A few of my roos will check out nest boxes and encourage pullets and hens to lay in them after he's determined the nests are good. I've had a rooster who was injured - so he didn't leave the coop much - and he babysat eggs for a broody hen by sitting on them during her daily constitutional outing, and then also helped her keep the little ones safe when they hatched...
My dominant rooster will run at other roosters getting too aggressive with chicks, protecting them.