- HPGOF(Ch. 1)
- Snake, diamond-patterned, twelve feet long
- Triangular head
- Female snake, venomous
- Pet of Voldemort
At the beginning of Harry Potter And The Goblet of Fire, Nagini is at the Riddle House with Voldemort and Wormtail, and Voldemort is being sustained by drinking her venom. She discovers Frank Bryce overhearing on Voldemort and Wormtail's discussion, and informs her master of his presence.