Roo is white rock. they are bigger and heavier. Leghorns are kinda shortish and skinny plus usually have big white earlobes- your roo has red earlobes.
White hen with some black on neck and tail is a delaware.
Black and white all over one is a silver lace wyandotte.
Buff colored one is an easter egger- she should be laying blue or green eggs. If her eggs are blue and her legs are bluish, she may be a wheaten ameraucana.