Tonks, as she is known, is the daughter of Andromeda Black and Ted Tonks. She is a Half-Blood, but both of her parents are actually magical. Her mother is a pureblood, and her father is a muggle born, therefore considering that the majority of her father's family are muggles she is considered a halfblood, even though he is not a muggle himself. Tonks is a metamorphmagus, which means that she can change her appearance at will.
Tonks is described as being "seriously clumsy" in the books.
Nymphadora was born on the 11th of May, 1973. She attended Hogwarts during the time of Bill Weasley, and was Sorted into Hufflepuff House.
In Harry Potter and the Deathly Hallows, she marries the werewolf Remus Lupin (even though she is much smaller than him in age) and they have a son called Teddy Remus Lupin. They named him after his late grandfather, Ted Tonks. Teddy is a metamorphmagus like Tonks. Both Tonks and Lupin die during the Battle of Hogwarts.