On my own, I'm not that big a fan of HP, but I can fandrool with others.
I never took the Pottermore test. I just declared myself a Slytherin because I know I am.
I used to think I was a Ravenclaw, but honestly, I don't usually seek knowledge for the sake of knowledge; rather, there is always a reason I want to know, because I Have Something I Want To Do, even if it's as simple as writing a short story or researching a topic so I can write software to automate a process. Call all that ambition of you want. I call it Getting Things Dome and Optimizing How Things Get Done.
Similarly, I do value friendship, which is a thing often overlooked - but I'm not above calling ANYONE'S bullshit, no matter how close I am to them; I can be VERY loyal, but betray me or break my trust and I neither forgive not forget; accept me, be honest and don't bullshit me, and don't judge me, and we'll probably be friends forever.
In that vein, I can be brave too - I just usually pick my fights very carefully, and if there is a simple, quiet solution that will get it done better than me whipping my wand out in people's faces while yelling, like informing the collect authorities, or taking the parties aside and talking to them separately, then I will do that.
Lastly, I don't seek power over others for the same of it. I think the view of Slytherin presented in the books is reductionist. Nothing makes me wince and cringe so much as that scene where Slytherin House is basically judged as a whole during the War of Hogwarts, as basically locked in the dungeon, even though it's largely the crimes of the previous generations, and the actions of a vocal few, like Malfoy, who are giving them a bad name. I mean, if I had been in Harry Potter then...I don't know if I WOULD have said something. I was an insecure teenager. It takes a deal of courage to stand up to your enemies when all your friends are doing it and the world applauds you - it takes a deal more to do it when you're scared yourself and you're afraid your friends or your House will murder you for doing what's right.
Sometimes bravery comes only later on in life.
Honestly, I feel like the definitions for the houses are a bit simplistic. Taken with JKR's spin, they already sound like one house is Good, one house is Evil, one house is Judgemental, and the other house is Full of Fools.
Let's just say that there are a lot of things about HP that annoy me because they make no sense.
So I should clarify: a lot of the Harry Potter stuff I say is actually me rewriting my own headcanon to actually delve into the implications of these definitions, as really think about both the dark sides, the light sides, and the gray sides of these profiles, because I Disagree.
In addition, I tend to skew towards the Harry Potter and the Methods of Rationality view of things, as opposed to strict canon, because HPMOR actually makes sense. (If you haven't read it, go read it! The fic is complete now, and it's SO EPIC!
HPMOR)
I actually have my own Twitter hashtag called
#Murderwarts (click on Latest and start reading from the bottom), where Gryffindor murders someone with a shovel, and I tweet a bunch of random shit exploring the dark, altruistic, rational, and irrational behaviors of each House.
Maxwell really is a Hufflepuff though. Looks like a cinnamon roll. Really is a cinnamon roll.