I have a Turken hen that just turned a year old a few weeks ago. She's the first one I've ever had. She's very confident and feisty compared to her flockmates, which are a New Hampshire hen and a rooster that's half Cochin bantam, half mixed breed LF. She's extremely vocal for a hen and pretty much clucks and makes strange sounds all day, every day. She lays large eggs nearly every day. She's not aggressive towards the others, but to be fair, she might be the dominant hen. I'm actually not sure. She and the other hen seem to be equally matched. She doesn't have any attitude with the rooster.
She had some aggression issues with other birds when she was younger. She was about five months old when this particular flock was larger (I eventually had to split it into two flocks due to a surprise cockerel that I initially thought was a pullet). There was an Easter egger cockerel and a buff Orpington pullet that were both younger and smaller than the Turken, and she beat them relentlessly. I thought it was normal pecking order business, but it went on for far too long. In retrospect, I wonder if the only reason she didn't pick on the New Hampshire or the rooster was because they were both bigger than her.
But she's fine now. She's never acted aggressively towards me, even when she was broody and I had to force her off of her eggs. Speaking of which, she goes broody shockingly often for a young bird - about a few times per month. Nothing about her has been bad enough to keep me from getting another Turken someday.