When I first got my chicks I was told 2 of the 12, were Orpingtons, as they got bigger and grew different colored feathers, we found out they were actually 2 Rhodebars, Blanche & Biggie. Biggie grew faster than all the other chickens, and started growing a comb quickly as well, so we figured she was actually a he. However, Blanche did not grow very fast so we assumed she was still a she, and she was mine and my 3 year old daughter's favorite. Blanche was the first to come running for treats, would follow us around, even the only one who didnt have much problem with me picking her up. Biggie was very docile, but skittish. As they got older, Biggie began crowing at 8 weeks, and was starting to act like a rooster, always circled around the girls when they free ranged, let them get treats first, if he heard something he would try to get them back to the run. Blanche continued to act like one of the girls. Then Blanche started growing a comb and wattles and began to crow at 12 weeks. It was almost like a switch had been flipped, as soon as she realized she was actually a he, he became mean. He pecked at me constantly, not too big of deal since I was usually wearring pants when he pecked my legs, but one day he pecked my daughters leg and drew blood. Then he kept attacking Biggie, and started jumping on, and pecking at the other girls to get to the treats. So we had to get rid of him. I find it odd how different the 2 boys turned out, being the same breed from the same hatch.
In summary, both boys from same hatch:
Biggie - docile, skittish, but looked out for his girls
Blanche - became mean to chickens and humans, not very good rooster