Nagini's human form could potentially disrupt Tom Riddle's plans. Since she has human emotions in this form, she might not be as blindly obedient as she is in her snake form. For instance, she could show mercy when Riddle wants her to attack someone, which would be a hindrance to his dark plans.
One possible plot could be Nagini's struggle between her loyalty to Tom Riddle and her own humanity. Maybe she starts to question Riddle's dark deeds as she still has human emotions. For example, she might try to prevent him from harming an innocent person.
The Nagini in the Harry Potter series was a large snake. In the story, it was one of Voldemort's Horcruxes. Nagini was under Voldemort's control and was used to do his bidding, often being a weapon in his attacks. It was also used to spy on others as snakes in the wizarding world can be used for that purpose.
Nagini was originally a human woman named Bertha Jorkins. She was cursed and transformed into a snake by Voldemort. Nagini became one of Voldemort's Horcruxes.
It could start with hostility. Harry sees Nagini as a tool of Voldemort, and Nagini is loyal to Voldemort at first. But then, some unexpected events might force them to interact more. For example, they could be trapped together in a magical place, and they have to rely on each other to get out.
Nagini was once a human woman. She was a Maledictus, a person cursed from birth. Over time, due to the curse, she gradually transformed into a snake. Eventually, she became one of Voldemort's Horcruxes. This transformation was a long and tragic process, as she lost her humanity bit by bit as the curse took hold.
Well, Nagini has a rather tragic back story. As a Maledictus, she was doomed from the start. Her transformation into a snake was a slow and painful process. In the wizarding world, being a Maledictus set her apart. And when Voldemort came into the picture, he exploited her situation. He saw the potential in her as a Horcrux. Nagini, in her snake form, was then used by Voldemort to do his bidding, whether it was spying or attacking his enemies. She was a key part of his evil plans.
The characters included the male lead, Robbin Lestrange, a rising star in the magic world, and the female lead, Hermione Granger, and Little Chili Pepper.
Hogwarts: The Capture of Nagini at the Beginning by Little Persimmons. It was a fantasy/mystery fantasy novel with transmigration elements.
[User recommendation: Luo Bin transmigrated to the Western Magic World and obtained the golden finger-Magical Animal Cultivation Rubik's Cube!]
As long as they defeated the magical creatures, they could be kept in the Rubik's Cube. They could also be fed and nurtured to increase their magical attributes and combat strength.
Nagini's poison was too weak, and it could only make the wound bleed?
Garden Gnomes are too useless, they only know how to dig holes and gnaw on roots?
The Black Lake Merfolk were ugly and could only lure people to drown with their singing?
The Whomping Willow's roots were deep underground, and it was only suitable for close combat?
The hungarian Horntail Fire Dragon had a huge body and limited vision.
......
When the second-generation Dark Lord led his men to attack, he was shocked to find that Hogwarts had become the headquarters of the Magical Beasts.
Then, he and his subordinates were beaten up by the mutated creature until they could not even find their way north!
I hope you will like this book.
Yes, there are some out there. You can try searching on fanfiction - specific websites like Archive of Our Own. Just be aware that the concept is quite unusual as Nagini is a snake and in the original series, not really a typical love interest for Harry.