2. Hufflepuff, founder: helga hufflepuff.

Ravenclaw College, founder: rowena ravenclaw.

4. Slytherin, founder: Godric Gryffindor salazar slytherin.

Extended data:

In the four schools of Hogwarts School of Wizardry, Gryffindor stands for fire, Ravenclaw stands for wind, Hufflepuff stands for earth and Slytherin stands for water. When the four elements coexist, a complete system is formed. But they are also independent.

The first thing for freshmen at Hogwarts School of Witchcraft and Wizardry is to put on sorting hat. Sorting hat will judge what kind of freshmen should belong to according to their personality and quality.