As mentioned at the beginning of this location, the riddles here can be solved with the help of torn pages and the characters from the books:

Therefore, to be able to complete the puzzles in this location, it´s necessary to find the correct character that fits the given room.
As example, we can see that there is Parry´s Hotter room with four colored stones:

The torn page says:

Then, somewhere in this level, we can find Germione with the clue for the Parry´s Hotter room

For the Sherlock Homeless´ room, the torn page mentions the brilliant green, red, blue and yellow plumage:

However, there´s a hint you get from the police officer from another room saying that the yellow actually isn´t supposed to be there.
Good luck!