I have only one objection. I suppose everyone has the "right to define themselves" and thus you can term yourself the "vicious babushka," but if anybody else called you "vicious" they'd have to deal with my teeth and claws.
Oddly, I'd feel better about "nefarious," "iniquitous," "barbarous," or even "Bad Babushka".
May I -- fondly --call you "Baba the Barbarian"?
Great work!
Keep on rockin’, Alouette!