We have an americana rooster, Elton. I got him last May, I bought 8 hens, the rooster was free. I had to choose from a dozen roosters all destined for the pot. I chose the most beautiful..... brown, black, green. He was tiny. My husband laughed at him when I brought him home. He was just a little cockeral.
Now he has 3 inch spurs and is double the size of any of the hens. He is a real gentleman..... feeds the girls, finds food for them, will only eat if there is plenty. He has never attacked us. When there were chicks, he would take them for rides on his back. Seriously.
I think though he is assertive. One day my husband came home to find a hawk in our run, sadly, eating a young chicken. Elton was standing a few feet away. He did not hide. Also, we have not lost a single chicken to night time predators. Knock on wood! I attribute that to having a good roo.