"She's so hot. So hot."
Heidi Seren MacAvoy (Mæcǝvɔɪ; born March 21, 1980 in Carmarthen, Wales) was a Chaser on the Hufflepuff Quidditch team when it was captained by Cedric Diggory. She first appeared in The Strange World of Harry Potter, in which Samuel Vanderbilt has a crush on her after a Bludger hits Sam's broom during Quidditch, and goes crazy, hitting MacAvoy in the back of the head and knocking her off her broom. She kisses him in the Hogwarts astronomy tower, and Sam later takes her to the Yule Ball. She makes her second appearance in The Return of Heidi MacAvoy.