I have two. They are definitely different, from eachother and other breeds. One of mine is very prone to dart away from the others, while the other is more laid back. When they were teenagers, they did this cute breast-bump thing with eachother. It looked like a sort of challenge/game but didn't include any pecking and they would do it randomly then stop. It was cute but they didn't continue after maturity.
As far as dumb, I'm learning to tolerate one of them that I feared was just dangerously stupid. Always a raspy squawk or grumble, no gentle coos like the other. Also, she was the last to figure out how to use a nest. She laid them on the floor until one day she became curious about the nest and since is fine. Now, either Faverolles will make a new nest of their own in bedding if the nest isn't available.
They don't forage aggressively like other chickens (that have four toes) but they will gently rough up the ground to mix things up. They don't eat grass or dig any up, and they will totally avoid forage areas that 'belong' to the higher rank hens, even if I try to lure them to it with some scratch or bugs.
Finally, their muffy cheeks seem to substantially block their vision. I have to really show them new veggies before I toss them on the ground or they can miss them entirely. Oh, and they seem to prefer veggies to meat. They like meat scraps, but will return to cabbage and tomatoes while there's plenty of protein left.
Sorry to branch into some non-intelligence related stuff, I felt it connected. Long story short, I really like them and I'm glad to have them as the matriarchs of the flock - and that has not been my steady opinion, including wanting to outright get rid of the dumber one. I'm over that.
Good luck with yours but I recommend a pair.
