I would wait and see on his temperament. You don't want to introduce any aggressive genes into your flock.
If he passes that test, then I would say that a Production Red makes a great flock roo. They often have great egglaying genes, and you can breed them with a variety of birds to make...
The red one looks like a Production Red (although the leg color is off), the barred one looks like a Barred Rock, and the multi-colored one looks like a mixed breed.