Each One Direction member, and their Hogwarts' house.
Disclaimer: this is all based on my opinions, I'm not saying this is the way it is but I definitely see each of them on this houses.
Enjoy.

Louis, Zayn.
Slytherins tend to be ambitious, shrewd, cunning, strong leaders, and achievement-oriented. Have highly developed senses of self-preservation. Slytherins tend to hesitate before acting, so as to weigh all possible outcomes before deciding exactly what should be done.

Niall.
The Gryffindor house emphasises the traits of courage as well as "daring, nerve, and chivalry," and thus its members are generally regarded as brave, though sometimes to the point of recklessness.

Liam.
Ravenclaws possess the traits of cleverness, wisdom, wit, intellectual ability and creativity. Students in Ravenclaw are noted for their individuality and acceptance of people and things that others would consider weird, as well as their outstanding intelligence.

Harry.
Hufflepuffs will stand up to what is right and fair at any cost. They believe in always doing the right thing, even if it costs them everything.
Personally, I can't find a someone more Hufflepuff than Harry Styles.

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