The Darkness Behind A Good Man's Smile (Dar...
Mark was just a kid when Dark first revealed himself. Now he's an adult, with a job, a life and a large fan base but it appears Dark has grown up too...
There are many theories about Darkiplier, a few being:
•A demon possessing Mark
•A shape shifter mimicking Mark
•voice in mark's head
•tulpa (something brought to life through mass belief, e.g. slender man becoming real because he has so many fans)
My theory is almost a mix of all of these and here it is...