While Deadpool is now one of the most popular characters to have come out of the Fox X-Men era, his on-screen debut in X-Men Origins: Wolverine caused creatives to call Rob Liefield, the creator of Deadpool, desperately looking for help. X-Men Origins was released in 2009, just as the MCU was in its infancy, and it proved to be one of the most controversial entries in the Wolverine saga due to a number of odd choices for the film. However, one of the most egregious errors in judgment came in the form of how the character, Deadpool, was handled.

https://screenrant.com/deadpool-xmen-origins-creator-marvel-movie-sos/