Some things I have tried with our two roosters are simply going about my business when I enter their coop and run, and if they approach me aggressively (run at me, peck my feet or bite my leg), I get down on their level- and back them off. I usually don't have to move toward them- just hold my ground and keep facing them if they try to circle me. Sometimes I have had to move toward them until they relinquished and walked away. After doing this consistently, they have learned that I'm not going to harm them and also not going to tolerate their behavior (rooster-like or not!)
When they are on their roost bar and are more relaxed, I pet them, touch their combs and wattles, and they seem to enjoy the attention. I try to be more sensitive when I first enter their space- not rush in and instead give them a moment to adjust to me being there. It has been a challenge but worth it to me. Because of their recent fighting with each other, I have their coop and run separated so they can be together but through fencing. I have heard great success from others who have had more than 4 roosters together in a bachelor pad. I wasn't up for increasing my rooster flock (who are separate from the hens also) so opted for separation. Good luck. Roosters can be wonderful and their big personalities and their antics can be fun to watch.
