Does Ravenclaw have a house ghost? Gryffandor has Nick, Hufflepuff has the Fat Friar, and Slytherin has the Bloody Baron. As far as I can remember, there is no mention of a Ravenclaw ghost. In Book One before the Sorting, it says that "About 20 ghosts had just streamed through the back wall." Who are all these other ghosts?

Thoughts?...