Out of all the different breeds i have had the nicest are my cochins and brahma.... the meaneast roo i ever had was a cockoo maran he attacked me everytime he'd get the chance.... as far as meanest hens go my little white japanese is vicious to the other girls as well as the almost 3 month old babies that are out with them. My cochin bantam rooster is pretty mean as well. He attacks little kids and small dogs but is great with the hens.