Nagini

Nagini is a fictional animal from the Harry Potter series. It is a giant snake with an estimated length of at least 12 feet and a loyal pet of Voldemort's, who as a parseltongue is quite capable of communicating with it.

Nagini seems the "evil" equivalent to Albus Dumbledore's phoenix Fawkes.

During the fourth year Harry spends at Hogwarts, Voldemort's temporary body was sustained by Nagini's milk milked by Pettigrew. After Voldemort returned to his former glory, the snake remained in his servitude, being both well-treated and well-used.

In the fifth book, Harry sees Nagini attacking Arthur Weasley in one of his dreams.

Nagini is the female name for cobra in Hindi and most other indian languages. The gender neutral version of the name is Nagam.