I have 24 pullets, heavy layers. Had them shipped at birth from Ohio (Meyers). I made them a box 2' x 8' long and they were in our garage. First one to make friends was a RIR I called Henny-Penny. Next one was a barred rock named Jumper because she always jumped on my wrist if I stuck my hand in their box for any reason. Those two were the ones I took out on the front porch swing for a treat and 5 min of swing time during which sometimes they would doze off. Soon enough some more of the Barred Rocks became more friendly. Buff comets did not at all, and black aussies were too shy except for Midnight who also began to be a swing chicken.
They grew to where I eventually had three of the long boxes before I took them to their new coop. They were confined to their coop for about 2 weeks while I finished their pen. During that time I had little contact with them except for feed and water which my wife did a lot of anyway. They were around 9 weeks old when they were put in their coop. For a time I saw no resumption of their former affections, but gradually it came back with the barred rocks first, especially Jumper. It was all barred rocks for awhile then Henny Penny started to come around. Eventually two of the black aussies, Midnight and Oprah came around.
It is impossible to sneak up to the gate because if one sees us there is a stampede to the gate. When they were tiny I used to whistle a tune called 'Rocky Top' when I fed them. Now even if they cannot see me, if they hear that song, they absolutely stampede to me or to the gate. They explode from the coop like you cannot believe, sometimes flying 25 - 30 ft across the run towards me or the gate. The exception is when any are on the nest laying or sitting on a clutch of eggs. Then they stay inside even tho they hear me and the others have already stampeded to me. I always save some treats for any that are doing their duty in the coop and feed them from my hand while they are on the nest. Some refuse, but most gobble it up.
One barred rock I call Nipper because she jumps up and nips at my hand. She was a latecomer, and wants to be picked up and held, so I do. There is one lame runt who may have gotten hurt while in the 2 week confinement in the coop. She is a barred rock called Chirpy because she could not cluck when all of the others could. All she could do was chirp because her voice had not matured. She is a pet of sorts too but cannot muscle in with the others due to standing on one leg all of the time. I have to pick her up to see that she gets a good share of treats. I am trying to feed her cottage cheese with several herbal supplements that are good for joints to see if she will improve. I suspect that she is the only one not laying at this time (6 1/2 months old and her comb is still pink and her wattles small)
I have no fighting ever in the flock, only the normal occasional peck if one bumps into another in pursuit of food. No bullying that I can see, having smacked a buff comet off of her roost and immediately shutting off the lights two consecutive evenings when I caught her pecking Chirpy (who was just trying to hunker down and sleep where she was.) After the 2nd time I did not see that bullying repeated.
My coop and run are both large so that helps regarding behavior towards each other. Jumper will jump up on my shoulder now if I stoop to do something out there. Yesterday Midnight jumped on my arm because I was feeding Chirpy in my arms. I have had a couple of barred rocks including jumper do that. My wife and I sometimes take camping chairs to the run and sit awhile in the late afternoon. In short order I will have 4 or 5 chooks on me, lap and shoulders. My wife will always get 2 or 3 as well. Chipry does not try to do it because of her bad leg, so sometimes we just pick her up and hold her too so she is not left out. Even the buff comets have come around and do jump up too at this time of day. Barred rocks and two aussies lead this activity but Henny Penny (RIR) is never left out either. The comets are in on the act too, but strictly for the occasional treats I think.
Chickens are more interesting than I ever could have imagined. I doubt that I could kill one that has become such a pet. They cost a nickel a day to feed so that is not a concern. Most of mine will probably die of old age.