This is for Amy, from a Slytherin ! Just to send love to you badgers you're awesome and your house is too ! That may not be much of a Slytherin-ish thing to do but you know... To hell with the stereotypes. I wish we were given more fleshed-out characters per house in the books and not just in mention on Pottermore (like Quirrel being Ravenclaw or Tonks being Hufflepuff). The only characters defeating house stereotypes while in school I think of are Malfoy and Luna. And Cho. Others in mind ?
Neville defeats the stereotype that all Gryffindors are brash and headstrong.
Cedric defeats the stereotype that Hufflepuffs are duffers.
Luna defeats the stereotype that Ravenclaws are stuck up and focused on book-smarts.
Regulus defeats the stereotype that Slytherins put self preservation above all others.
But absolutely. I wish Harry had more friends in the other houses that could show us more about them without resorting to stereotypes.