So, name a DC superhero and name the DC supervillain you think has taken the most from that hero, and what they've taken from that hero. Examples:

Aquaman: Black Mantra = Killed Arthur Jr.

Batman: Joker (I don't consider Joe Chill a supervillain) = Killed Jason Todd, Revillainized Catwoman, crippled Barbra Gordon...which would make him Barbra Gordon's too.

Flash II: Reverse-Flash = Killed Iris.

etc.

Thanks!