I would have to say that the buff orpingtons are by far the sweetest breed of all that I have ever had. Yet, I have a flock of 10 young delaware pullets that are showing extremely friendly traits as well. They can't seem to get enough attention and love to be petted.
I have 27 free pasture hens of which 19 of them are buff orps. As Jody stated, they are always under foot. People laugh at me and those hens because no matter where I go in the pasture they are all under my feet and I am forever tripping over them.
One buff orp hen in particular is Ms Personality. We call her Ms Gabby. She pecks at my pants and shoes to get us to pick her up. Then you should hear the conversation with her squaking and carrying on.