Head:
Professor Filius Flitwick
Founder:
Rowena Ravenclaw
Blazon:
azure, an eagle or (that is, a golden eagle on a blue field, hence the Ravenclaw colours of blue and bronze)
Why isn't the Ravenclaw animal a raven? Amanda Lewanski on HP4GU suggested that "raven is an old, poetic term for dark or black. Rowena might have been associated with an eagle (Animaga form, familiar, whatever) which had black claws."
Ghost:
The Grey Lady
Sorting Hat's description (PS7):
Or yet in wise old Ravenclaw
If you've a ready mind
Where those of wit and learning
Will always find their kind.
Common room location:
Ravenclaw Tower, which is located on the west side of the castle (OP1 cool
Ravenclaw values intelligence, knowledge and wit. Its animal is the eagle, and its colours are blue and bronze. No Ravenclaw house ghost is directly mentioned in the books; however, the Harry Potter movies name her as the Grey Lady. The house was founded by Rowena Ravenclaw. According to Rowling, Ravenclaw corresponds roughly to the element of air. The Ravenclaw common room and dormitories are located in Ravenclaw Tower on the west side of the school. Very few Ravenclaw members are specifically mentioned, and, in general, they are not seen much in the Harry Potter books.