Runners are pretty calm,but the drakes can be a little rude.My drake was just doing his duties when he'd chase me off (I use to be super scared because there were two of them.They can make great pets.
And yes,there are certain types.There is the Fawn&white,The fluffy headed type,White,Penciled,Black,Buff,Chocolate,Cumberland Blue,and Gray.
Most ducks have different voice translations.Males have a dim quack whap kinda voice (It's really hard for me to describe),while the females just quack and peep (Usually small ducks peep and quack.).Drakes also have a small curl all the end of their tail,while the females have nothing on their tails,it's usually spread out (Keep in mind these things do not start appearing until the ducks become older then at least 4 months.)Some ducks like Muscovies don't quack or have curls.Male Muscovies hiss,while the females peep sorta,they are also vey quite ducks,but sometimes are aggressive.