Miss Austen and the devil himself

Your new boss recently inherited his father's company. Everyone has worked to close a major deal as well. Since Halloween is also the boss's birthday, he decides to thank everyone by hosting a masquerade ball on Halloween Night. Unfortunately, your date bails on you at the last minute.
As you're making your rounds to say goodnight, a mysterious stranger strikes up a conversation ...

Happy Halloween, everyone! This is my entry for the Halloween Vault Day 24.
So who exactly is this mysterious stranger?