Fromdo +‎bad +‎-er, afterdo-gooder.

do-badder (pluraldo-badders)

1. (informal) A person who does bad things.
   • 1967 June 10,Roy Thomas,Avengers, volume 1, number41, page 8:

     "Later, he was given artificial life by ado-badder called Diablo--and almost destroyed the Fantastic Four themselves..."