I'm also curious on the possible (identit(ies) of Q.
My first guess would be a military insider? The letter "Q" in the Military Dictionary has 5 definitions attached to it: The first two may apply?
_https://www.militaryfactory.com/dictionary/military-terms-alphabet-list.asp?letter_group=Q
q-message
Q-route
quadrant elevation
quadruple container
quay
Then there's the Military Phonetic Alphabet - Call Letters (adopted 1957):
_https://www.thebalance.com/military-phonetic-alphabet-3356942
Q Quebec _ _ . _ Quack Quack Queen Queen
If you select "Queen" - the Queen or First Lady in the White House would be Melania Trump. Some reports refer to Trump's Daughter, Ivanka as the "informal" First Lady (sitting in on some Diplomatic meetings).
So, maybe Melania and Ivanka might be part of or behind Q?
There's also the odd impression that Steve Bannon might be involved some how? I listened to several of his interviews after he got kicked out of the WH and when I'm reading Q's messages, every once in awhile, I get the impression that Bannon might be behind the quote? Bannon did state that "if he couldn't help Trump in the WH, he would help him on the outside?"
I don't think Q is one person but several working together?
Q states, " Manafort, Comey, Rosenstein, Podesta, Clintons, Holders, and Lynch are all on one team. We affectionately call them “The Clinton Cabal”, so they can be ruled out? I would add McMaster's and Mattis in with that bunch including VP Pence?
As for Trump's inner circle, Keith Schiller is President Trump's longtime bodyguard, now turned White House aide. Another longtime Trump associate is Roger Stone.
_http://abcnews.go.com/Politics/house-russia-probe-eyes-longtime-trump-bodyguard-turned/story?id=48341329
I don't know where Mueller fit's in, if he's for Trump or working against him?
Another thought, could Tom Fitton of Judicial Watch be involved? He seems to have insider connections.
I agree with Rhythmik, that it might be worth looking into who and what is behind Q? I have been following closely with the new Postings and Q does seem to be - a few steps ahead of what appears in the news, especially with the Mueller investigations.