Is it ok to spoil things here? So D will be like the protagonist in DC Life: Apocalypse?
Based on lore, he will die spreading the infection at Capital City. So you're not going to play as him. If you played Dream City Apocalypse until the end, you'll discover the game takes place 200 years in the future acknowledging the apocalypse had already happened in the past. This was the apocalypse triggered by D****.