I think that Killer is a Pied/Clearwing and Mystery is a yellow face 2? I'm still not 100% sure tho. Heres a couple pics, hopefully, they are good enough to tell.
They are very hard to take pictures of at this point, due to the eggs.
Killer is a dominant pied. His base colour looks grey in your signature, but can't tell in the photo. Dominant pieds have clear flight feathers. He is not a clearflight or a clearwing these are both separate mutations.
Mystery is a yellow face recessive pied sky blue. There is very little spillage of yellow on the body so the yellow face type needs to be checked by her breeding results