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Are the the Common Room passwords decided by Prefects or by House Masters or some other way?

The only mentioned password of Slytherin common room is Pure Blood. Is this password set by the Slytherin's prefects or by Severus Snape himself? (Are there no muggle-borns in Slytherin?)

Update: I also initially thought that the passwords were set by the guardians of the common rooms (Incident between Sir Cadogan and Neville is an example, but we can't conform it because Sir Cadogan came as a temporary replacement to Fat Lady and the security levels are not that good. So Dumbledore might have insisted him to give Password.) but the password of Dumbledore office is typical. It's password is his favourite muggle candy, which must be his own choice rather than that of stone staircase.

  • The question of whether there are muggle-borns in Slytherin is distinct from the issue of portrait passwords; see this other question for the answer. – alexwlchan Aug 8 '15 at 17:23
  • @alexwlchan Thanks! It's not fully out of issue, if there are Muggle born in Slytherin, then their own group common room password is Insulting them, it indirectly means that Mud-bloods have no place in Slytherin. – axelonet Aug 8 '15 at 17:33
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    It must be? Why? – phantom42 Aug 8 '15 at 20:50
  • @phantom42 A stone staircase definitely doesn't have any idea of a muggle candy. – axelonet Aug 9 '15 at 2:14
  • @AdityaBlaze not necessarily. If a room can know what a random person outside it wants, why can't a staircase know what its master likes? – muru Aug 9 '15 at 4:59
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I think the passwords are set by the common room guardians.

When Sir Cadogan is guarding Gryffindor Tower, we’re told:

The Fat Lady’s ripped canvas had been taken off the wall and replaced with the portrait of Sir Cadogan and his fat gray pony. Nobody was very happy about this. Sir Cadogan spent half his time challenging people to duels, and the rest thinking up ridiculously complicated passwords, which he changed at least twice a day.

Prisoner of Azkaban, chapter 9 (Grim Defeat)

If the passwords were being set by an external authority (say, the headmaster or head of house), it’s unlikely he’d be able to get away with such an aggressive policy.

The Ravenclaw guardian doesn’t even use passwords:

Luna reached out a pale hand, which looked eerie floating in midair, unconnected to arm or body. She knocked once, and in the silence it sounded to Harry like a cannon blast. At once the beak of the eagle opened, but instead of a bird’s call, a soft, musical voice said, “Which came first, the phoenix or the flame?”

“Hmm… What do you think, Harry?” said Luna, looking thoughtful.

“What? Isn’t there just a password?”

“Oh no, you’ve got to answer a question,” said Luna.

Deathly Hallows, chapter 29 (The Lost Diadem)

Although it would be possible for a teacher to give the eagle a list of riddles to use, it seems much more plausible that the eagle is partially sentient, and dreams up its own riddles. (If nothing else, to avoid it running out of unique riddles and having students remember the answers.)

Then consider the “pureblood” password for Slytherin’s common room. There’s a racial undertone to that word which means I can’t see Snape setting it as a password. It could be a prefect, but it’s implied that prefects don’t set the passwords, they just learn them like everybody else (I don’t have a reference to hand, sorry).

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    All groups doesn't have guardians to guard their common rooms. Slytherin common room entrance is just a stone wall in the dungeons which opens if correct password is spoken out. – axelonet Aug 8 '15 at 17:25
  • @AdityaBlaze Sure, but something in that wall has the intelligence to decide whether somebody gave the right password. – alexwlchan Aug 8 '15 at 17:26
  • Well, in that case a solid example is the password of Dumbledore office. It is his favourite candy Lemon Drop(UK) [Sherbet Lemon(US)]. It clearly shows that his password is set by himself and not by the Staircase. – axelonet Aug 8 '15 at 17:36
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    @AdityaBlaze Unless the Staircase is enchanted to pick passwords with obscure association to the Headmaster... – user50379 Aug 9 '15 at 2:14
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    @AdityaBlaze Other way around: it’s sherbet lemon in the UK editions and lemon drop in the US editions. – Janus Bahs Jacquet Aug 12 '15 at 14:17

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