Marvel and DC Comics Have Totally Ripped Each Other Off… A Lot!
It seems Hollywood can’t come up with anything original anymore and comics aren’t immune to retreading old material either. Here is a list of comic characters that are basically the same person.
Deadpool vs Deathstoke

DC’s Deastroke debuted in 1980 as an enemy for the Teen Titans. He is an assassin and mercenary. He is a tactical genius, expert marksman, swordsman, and hand-to-hand combatant. A serum also granted him super-strength, speed, agility and durability.
He also has accelerated healing though not to levels where he could regenerate limbs or organs.
Marvel’s Deadpool debuted in 1991 as the fourth wall-breaking ‘Merc with a Mouth’. Originally cast as a villain to foil for Cable and the New Mutants, since then he has morphed into an anti-hero.
Due to his similarities to DC’s Deathstoke, his creators gave him the name Wade Wilson as a play off of Deathstroke’s real name, Slade Wilson. Deadpool’s abilities include an accelerated healing factor as well as being an expert martial artist, marksman, and swordsman.
Namor vs Aquaman

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Namor the Sub-Mariner is sometimes referred to as Marvel’s first mutant with his debut coming way back in 1939. He is the son of a human sea captain and an Atlantean princess.
Namor initially possessed the ability to communicate with all sea life and even imitate their powers, however he has lost these abilities for the most part over the course of his publication history.
His mainstay powers are his ability to breathe underwater, super strength, speed, agility, and reflexes. He also has enhanced vision granting him the ability to see in near complete darkness.
Namor can swim at super speeds, even for Atlantean standards and he can even fly with the aid of tiny wings on his ankles.
If you think Namor sounds eerily familiar to you even if you didn’t know who he was, it’s because his powers are almost identical to DC’s Aquaman. Aquaman debuted in 1941 and has been a key member in the Justice League along side Superman, Batman, and Wonder Woman.
Also an Atlantean, Aquaman shares many similar powers and abilities with Namor. He possesses super-human strength, stamina, endurance, durability, senses, healing, and reflexes. He also has telepathic abilities with aquatic life. He also gained the ability to fly later in his publication history.
Moon Knight vs Batman

Marvel’s Moon Knight debuted in 1975. So here is the rundown on Moon Knight: he is a millionaire entrepreneur who is a masked vigilante on the side. He is an expert detective, olympic-level athlete and is proficient in martial arts and armed combat. Moon Knight is also driven by vengeance.
Sounds like Batman. The major difference coming from the fact that Moon Knight’s alter ego, Marc Spector, is not his only alter ego. Spector suffers from dissociative identity disorder.
Moon Knight also gains increased strength from the lunar cycle due to his association with Khonshu, the Egyptian moon god.
Batman, the World’s Greatest Detective, is one of DC’s most famous and longest-running comics. Debuting in Detective Comics in 1939, Bruce Wayne is a billionaire playboy and philanthropist by day and a masked, crime-fighting vigilante by night.
Driven by the need for vengeance after the murder of his parents, Batman protects Gotham City and is a founding member of the Justice League.
Batman possesses a genius-level intellect, is in peak physical condition, an expert martial artist and hand-to-hand combatant and finally, Batman is an expert detective and tactician.
Red Tornado vs Vision

Vision originally debuted in 1940, but his character was re-introduced in his more-familiar android form in 1968. The second iteration of Vision was written as a creation of Ultron and was intended to be an enemy of the Avengers but later became a member of the Avengers.
Visions abilities include superhuman intelligent, speed, agility and strength. Vision has the ability to alter his density from ghost-like to extremely dense, flight, solar energy projections, and technopathy.
Red Tornado is DC’s android staple of the Justice League. Debuting in 1968, a few months before Vision was debuted as an android, has had his origins ret-conned a few times but the origin that most closely mirrors Vision’s is when Dr. Morrow creates Red Tornado to infiltrate the JLA only to later join the League.
Red Tornado is highly durable and possesses excessive strength and is cable of flight and producing tornado-force winds and is also a technopath.