Docile/ non aggressive roosters. On BYC, have consistently seen many comments on Docile male Orpingtons, and docile male Salmon Faverolle.
we have female buff orpingtons -calm, good personalities although one was a bit flighty. We have had a few SF females, from two sources - the most chill, laid back chickens we’ve ever encountered...all of them. We had a male SF for about 5-6 months, also calm and was not aggressive nor a push-over in the pen with 14 other males of same age, various breeds.
we’ve had many aggressive male cockerels, of breeds never mentioned for calmness. For example all 3 Marans males (one black copper, one blue copper, and one splash) were all quite aggressive within the flock, but they were young and hormonal too.