If the feet are yellow then they probably are SGs. Hatcheries do sometimes make mistakes, and sometimes they just substitute different breeds. It is my impression that they have white earlobes, but I am not 100% certain. It will take several more weeks to be sure of that. Maybe 12 to 14 weeks.
Looking closer, I think those might be Andalusians instead of SGs. That could explain why the one looks raptor-ish. The pigment on the feet appears white, not yellow, and I believe these will have white earlobes. So the first blue one could be a cockerel. Time will tell.
I think they are all females. If the barred birds are definitely barred Plymouth rocks, then they have to be females because all are single barred, not double barred as males would be.
The first one actually is quite pale, but the green wash on the legs is another female trait in barred rocks...
1, 6, 7, and 9 are your definite cockerels. A few others like 4 and 8 are suspicious.
1 through 5, maybe cuckoo Marans mixes.
6 and 7 could be anything since there are many white varieties out there. They could even be red sex links crossed to black or blue chickens.
8 is a Wyandotte cross...
It has a small, pale comb, but I suspect it is a cockerel. Because of the splotchy coloring and the mahogany at the wings. Time will tell. I still don't think you could say one way or the other on this one with certainty.
He looks a lot like a buff Orpington cross, but since you say he came from a blue egg that can't be right. I really don't know of any very large and fluffy breed that lays blue eggs, so the mother must have been a mix. He is very beautiful.
He did not inherit several Legbar traits. His skin is...
It certainly looks to be a male, but Wyandotte females can get big, colorful combs early. So I wouldn't say it is 100% going to be a rooster. One thing to watch is the feathering on the shoulders. If it is nicely laced then it may be a female. If you see solid colored gold to red patches with...
It's is gold based, not silver based, and probably has the mahogany gene for deeper red color. I see no indication of blue genetics. So it will probably be mostly red with black leakage. I'm not a genetics expert, though. That's just my take.
Of the pictures when they are older, I think the first three are crele OEGBs, the fourth is a spangled OEGB, and the last is probably a self blue OEGB.
Some don't have the white legs that OEGBs are supposed to have. At least that's how it looks in the photos. But I can't think of any other...
It's not a RIR or NH. Maybe a Cinnamon Queen, the type that are red and white and are basically the same as any number of other red sex link brands like Golden Comet.
However, the chick's wing feathers look buff colored, not white. At least in the picture. So it could be some other breed or hybrid.
The mother is very unusual for an olive egger. Looks like one parent of her was laced. Her comb is also unusual. It looks close to a Silkie type comb.
As far as gender goes, the fact that her facial skin is dark makes it a lot more difficult because that color will mask any redness. And that is...
1 is probably an old English game bantam.
2 Golden Sebright
3 frizzle black Cochin
4 Probably a Millie Fleur D'Uccle, but could be a buff Brahma. A clear picture of the comb would determine which it is. Brahmas have pea combs, D'Uccles have single combs.
5 maybe black tailed buff Japanese bantam
I am not sure on chick 2. Nothing I can think of is an exact match. It has yellow legs, so not an old English game. Other breeds I dismissed are Rhode Island red bantam and Japanese bantam. It could be an Easter egger. If it is not clear in a few weeks, post again.
Those pictures are better. I think she's a female black Minorca. I see no male specific feathering. Minorcas are known for having very large combs and white earlobes. They lay large white eggs.