2. The bloody baron of Slytherin;

3. Hufflepuff's fat monk;

4. Ms. Gray of Ravenclaw.

Hogwarts School of Witchcraft and Wizardry is one of the three major schools of Wizardry in Europe. The school adopts a seven-year academic system, and all students board at Hogwarts. During Christmas, students can leave school and go home, or they can choose to stay at school for the holidays; After the third grade, with the signature of the guardian, you can go to Hogsmeade village on weekends. All students must leave school during the summer vacation.

Hogwarts is divided into four colleges, namely Gryffindor, Hufflepuff, Ravenclaw and Slytherin. The first thing in freshman year is to wear sorting hat. sorting hat will judge which college you belong to according to your personality. Each of the four colleges has its representative colors and animals, and the school emblem has the representative animals of the four colleges. Every college has a ghost living in it.