I have had Chinese and Africans in the past who were very aggressive towards strangers, but generally just sweet to me. I would get gentle affectionate nibbles. They liked hugs, and would wrap their necks around my neck if I bent down to them. They even allowed me to examine the eggs in the nest and approach a brooding female with no fuss. They did try to remove jewelry and freckles though. The only aggression I ever got from that bunch was a Chinese gander who HATED to be picked up. Apparently it offended his dignity or something, LOL. If I picked him up for any reason, even to help him out of a low fence he'd trapped himself in, a debt was created that could only be settled with a bite. He would follow me if he had to, finally getting his chance for a single nip, then he would be ok.
My bunch now act like a gang of hoodlums, LOL. They bite the goats, the dogs, the chickens, the guineas, everyone. They do NOT bite me, or the llamas. They respect the llamas and give them some space. And they love me. Seriously, though, they are usually pretty obedient when I move them or tell them it's time to go in their house. They have never acted the least bit aggressive to me. At least not yet. Anytime one gets at ALL out of line, I pick him up and hold him close until he tucks his head in and makes sweet noises. They don't really like being picked up and held, so I think it's a bit of a deterrent, but by the time I put them down they are acting sweet. I don't get the tailfeather shake ducks and geese usually give if you bodily offend them. It's working so far at least. We'll see what happens come breeding season, LOL.