Slytherin student and classmate of Harry Potter and his friends. She is one of The Original Forty.
From the Story
"Millicent Bulstrode is a first-year Slytherin."
Discovered in Book 2, Chapter 11, The Diversion
"Millicent Bulstrode is a large, square Slytherin second-year. Hermione is paired with Millicent in the Duelling Club and at one point she gets Hermione in a headlock."