Sissy I agree on the first one, I would say female. Third one looks more to be a heavy male. The shape is more streamline and the pectoral fins are far more pointed which is a indicator of a male. But keep in mind even for a well trained Koi eye, (Which I am not!) It's still a guess. The butterfly is any one's guess on sex, But at least I can somewhat name it. It's a Doitsu Matsuba. My favorite of the three.
The first one, which we both agree we think is a female looks to be a Sushi that has 100% no Hi (red) color,(NOT COMMON!) or it could simply be a white Doitsu matsuba but I'm more comfortable with sushui. The third fish, lol, I really have no clue how to classify it, If it didn't have the black markings I would say a ogon, with the black markings, maybe a extremely weak sumi Shiro Utsuri?
Please don't take offense Tmann, but the two whitish colored ones are basically MUTT's. lol I do like the first one, it's a unusual coloration for a Doitsu. Don't get me wrong, Mutt's deserve love and yours look to be very well taken care of very healthy and pretty fish. But trying to identify by looking at the books and at illustrations I just can't put a for sure classification name on them.