....But she sure as hell isn't straight and that's why I'm peeved off.
A large majority of the people who saw tumblristas/sjws/people like myself who often have their arguments reduced down to not mattering by people who enjoy technicalities, have tried to say that the only reason we're upset is because a white female is playing a racially ambiguous but hinted Asian character but that's disingenuous of the actual argument being made here.
The actual argument being made here is that Scarlett Johansson is playing the character, meaning that they are appealing to a mass audience (as many have said). If we're going to claim that that is indeed the reason, then we have to consider the fact that they are not going to allow Mokoto to be as sexually ambiguous as she was in the anime, which is important.
In short: Mokoto has two physically female lovers named Ran and Kurutan who she has an explicit threesome with in the manga and who reappear in the anime on short occasions, these occasions being: One of them handing her a drink while in a skimpy maids outfit. One with Mokoto Kusanagi walking away from a bed in which the two of them are intimately physically intertwined. And lastly, and possibly most importantly, one where Mokoto undergoes a procedure in which someone legally connected to her needs to oversee. While she does have relationships with men on multiple occasions, very few of said relationships have as much staying power and consistent under-toning as the ones between her, Ran and Kurutan.
There are also multiple scenes, such as her suggesting to her fully male (with the exception of herself...maybe?) unit, that they all head to a nudie bar if a mission doesn't go well. (I don't doubt bi-nudie bars but how far are we going to stretch here, honestly?) And scenes hinting that she has short escapades with men (remember that blink and you'll miss it shot with the guy from Section 1/8?)
Now see, you can argue that Mokoto's sexuality doesn't matter -- but it does because it lends itself to the main theme of the series. That Mokoto herself doesn't have a soul/potential thing that makes her/him/them 'themselves'. By making her sexuality hard to pin down, you further enforce the idea that we have no idea if this woman is even a woman.
Just so we're clear:
Mokoto could be: A trans male character in a female body, hinted at by his sexual escapades with women. A bisexual wo/man. An omnisexual wo/man. A pan wo/man. A white wo/man. Whoever.
Mokoto can't be: Completely and utterly straight.
And that's what annoys me. Because just like my well documented issue with freedom of speech/sexualization on the internet, I know that everyone's going to go to bat to say that the specific parts of the character they like (in this case, the potential for Mokoto to be white) but no one's going to stand up and defend the expressions of the character they don't like (in this case, Mokoto's bisexuality if it gets removed). Which is why 'well Mokoto could be white' feels like an excuse -- its disingenuous and made up on the spot, only right because of technicality. Not honestly made for the sake of the character. And if she 'can be white' then she sure as fucking hell 'can't be straight'.
TL;DR: I'm not mad that Scarlett Johansson is playing the character. I'm mad because they're appealing to the broad audience through Scarlett Johansson and that may mean removing what makes the Major unique, the fact that she's potentially a trans or bi/omni/pan sexual character and most definitely NOT straight.
TL;DR2: This is become Wol, sexualization and the freedom of speech argument all over again. If those of you that actually care about what you claim you care about are telling the truth, then I expect to see you rioting when and if they make Mokoto straight/sexually gray. If not then I might actually get so pissed I wander up and down the countryside killing white-straight fuckboys with a spoon.