My roo has started crowing steadily this week, and he is almost 13 weeks old. Other than that, I haven't seen any rooster behaviors such as mounting, guarding, or food sharing. (He will not be full grown for a few more months.) He acts mostly like a dominant hen and seems much more interested in food than than roostering (the big pig). Unlike the hens, however, he will rarely come near me, and I am keeping a watchful eye for any aggressive behavior, for which there will be consequences!
As far as mixing small and large breeds, I hope you hear from folks with more experience. I can only tell you about the flock we had when I was a kid that was mixed bantam (60%) and large breed (40%). We never had any problems, but in our case the rooster was smallish (about as big as the large breed hens), so he never hurt any hens during breeding, and we usually had at least 10 hens with 1 roo (plus maybe a young roo-in-training, as long as they didn't fight). If you have only 1 or 2 bantams, you run the risk of them getting picked on or being overly bred by your big roo. Hope you get more advice about this.
Just a general observation about human and chicken interaction- don't confuse "sweet" behavior toward people with how the chickens act toward each other. I have a very friendly hen (toward me) who is quite aggressive with the other hens, drives them away from the food if she can. Luckily she is the smallest of the bunch (a White Leghorn), and as the large hens are outgrowing her, I am seeing less aggression as the pecking order readjusts.
