I have a similar question. I just lost my beautiful black Indian Runner drake, "Daddy" to one of my dogs today - my fault, when I went in the run to check water, I must not have closed the gate all the way and he got in.
I think Daddy was gotten protecting his 3 hens.
He was a very good drake for only 4 months old - protective of his girls without being a jerk, only mated the one 'hussy' duck who wanted to be mated. When she hurt her leg, he waited until she was better to start mating again. On top of that he was head male bird in the run - my alpha cockeral was afraid of him.
In general, will my three hens be happier if I get another drake, or by themselves? I can get a fawn and white from a friend who has extras. It would be about a month younger than the hens. Not sure of the personality, since who knows which one we will be able to catch!
Or if the drake is a good idea, should I try to get one that is more tame - mine are still skittish of me even though I've had them for 3 months. Daddy was finally getting a little tamer to come close when I would give the chickens treats...
I didn't think I was that attached to the ducks, but Daddy was a good one. He left some big webs to fill.
RIP Big Daddy.