I got some Cream Legbars around five years ago, and one turned out to be a cockerel. I know. It shouldn't have happened because the chicks are auto-sex. I named him Strawberry, and when he came into his hormones, he did so with a couple other accidental cockerels which were Marans (also auto-sex but MPC really messed up two consecutive orders of pullets.)
Anyway, the Marans were sex-crazed anti-aircraft missiles, and Strawberry could mate a hen right next to me and there would be no squawking, feathers flying, or drama of any sort. He's been the kind of rooster that has never needed any guidance or discipline whatsoever. Five years later, he's still a perfect gentleman.
His son, Toots, is a different matter. Toots is from Strawberry, a pure Cream Legbar and an EE hen. He's beautiful and looks a lot like an EE roo except for lack of muffs and he has the CLB crest.
Toots doesn't have the gentlemanly regard for the hens his daddy has, but he's still well behaved and has never been the least human aggressive. In fact, his only flaw is that he refuses to listen to a hen that is trying to refuse his advances, in fact, he will give chase and not give up until she submits. He definitely has the wear-her-down-wear-her-out technique that his daddy simply has never had.
Toots, however, is a perfect protector, as is Strawberry. They will always be on sentry duty as the hens dirt bathe or are scratching up bugs. In fact, the two roosters saved the entire flock from two renegade dogs that swooped in to attack the flock. The roosters led the dogs a merry chase at risk to their own lives, disappearing with the dogs. I had resigned that they were lost or dead. They surprised me by showing up the next morning with badly frost bitten combs from being out all night in sub-freezing temps.
The female offspring from Strawberry have all been blue egg layers since they were eggs from blue egg layers. But I think that it's the rooster that carries the gene for blue eggs so it may not matter what breed you would mate him to. I could be wrong since I'm not a genetics expert. I'm willing to be corrected.