While her 'shell' being sexualized was iffy, and that was not explored in itself, the Major's ghost is an interesting sexual creature indeed. In contrast to any of the anime, she has no discernible sexual interest in Batou, and her encounter with a prostitute implies not only is she bisexual, but that she has a kink for completely human people. Anime Major may let it all flip flop out, but in character, she is a complete cold fish in comparison