Um, he's also killed Tavros and Bro. They're not gender-based killings. It's about kids having to deal with death in a coming of age story, not about killing girls because they're females in comics. This is the sort of feminist commentary I like the absolute least, because it assumes that every time a woman dies it's because of misogyny, not because of any deeper plot reason. Would you prefer that only male characters die? Because that's hypocritical. Girls can die without it being the same as being fridged.