Horror and DC Comics go hand in hand, with DC having a reputation for being the "darker" company, often embracing this title for various subjects.
During the '80s, their books became darker and scarier, leading to the iconic Vertigo imprint, with examples like Batman & Robin and Batman: Dark Patterns, which added supernatural or body horror elements as a new threat for the Dark Knight.
The success of these titles raises the question of who else should have a horror book, as horror stories can be effectively wrapped around certain DC heroes, but may not fit as well with others, such as Superman.
Horror works well with comics as a medium
Author's summary: DC characters deserve horror series.