I disagree solely for the novelty of having a main protagonist like her. Seriously, were Zero male, nobody would bat an eye to her violent, cruel, foulmouthed and sexual behavior. Zero being a woman makes her stand out of the crowd. She reminds me a lot of Kratos form the original GoW trilogy.
I cannot deny the connotations are here, like while confronting Decadus after Zero killed Four.
But again, Decadus is a colossal masochist like five levels below I'd start screaming whatever is the save word of turn is. He's definitely bound to enjoy whatever Zero has for him in store.