Most Information and Bio picture are from Xbox360Achievements.org and its posters xRogue 5x and Fizzmatix. Original thread can be found at this location.
Darkest is a Most Wanted Ghost in the online multiplayer mode of Ghostbusters: The Video Game. He is a variation of the Black Slime Ghost and the player can confront him by capturing Mad Mad Minimo and defeating 15 Black Slime Monsters throughout all Cemetery levels. He only appears in the Cemetery levels.