My dUccles got their tail feathers plucked by the standard hens.. not the roos.. but my silkies do fine with the bigger roosters.. the polish roo got his rear end handed to him though.. but in retrospect he asked for it... .. lol
I have 2 bantams & 4 standard size hend. My D'Uccle gets picked on by everyone but the Sebright holds her own, sort of. If I had to do it over I wouldn't mix bantams with standard size hens,mid build them a separate coop.
Btw, I love Emus too, but they live thirty plus years. I can't guarantee I'll be in one spot long enough I care for them properly. They are so funny and sweet though - *sigh*