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.