I had 4 chicks, two Barred Rocks and two Easter Eggers. One of the Barred Rock pullets was a bully, and while I had her, none of the other chicks were able to get treats because she would steal them, but she would do it aggresively. And yes it WAS a girl lol.
I also had one EE cockerel in that group, and he wasn't aggresive persay, but he was definately NOT interested in being friends. He had a job to do, and he took that VERY seriously, even at 2 weeks old lol.
Now, those two are in new homes, and I am left with Munk (EE) and Joon (BR) who are BOTH very friendly, easy to catch, and follow me from free ranging to the chicken run. I can hold both of them, and when I go to pick them up, they freeze. Neither is very loud and they get along wonderful with each other.
I am glad I was able to get 4 chicks and weed out my favorites. It worked out perfectly. I also researched EE's and BR as best I could and know both breeds have friendly traits (usually). Now I am left with two total lovebugs who hop on my arm and just chill, it's great.