden Forest. There might be a special nest of magical snakes, and Harry discovers this one snake that has a unique connection with him.