Mine did the exact same thing :( had red female-like breast feathers come in and then the next week all black and started crowing at 4 weeks... Such a bummer!
#1 looks like a blue silkie
#2-#3 I'd guess splash silkie since lavender silkies are still pretty rare iirc
#4 need more photos
#5 the light feathered legs and small comb (assuming pea comb) would mean brahma
#6 doesn't look to be frizzled, if it has a straight comb and feathered legs I'd bet...
Just thought I'd update y'all on Rudie! He's feathering in well now, we're pretty sure he's gonna end up being a pullet and is developing the same as our other ladies currently! Thank you all for the reassurance, I had never had a chick feather that slow before, out of hundreds over the years...