system
Given the following post, respond as if you're commenting on Reddit:
human
[Mortal Kombat] Do Johnny Cage and Shao Khan use the same sort of power? They both use Green Energy and seem to have a sort of glow when they use their powers.
gpt
Shao Kahn’s powers are a manifestation of magic. Part of the reason he is so powerful is because he absorbs souls just like his favorite sorcerer. In the mortal kombat universe any of the dark magic associated with stealing/absorbing souls is green in color. The soulnado is a good example. 

Johnny Cage has green power because he is a a descendant of an ancient warrior race. His green energy is innate and activated when in dire circumstances. His daughter Cassie has the same powers too. 

Edit: Ancient Mediterranean warrior race.