I was never one to get to worked up over personality. I only cared about what they did. That is still the most important part to me, but I have changed a bit in my old age.
My NHs have always been extraordinarily easy to work with. Active enough, but what many would call calm. They have been a joy to manage. Easy to manage is relevant, but I can't stand roost potatoes. LOL I have had a few of those along the way.
My Catalanas have set the bar high for me. I really like the darned things. I did not realize how smitten I would become by them. I picked them up to be a side project, and now they are the focus. I was thrilled with how productive of layers they were, but what has sold me as much was their "personalities". I never thought I would say that.
They are active and assertive. I pictured a more active bird, given the class. I did not picture them being as bold as they are. They are not particularly flighty, because they are not nervous. There has been a few exceptions, but they did not last long. I have not kept any that were especially prone to panic.
They are sharp. I swear they are smarter than the average bird. They pick up on things faster than any other bird that I have had. It is hard to describe, but they have a way about them that I like. They are all business. The game breeds are like that, and you would think they had some in their background.
This does present a few challenges along the way. They do not take to newcomers well. I have to be more thoughtful about how I integrate them after I break them up. A cockerel has to be fully and mentally mature before I introduce one to a couple hens. Otherwise, the hens will fight him (and win). Once he is mentally mature enough, he will assert himself.
Their little social hierarchy is a little more complex. Once it is established, it takes a little more effort on my part, or patience to make a change. You cannot isolate a male once he has been with a group of females. He would lose weight. I do ok, because I try to let them be chickens, and keep a female with him. Or at the least make sure he can see them, or even where the females can approach the cage. This keeps them "mentally fit". They need stimulus. They are also only broke up, during my short breeding season which is about 4-6wks.
For a free range general purpose egg flock, they would be hard to beat. They would not be suited for close confinement. They would survive, and manage, but they need room to be what they are. They cannot be appreciated cooped up in a coop all of the time. Silkies and Cochins would be a better choice. I think that is the case for their entire class. It would be a shame to know they were cooped in a small coop all of the time, and I would not part with any that would be. I ask people that are getting cull layers from me if they will have plenty of room, and be let out regularly. If they have that, they will tolerate most challenges. They are far from being high maintenance. They just need room to be what they are. Going by commercial recommendations for space would not be enough.