Helga G. Pataki is the tritagonist, as well as the overall main antagonist and bully-protagonist, but sometimes an anti-hero in the Nickelodeon animated television series Hey Arnold!. She was also serves as the deuteragonist of the 2017 TV film Hey Arnold!: The Jungle Movie. She is only pretends to hate Arnold, but normally loves him. She is Arnold's arch-rival yet love interest, later girlfriend.
She is voiced by Francesca Marie Smith in series and movies.