I feel you have read my comment incorrectly so I'd like to clarify. At no point did I say that a character could not be voiced by someone of the opposite sex. Quite the opposite actually when I cited a male character that has been very successfully voiced by the opposite gender (once again, referencing Bart Simpson). I can agree with the comment you made that robots are (or) can be genderless. I do, however, feel that in this particular situation when I hear a clearly female voice come out of a character, it is understandable for my brain to say, "Ah, that is the voice of a female. I am going to consider this character to be a female, especially as it has no other gender defining characteristics." Your rather blunt opinion that "what [I] said is wrong" is just that, your opinion. If you actually respected my opinion you would have simply given yours in response as another perspective to consider. i.e. I respect your opinion that BMO is genderless. I, however, view the character as female.