It's curious to me that people have this sense that only the male V is trying to sound "tough" while female V isn't.
For me, both of them speak with a deeper voice (than their natural tone) because both of them needed to make V sound tough.
But it's harder to notice in Cherami's voice, because her natural voice is naturally higher (at least that's the way it sounds to me, when I watch her interviews), and she probably trained a lot to make female V sound more natural in a deeper tone.
And for me it worked ok for both V's because the player is always dealing with fixers, club bouncers, thugs, psycopaths, assassins, and V regularly needs to push them for information, so it would be strange to talk in a higher pitch.