Giants are very mellow, docile birds. They are decent layers of very large brown eggs, on average producing about 5 eggs a week. And hens can sometimes go broody, not quite as prone as Orpingtons, but more so than the sexlinks.
Dotty and Sunny are cockerels. Stripey will not have lacing ever. She is penciled, and with that single comb, I doubt she's a Wyandotte at all.
White Giants are recessive white, so that boy will produce solid black chicks, boys may develop some 'leakage' as they mature. The Buff Orpington will...
The skin around the base of the comb can flush when a bird is excited or stressed, making the comb seem pink. Cockerel combs are bright, raspberry pink/red all the time.
To give you an idea of what 'bright pink' means, this is an 8 week old cockerel. Not the same comb type, but that's the color...