This may seem to be a silly topic but I can't make any redheaded villagers. My "Lost Children" village at one time was completely redheaded. Now my "Secret City" village is filled with black and dark brown-haired villagers (no blondes either). Many generations ago I had a female with blood-red hair but she didn't pass it on to any children.

Has anyone figured out breeding plans? When I had the completely red-haired village, I started to let only the darkest redheads breed and eventually I started to get a mix again.

It's a pretty monotonous-looking dark-haired bunch in the Secret City. Any ideas?

As I know, if you breed a blonde with a brown or blackheaded, it could, I say: "it could", make a redheaded villager!!

There is a long discussion in VV2 genetics started by Complexity which should answer all your questions. Basically, if you can imagine all hair colors in a line from darkest to lightest, then your child will fall somewhere between the two parents. If you have no redheads or blondes, getting a redhead maybe a little harder but not impossible. There are some other possibilities here, too. Sometimes a child is born who is way out of the expected range of colors from the parents. And there are events which can change a villagers' appearance.
I like redheads too. So Good Luck!

The hair colors are not a straight line from lightest to darkest - they line up from black, to brown, to red, to blone, and generally follow a pattern of going from darkest to lightest hair color, but it isn't absolute.

Check the hair colors in the Male_heads and Female_heads image files in your game directories. Imagine the order of those heads as a scale - if you interbreed a head from the top and a head from the bottom, the result is likely to be near the middle, for instance. If you bred from the middle and the bottom, you'd get a result near the three-quarters mark.

Complexity's guide provides the math and the specifics, but this is enough to give you a general idea of how to breed for hair color.

P.S.: Complexity's guide is for VV2, but fear not - all the conventions he explores there seem to hold true for VV3. The genetics system does not seem to have undergone any fundamental changes.