>eats like a boy
>games like a boy
>looks like a boy
>proudly proclaims she's a woman in voice lines for some reason, when no other character does
>proudly wears tranny flag colors

For whatever reason, Blizzard upgraded D.Va's ass to make it more feminine, but didn't with Kiriko.

She may no longer be a boy, but I suspect she was at some point. Feel free to provide your argument, but I suspect you don't have one.