Cassandra "Cass" Cain is a young thief in Gotham City who was being hunted by Black Mask for stealing the Bertinelli diamond from his right-hand, Victor Zsasz.
After killing Black Mask, Cass had become Harley Quinn's apprentice and a part of Harley Quinn and Associates.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...
