Black Widows

Black Widows is a type of misandrist, this is a common type of villain in folklore, fictional works, and real life. They are females who make a habit of marrying males and then killing them in cold blood, most of the time for monetary gain, but Black Widows can also be a specific type of serial killer. They are an obvious subtype of femme fatales but are almost always deadly; that is unless they're caught in time.

The male variant of a Black Widow is called a "Blue Beard". Just like their female counterparts, blue beards marry several different females and later kill them for their own various reasons.

Note: While some Black Widows are misandrists, not all of them necessarily have to be a misandrist but it's possible for them to count as such, though killing husbands can be what a misandrist does.