Molotov Cocktease is a Russian assassin that leads a group of female mercenaries known as The Blackhearts on The Venture Bros.  Molotov has a weird relationship and history with Brock where the two are either trying to kill each other or come close to making love, but always stopping short because of her chastity belt.

She's definitely done friendly things for Brock including watching over Dean and Hank in his abscence, but has also shot him.  So go figure.

Venture Bros. Quotes

Hunters Gathers: Her tits were like "coming home from school and finding out your old man ran over your cat" sad.
Brock Samson: Mournful tits. She has mournful tits. They're like two suicide notes stuffed into a glitter bra.

Hank: You are not the boss of me
Sgt Hatred: Au contraire, I am tony danza to your spunky Alyssa Milano. I am full on Charles In Charge of you