Which Harry Potter film features the first appearance of the character Nymphadora Tonks?

Harry Potter and the Order of the Phoenix features the first appearance of Nymphadora Tonks.

Tonks is introduced as a young Auror and member of the revived Order of the Phoenix. She helps protect Harry at the beginning of the film and later participates in the battle at the Department of Mysteries.

Natalia Tena played Tonks throughout her film appearances. The character is known for her Metamorphmagus ability, which allows her to change her appearance, and for her energetic personality. The films generally call her Tonks, although she dislikes being addressed by her first name, Nymphadora.

Tonks returns in Harry Potter and the Half-Blood Prince and the two Deathly Hallows films. She becomes connected to Remus Lupin’s storyline, which is developed more fully in the final movies.