And, behold, six men came from the way of the higher gate,
which lieth toward the north,
and every man a slaughter weapon in his hand;
and one man among them was clothed with linen,
with a writer's inkhorn by his side:
and they went in, and stood beside the brasen altar.
Ezekiel 9:2
Q: Who is this in Linen with the Inkhorn?
I'm guessing it's Christ.
1- The 6 men represent the first 6 of 7 Last Plagues poured out symbolically by Angels in Revelation. (And I heard a great voice out of the temple saying to the seven angels, Go your ways, and pour out the vials of the wrath of God upon the earth. Rev.16:1)
2- Each man's slaughter weapon are their Plague to Pour out they carry. (And the first went, and poured out his vial upon the earth; and there fell a noisome and grievous sore upon the men which had the mark of the beast,...Rev. 16:2, etc.)
3- As for the brasen altar they stood beside--it is in the Temple. The Temple in Heaven is from where they come from. (And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen...Rev.15:6)
4- The man with the Inkhorn makes 7. The Final 7th Plague is Christ Himself's own Return. (And the seventh angel poured out his vial into the air; and there came a great voice out of the temple of heaven, from the throne, saying, It is done...And there fell upon men a great hail out of heaven, every stone about the weight of a talent: and men blasphemed God because of the plague of the hail; for the plague thereof was exceeding great. Rev.16:17,21)
5- The man with the Inkhorn places a mark on the foreheads of those 
opposed to the abominations--this obviously is the sealing in the foreheads of those who follow the Lamb in Revelation---opposite of those who receive the mark of the beast. (And he called to the man clothed with linen, which had the writer's Inkhorn by his side; And the LORD said unto him, Go through the midst of the city, through the midst of Jerusalem, and set a mark upon the foreheads of the men that sigh and that cry for all the abominations that be done in the midst thereof. Ez. 9:3,4)
6- Although in Revelation the 7 Angel's with the vials are identified as wearing white linen, the one here in Ezekiel is singled out. Christ is the pure linen. (...for he hath clothed me with the garments of salvation, he hath covered me with the robe of righteousness, Is. 61:10)
7- This one in Linen with the Inkhorn has a special work. (Then I looked, and, behold, in the firmament that was above the head of the cherubims there appeared over them as it were a sapphire stone, as the appearance of the likeness of a throne. And he spake unto the man clothed with linen, and said, Go in between the wheels, even under the cherub....Now the cherubims stood on the right side of the house, when the man went in; and the cloud filled the inner court....and the court was full of the brightness of the LORD'S glory. Ez. 10:1-4)
8- This one with the Inkhorn seems to be in charge. (And he spake unto the man clothed with linen, and said, Go in between the wheels, even under the cherub, and fill thine hand with coals of fire from between the cherubims, and scatter them over the city....And the angel took the censer, and filled it with fire of the altar, and cast it into the earth: ...And the seven angels which had the seven trumpets prepared themselves to sound. Ez.10:1/Rev. 8:5,6)
9- The Inkhorn is another clue...if one pictures Christ speaking to us through John in 3 John via under the guidance of Inspiration.... (I had many things to write, but I do not wish to write to you with pen and ink; But I trust I shall shortly see thee, and we shall speak face to face. 3 John 1:13,14)
And one cherub stretched forth his hand from between the cherubims unto the fire that was between the cherubims, and took thereof, and put it into the hands of him that was clothed with linen: who took it, and went out.
Ez. 10:11