A Friend in All Four

Circinus Black. A Hufflepuff.
Harry Potter. A Slytherin.
Luna Lovegood. A Ravenclaw.
Neville Longbottom. A Gryffindor.

When has there ever been a person in each of the four Hogwarts Houses who all got along? Since the Founders, Never. The Slytherins and Gryffindors have been too busy at each others throats to think about becoming friends, while the Hufflepuffs and Ravenclaws are too busy trying to diffuse the tension when they can. So, of course, these four children are outcasting themselves from other students, but what wouldn't you do for you friends, or in this case family?