Her family (the Lovegoods) was mentioned in Book 4 - HP and the Goblet of Fire. However, she first appeared in Book 5 - Order of the Phoenix and she also appeared in books 6 & 7.
She enters in the 5th book. Her first appearance is on the Hogwarts Express, Harry sits in the same compartment with her, Neville and Ginny. She's portrayed as being a highly unusual witch, with...
Luna Lovegood appeared in three of the Harry Potter books. Harry Potter and the Order of the PhoenixHarry Potter and the Half-Blood PrinceHarry Potter and the Deathly Hallows
Rolf Scamander. Grandson of Newt Scamander ex Headmaster at Hogwarts and a Magizoologist (Study of magical creatures). Also the author of 'Fantastic Beasts And Where To Find Them'. Rolf, keeping...