Dorian Tyrell

Dorian Tyrell is the main antagonist of the live-action Mask movie and was a sociopathic mobster with a dark and decidely homicidal personality - as a normal human being he was dangerous enough but near the climax of the movie Dorian Tyrell is able to get his hands on the legendary Mask itself and transformed into a demonic version of the green-skinned hero (ironically this homicidal Mask was closer to the original comic book version than the heroic one portrayed in the film).

At any rate despite gaining the power of the Mask Dorian Tyrell was ultimately defeated and met a rather unique end in the form of being, quite literally, flushed away..