I have also noted that my Tomaru, although Not fibro, put a Lot of dark gypsy face on their crosses. I have crossed Araucana to the Tomaru and gotten extremely black birds, even black on the soles of the feet, black eyes, gypsy faced. They share some common ancestry so I am trying a cross between the breeds and recently put a Tomaru hen in with the floppy combed Cemani rooster.
This is a Tomaru/Araucana cross cockerel. Not fibro but some amazing blackness considering no Cemani used. This cockerel is also showing a lot of purple sheen (Violaceous) which may be coming through from the ancestors common to the Cemani too.