My $.02... The chicks with the defined Cleopatra eyeliner are likely pullet Bielefelders. The little guy with the more red head and smudged eyeliner is likely a cockerel Bielefelder. Agreed with others that the black chick with white head dot is some kind of barred breed- and from the tiny comb...
The way he carries himself reminds me of a Langshan- but he has clean legs so maybe a Langshan cross? Doesn't jump out as any purebred but I'd happy to be wrong!
And I agree he's a cool looking bird.
Especially if you got them at a 'big box feed store', several of them look like high-production hybrid egg layers.
#2- Midnight Marans
#3- Color Pack Easter Egger
#6- Silver Sussex as said above!
The good news is you'll have lots of eggs in the not too distant future! Pretty birds.
Definitely a cockerel, but the 'three rows of peas' turns out to be largely true, but not an actual 100% determination. Totally use it as rule of thumb, and makes me watch the 'three peas' much closer as they grow!
Essentially you'd be breeding more EEs.
With the crosses you've listed you'll at least get green/olive, blue, and light blue/tinted.
With the pea comb on both roosters, I'd expect it to be unlikely you'd get brown eggs, but maybe on the more olive side of green than true green depending on...
With the single comb, and feathered legs- I'd guess a salmon faverolle mix. Plus they're super mellow and can end up at the bottom of the pecking order in a mixed flock.
Should have a super engaging, sweet temperament!
Isbars and Welsummers are two relatively common clean-legged breeds that often lay speckled eggs. Since EEs are wonderful mutts, you could have mixes of either. Based on the pullet in the last photo, I'd bet on Welsummer.
Really pretty egg- hope you get lots more like it!
Based on the comb and wattle already showing, I'd guess cockerel as well on the RIR. But on the leghorn, I'd say it's too early to tell. Leghorns have much bigger combs at maturity for both hens and roosters- so it's hard to compare the two!