I think the biggest one with the comb and blue ears sticking out is a rooster. Recently hearing a lot of noise out of that one too. Not as loud as roosters I've heard but noisy! My sister disagrees because it's very affectionate and has bonded the strongest with the family (it acts like a dog).
There's one that has a super fluffy head and I think she's a girl.
Then there is the one with the buff-ish neck, and I have no clue on that one.
Any help would be very appreciated!