The question remaining is: Who is Mr. Datchery?

The story that I love most out of all of Dickens’ novels is The Mystery of Edwin Drood. Dickens wrote this, and many of his other novels, in serial form where one or two chapters would be published monthly or weekly in a magazine and later printed as more expensive, hardcover books. Serializing his novels made it cheaper for poorer people to buy his books. Edwin Drood is Dickens’ last story, the one he was writing just prior to his death. It is the story of a young man, Edwin Drood, who mysteriously disappears one night after a storm. Bit by bit, the reader finds out that Edwin’s uncle, an opium addict, wanted him dead. Unfortunately, Dickens died before he was able to finish the last few chapters—the final installment in the serial. Because of this, it is missing the part where the murderer is revealed and the mystery remains unsolved. Although it is darker than most of his other novels, Edwin Drood remains my favorite because it leaves the last segment to the imagination of the reader.

At the end of the novel, it is fairly obvious who killed Drood and why he did it. But in the last couple of chapters that Dickens wrote, a new character who takes up lodging in Cloisterham for a couple of months. Dickens makes it fairly clear that Mr. Datchery could be a person (perhaps another familiar character) in disquise (i.e. Mr. Datchery has unusually bushy hair, suggesting that he could be wearing a wig).
So my question is, who is Mr. Datchery? There are many possible answers to this question, but no one will ever know what the original author intended.