Oh, Brahmas are the pussy cats of breeds! Generally they are very docile, both with humans and other breeds of chickens.
Of course, there are individual exceptions in temperament, and in any isolated situation, even the most docile Brahma will put her foot down and brook no foolishness from underlings.
I have a nine-year old Light Brahma hen who lounges about all day long, only occasionally joining in flock activities because she's above it all, been there, done that. But let a juvenile race by and annoy her, interrupting her serious relaxing, she is quick to lash out with a stern peck.
With humans, you won't find a more people friendly breed.