A free Runner drake - with free delivery too! That sounds like a great deal!
Personality wise...well, it varies by bird. I have a pair of Runners, and my little duck, Maisie, is a big sweetheart and the most confident duck in my flock - she's always the first to investigate anything. My drake, Rubee, is...well, a drake
He's a little pushy and...well, mean with the other ducks, and he's the dominant drake in the flock (when everyone's penned together). But, like I said, it varies by bird. What I can tell you is that my Runners have been handled since they were a few days old, are not at all skittish. The personality of your drake will depend on how much time the people who hatch him spend with him.
Drakes in general aren't loud. They're too whispery and raspy to get the volume to a irritable level.
To introduce the Sunny to a new duck, I would put the new duck someplace where they can see and hear one another (while being physically separated) for about a week. After a week of getting over the novelty of a new duck being around, I'd let them loose together and carefully monitor their behavior. Ducks can get nasty with one another - my Runner drake has bit at other ducks and ripped out bill-fulls of feathers - however, with just two ducks, I think they'll be happy for the company, and will get along just fine; and yes - they will cross-breed! Sunny probably won't incubate her eggs though (Pekins rarely do - they start, and then get bored and abandon the nest halfway through), so you'd have to buy/build an incubator if you wanted to hatch any.
