Unquestionably a hen. Look up the difference between hackle and saddle feathers--Hens have soft, round-tipped feathers on their backs and necks. Roosters have pointy, shiny feathers on their backs, necks, and wings.
Looks like a cockerel. Not quite sure though. Looks like there are some rooster saddle feathers towards the top, but then, a lot look rounded. Maybe wait a couple weeks.
That is (I think) a pullet I have one Light Brahma hen right now, I used to have three. So I am pretty sure, from the looks of it, that you have yourself a pullet.