Addition of Alter Ego

Previously I thought that using the flaws in Michael's personality as the demons within his mind would be enough to stimulate character growth and progression however I recently realised that this left a lack of urgency. Why does the character need to defeat the demons quickly? What is the time frame? so I decided to add an alternative more sinister version of Michael that could assume control over his body if he fails to defeat his demons. Not only does this add a sense of urgency but it allows for whoever plays the character to gain a real sense of depth and forces them to explore the character much more than the previous story would allow.