I fail to see how cooking babies in the microwave is helpful, Bolt.
I see no problem in not making the Bionicle characters look feminine. As biomechanical creatures, it's not like there'd be much use for anatomical differentiation. But having women as a minority instead of the half-and-half that real society is, it gives the idea that females are not as interesting or as skilled as males for action.
And as a female, I for one remember feeling that only having one heroine showed them as being less valuable or useful as male heroes.
I'm sure the issue is not in female involvement. Everyone in the storyline is 'involved' some way, and that is even more so for main heroes. I think the issue is in the numbers. Make it realistic - have half male, half female, just like in the real world. Having women as a minority gives the idea that they are mainly unfitting in an action storyline.
I haven't heard a single male object to having more women in the storyline, and I know that most, if not all, female fans would prefer it that way.
Then again, the one-sidedness has been there from the beginning. Lego dug itself into a hole. If they were to suddenly change the ratio of men to women dramatically, it's more likely now than ever that, from a sales standpoint, their ratings and profit would drop substantially. The recurring minority-majority has established the idea already to the fan base that having fewer women is better, and it is likely that now if more females were added, kids would stop because Bionicle was 'getting too girly'.
Bravo, Lego. Shoulda thought that one out in the beginning, shouldn't you?