Hello, I'm an expert in comic book lore and history. Let's dive into the origins of these two popular characters.

Deathstroke, also known as Slade Wilson, was created by writer Marv Wolfman and artist George Pérez. He first appeared in "The New Teen Titans" #2 in December 1980. Deathstroke is a highly skilled assassin with enhanced strength, agility, and a regenerative healing factor, all of which he gained from an experimental serum.

Deadpool, whose real name is Wade Wilson, was created by writer Fabian Nicieza and artist Rob Liefeld. Deadpool made his first appearance in "The New Mutants" #98, which was published in February 1991. Deadpool is a disfigured and mentally unstable mercenary with an accelerated healing factor, a sharp wit, and a tendency for breaking the fourth wall.

So, to answer your question, Deathstroke came out first, predating Deadpool by about a decade.

read more >>

While Deathstroke, who is a great villain in his own right, appeared first in The New Teen Titans in 1980, Deadpool didn't show up for another decade, when world-famous hack/thief Rob Liefeld introduced him as a villain in a New Mutants comic at Marvel.read more >>