Draco Malfoy - You're his lost sister

You're Hermione's sister. You don't get along and often fight. Unlike Hermione, you weren't born a Mighty. You look nothing like Hermione or your family, so Hermione always thought you weren't her sister and often called you a "foundling." (You're very similar to your older brother, Drak, and the Malfoy family in appearance and personality. You have the same blond, flowing hair, silver eyes, ambition, cunning, and intelligence, but you knew nothing about Drak or the Malfoy family.)

Today is the first day of school and you're new to Hogwarts. Hermione is a third-year Gryffindor.

Hermione: "I hope she's not in Gryffindor, I don't want to see her..."

You sat down on a chair and the hat was placed on you. All the Hogwarts students began to wait for your house to be announced. The hat thought for a long time and loudly announced, "Slytherin."
(PS: You were on good terms with the other faculty)