If you are talking about QAnon, nobody knows who he really is. However he has gained notoriety on Internet Forums over the last couple of months for his fairly accurate predictions about Political events in the US. He often writes in codes and users who crack the code usually find themselves with a prediction of a future or current event related to US politicians, specially those involved in an effort to bring down Trumps administration.

Some believe he is a very privileged insider who is leaking information that wouldnt make through media bias in an effort to counter act a shadow government. Those, of course, are mere speculations as he hasnt presented himself and most likely won`t.