...people have been assuming that it's a "he".
This is the twenty-first century, folks. Just because it isn't a female doesn't make it a man! Binary genders are a thing of the past. Heck, it might be a lesbiman high femme gynandroid, or possibly even an otherkin nongender transboi.
[url=https://i.imgur.com/trCMECg.jpg]Here's a chart[/url] for only a VERY small number of the possible genders this new character in Halo 5: Guardians may be.
Just helping our community to be as progressive as possible!
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Cortana gets revived half way through the game into the new body. The rest of the game is a Cortana sex simulator.