Heres some back ground knowledge into Tanya.
Tanya, born Tony Merret had a sex change in her late teens, if you look at IT close enough you will see Tanya has a adams apple. The coarse deep voice also gives away the fact that she was once a guy. Tanya also stopped taking estrogen a long time ago, and her testerone levels came back, explains why she is so nasty and hostile to others at a GM.