Deathstroke
- From: DC Comics
Deadpool’s invention was actually done in response to Deathstroke, as it was a deliberate copy. Deadpool only developed a proper character after that. Deathstroke was, at the time, a major villain that was the main antagonist for the Teen Titans. He’d also go on to have conflicts with other DC Superheroes, including Batman and many more. Slade Wilson is simply a mercenary for hire, which happened after he spent time in the U.S. Armed Forces. He is eventually chosen for a secret experiment by the Army, who gave him a drug that allowed him to use far more of his brain but also enhanced his physical kills, giving him near master control of his body too. That also included an accelerated healing factor with heightened senses.
Though he has had repeated conflicts with superheroes, most would claim that Deathstroke merely did his job usually. He has been written to be more villainous for a lot of TV shows, but in the comics, he is often sort of in the middle. Slade has always chosen humanity when it came to aliens or supernatural beings trying to conquer the Earth. He even ended the life of his son Jericho, who was taken over by the Souls of Azarath. Resulting in him losing control. Not to mention, most of the time Deathstroke has been capable of ending the lives of some heroes both young and old. Yet unless he is contracted to end them, he tends to avoid more bloodshed than what is required. He might not be a hero or villain but tends to make him one of the best comic book antiheroes ever to us.