When a translucent humanoid creature gets his memory back, he sets out to become the worlds judge, jury and executioner based on his way of life, while dealing with a group of people that disagree with his ways and try to stop him at any cost

Good and interesting idea, however, is there a motive such as a specific memory as to why he wants to “become the worlds judge, jury and executioner” – this may better your logline in establishing the event that happened and the action the creature takes as a response to the event.

I think “become the worlds judge, jury and executioner” could be a little simplified.

Other than that, really interesting idea and would like to see how this could turn into a short film!