It was never said, but there were some clues given.

* He was a man when he was alive, but is now a ghost.

* He wanted to protect "the children."

* At one point, he remembers he was chased by dogs. ("A Crime of Two Cities")

* He can only be seen by those to whom he reveals himself.

* He can read and feel emotions. He cannot hear.

* He communicates by writing. He cannot talk.

* He can travel through time. ("Just in Time")

* He can travel across the Internet. ("Who is Max Mouse?")


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