We have barred rocks, EEs, leghorns, a producion red pullet, & barnevelders - about 3 months old.
Both our barred rocks are very friendly - one of them loves to hop up and set on my lap - she stays there till I put her down. Easter eggers are also fun for kids - ours are calm, friendly chickens and should lay blue or green eggs when they start laying.
I believe production reds are part RIR. The production red we have now is friendly enough, but we had to get rid of two others because of their aggressiveness to the other chicks (when they were still babies even). The first one pecked two chicks till they were bloody. We exchanged it for another of the same breed and a week later, the new chick really went after the second production red (the one we still have). It pecked her till her back was bald and some tail feathers were missing and she had bloody areas. This happened when the chicks were still little (less than 1 mo. old) and both times, they were outside in the grass with an extra large dog cage over them. They were not crowded or hot. After getting rid of the second mean production red, we haven't had any other problems like that. Our current flock of 11 chickens gets along very well together.
I don't know if production reds & RIRs have the same temperament or if this behavior is typical, but thought I should mention it just in case.
We did have a couple buff orpingtons several years back and I agree with the other posters - they are a calm, friendly breed.