DC Comics is known for breaking new ground. The publisher has done more to expand what superhero comics can be than its marvelous competition, and that includes ongoing series starring villains. The Joker got his first ongoing book back in the 1970s, and in the next few decades, characters like Deathstroke, Catwoman, and Harley Quinn all got their own ongoing series.
Source：https://www.cbr.com/supervillains-dc-comics-deserve-ongoing-series/
