The Comedian
Who is he? Edward Blake, the Watchmen universe’s analogue to Nick Fury and Charlton Comics character Peacemaker. Getting his start as a costumed hero at the age of 16, Blake was driven by greed and a love for violence and later joined up with the Minutemen. Once that fell through, he joined on as a member of the Watchmen, going with Dr. Manhattan into Vietnam during the war and committing numerous atrocities. His death is the catalyst for the entire comic, having been killed by Ozymandias at the beginning.
Why include him? Let’s face it, for as much of a scumbag and nihilist as he is, Comedian is one of the most popular Watchmen characters, in part for his disgusting personality, and also because of his performance by Jeffrey Dean Morgan in the 2009 film. Injustice 2 looks to be as goofily brutal as the first one, so it makes complete sense for a guy dressed like a militaristic Groucho Marx to show up and bust some heads open.