Buff Orpingtons have been the overall friendliest birds to humans and fellow chickens. This might be a nurture over nature thing though as they are my daughter's favorites so they have had the most hands-on, carried around, loved on experience out of our flock. Post beginning laying, our BLRW became runners for the friendliest human birds. They are my current favorite with how much they talk to us when we are around them and that they love to be brought inside and hang out on my shoulder as I do activities. Otherwise, the EE have been the gentlest birds. They unfortunately are at the bottom of the pecking order b/c they are so friendly and the black australorps are just jerks to them. Our lowest has feather damage from their need to peck them any time they are nearby. The BAs are getting rehomed in the spring though.