You are asking for two very diffrent temperments in the same bird. Remember temperment in chickens is genetic, just like in everything else. So if you want an aggresive flock protector, you will have an agressive bird. If you want a sweet pet, you will have a quiet tempement in that bird. The key here is that it is a rooster and roosters are naturally territorial. I hope you don't want this banny rooster to protect agients preditors? He is not going to have the size to do that.
I cull my roos for many things but temperment being on the top of the list. If you have some that are fighting more than others, get snaky etc.. those would be the ones to cull if you have a small child. If you have sevral that aren't fighters (more than normal) and don't get snakey with you.. then you can also cull for confirmation, size, breed type etc.
What ever temperment your rooster has, is the temperment your next generation of birds will have. Breed doesn't always matter when it comes to rooster temperment.