What are the connotations of the word "Raven"?
It is usually associated with something sinister.
The plumage of the Raven is particularly dark and this may be why it is often associated with a sinister theme. An example would be the short story The Raven by Edgar Allan Poe.
A raven also appears in Dickens' Barnaby Rudge. The eponymous hero has a pet Raven called Grip. Although not entirely sinister, Rudge is portrayed as being unstable and this is symbolised in the character of Grip.