Voldemort had a special relationship with Nagini, as she was his pet and one of his Horcruxes. According to Dumbledore, Voldemort had strong feelings for Nagini that he had not for anyone else; she was the one living thing that he had ever cared about.
Lord Voldemort and Nagini had a special relationship
As a Parselmouth, (i.e. able to talk to snakes) Voldemort could communicate with her, and the pair often sent each other messages, even suggesting a telepathic connection at times.
Nagini is loyal to Voldemort because he can speak with snakes. As a Maledictus, there probably isn't much time after the events in The Crimes of Grindelwald before Nagini falls to her blood curse, becoming a snake forever.
He did not love anyone, and did not care to be loved. He felt nothing for his family, and only wanted his friends in school to rally around him because he wanted to hold power over them. Bellatrix Lestrange was obviously in love with him and worshiped him, but he only cared for her servitude, not her.
In Harry Potter, Nagini is one of Voldemort's closest followers, if not the closest. He turns her into a Horcrux, which attests to how close they are. Dumbledore eventually refers to Voldemort as being as fond of Nagini "as he could be of anything." However, the story of how they met is difficult to piece together.
Nonetheless, despite her initially benevolent nature, Nagini's blood curse eventually turned her into a snake permanently. Though it is unknown if she became evil as a result of that, or was turned evil as a result of Voldemort turning her into a Horcrux. As a snake, Nagini was completely loyal to Lord Voldemort.
Dumbledore does not use any language to make one think that Nagini is anything more than a snake. But this could be despite his knowledge of Nagini's past because he has to factor his grand plans into everything he tells (or doesn't tell) Harry.
Bellatrix Lestrange (née Black) is the first female Death Eater introduced in the books. Aunt of Draco Malfoy and Nymphadora Tonks. She was introduced in Harry Potter and the Order of the Phoenix. She is the most faithful member of Voldemort's inner circle.
She was dieting and didn't want greasy food.
Harry Potter and the Cursed Child dropped a major revelation: Bellatrix and Voldemort have a secret illegitimate daughter together. That means Bellatrix cheated on her husband Rodolphus.
When Harry and Hermione are on the first floor of Bathilda's house, Nagini (inside the corpse of Bathilda) tells Harry to "Come!" from the next room in Parseltongue. In reaction, Hermione jumps and clutches Harry's arm, and the two of them obey the command.
It wasn't just inanimate objects that could become Horcruxes. Lord Voldemort's beloved snake companion, Nagini, was also transformed into one, and Dumbledore seemed to know it, ominously predicting that a day would come where Voldemort would 'fear for his snake'.
Harry is never in a position to 'chat' to start with. She's there in the graveyard but Harry is surrounded by Death Eaters and Voldemort, he can't sneakily talk to her.
Until then, Voldemort required the potion every few hours to keep his crippled body alive, and Pettigrew had to continuously milk Nagini for the venom to keep feeding his master.
The only "emotion" Voldemort felt when Nagini died was fear because she was the second to last piece of his soul. If Nagini wasn't a horcrux, he wouldn't even have kept her around. When Voldemort said “I regret it” after killing Snape, what was he feeling?
There was a rumour that Nagini was the snake Harry released from the zoo in Harry Potter and the Philosopher's Stone. This was proven false, as Nagini is some type of viper while the snake in the zoo was a boa constrictor. Furthermore, the snake was given a male voice in the film, while Nagini is female.
As a result, she is kidnapped by Death Eaters and summarily executed by Voldemort. Nagini, Voldemort's snake, then eats Professor Burbage's dead body.
Quirrell didn't use the Killing Curse on Harry, because Voldemort said “use the boy” to get the Sorcerer's stone from the Mirror of Erised. If Quirrell had killed Harry right away, he would have lost the chance to get the stone.
Voldemort would dodge it. That's the simple answer. There's no way they could hit him with it. Harry did try to use the killing curse in movie 5 against Bellatrix who stated something to the effect he couldn't do it because he really had to mean it, implying it had to be in his soul to want to kill people.
It has been said that the only wizard he ever feared was Albus Dumbledore, former Headmaster of Hogwarts School of Witchcraft and Wizardry, though Voldemort has repeatedly denied it.
Strongest: Bellatrix Lestrange
Everyone's favorite Death Eater was also arguably Voldemort's most talented. Although her dueling skills were of the most impressive of all of her colleagues, her unyielding support of the Dark Lord is what gave her edge. She wasn't afraid to put her life on the line for Voldemort.
Draco's refusal to reveal Harry's identity to Bellatrix was not because he liked him. It was because he believed that Harry was the only chance they had at defeating Voldemort. At first, Draco admired and revered Voldemort until he threatened his family's safety.
But now we know Nagini was no simple supervillainous pet, but a human woman cursed with the “Maledictus” blood curse, which, according to Rowling, is a female-only inherited condition which grants the affected individual the ability to transform into an animal at will, until one day, the transformation becomes ...
J.K. Rowling recently gave more insight into one of the most controversial characters in the Wizarding World: Nagini, who was known only as Voldemort's snake in "Harry Potter," but appears as a woman in the prequel series, "Fantastic Beasts."
He finds out for sure immediately after Nagini's attack on Arthur Weasley. This night is significant in many ways. While Harry sleeps, he enters Nagini's mind.