I've found that the friendly ones are friendly and the not so friendly ones aren't interested in people no matter how many or few chicks you have. Each will have a distinct personality. Just handle them a lot in the first week and the friendly ones will be your best friends. Boys are always less friendly than girls once they mature. They prefer not to be touched.
We have a gold girl who was very friendly right from the word go. My son wanted to call her Fluttershy, but there was nothing shy about her so her name became Flutter. She loves attention and being patted. Her gold sister, Dumpling, is very sweet and friendly too.
The adults seem to be more comfortable being scooped up under their tummies with both your hands cupped round them, facing you and their legs left to dangle. Grabbing them across the back makes them panic a bit, especially your more highly strung individuals. Our daughter picks ours up all the time and they don't mind too much, and even the anxious ones barely struggle if you hold them this way.