Wednesday Addams as a gothic 21 year old, but she has the mind of Hannibal Lecter.  Her family lives in a mansion, she had an ydillic if somewhat eccentric youth, home taught, and then her family dies because of an oil company poisons them. She works her way to the top using he hyperintelligence, taking horrible vengeance on all responsible.

Variant – this UK  born girl lives in Ukraine, her parents are bombed by the Russian invasion, and she works her way up to Putin and kills them all.