I've been quite fascinated with Visha's character for some time now. After all, she does put up with quite alot of shit given that she spends so much time around Tanya and has clearly grown accustomed to suppressing her true thoughts and feelings of the scenario at hand in order to increase her own odds of survival. My personal theory is that this warped personlality didn't actually emerge as a result of Tanya, but rather as her defense mechanism against the constant emotional and physical abuse she must have received as a child on account of her father having clearly conceived her by sticking his dick into a cow. After all, beastiality is largely frowned upon in Russian culture and for him have conceived a child with a cow must have taken extrodinary magical potency on his part as well, showing that it could have possibly been accidental. Perhaps he didn't even do it for the purpose of having a child, but rather simply to say he could. Maybe that's why Visha is able to handle live or death situations so well, because she hasn't known any other way of life since the moment of her birth as people would undoubtably seek to kill such a monstrosity. In all likelihood her entire life has been one long struggle for survival punctuated by a brief moment of respite after she learned she was a mage, and so she deals with those situations so well becuase they are the norm for her as opposed to the terrifying, life altering catastrophies they are for othe people.

TL;DR: Visha's large, cow-like oppai give me a massive erection/open a floodgate in my ovaries.