I mentioned a while ago that I had sorted Stiles as a Hufflepuff and Derek as a Slytherin, a few people asked for my explanation of the matter so here’s my reasoning, I’m looking at all angles here, including the bad qualities of the houses - so keep your mind open, you’re welcomed to not agree. (FYI, all quotes are either from Pottermore or Wiki’s).
I tried to keep it short but failed sooooo under the cut.

