Deadpool is one of the most iconic and popular characters in the Marvel universe. This led to certain expectations when he had his first appearance in X-Men Origins: Wolverine. However, fans were disappointed and there were several news that Ryan Reynolds - who embodied Deadpool in the movie - and 20th Century Fox were interested in realizing a spin-off that is more tailored to the character.

The years passed by and many directors (e.g. Robert Rodriguez & Tim Miller) were connected to the spin-off. There were different scripts but the project didn't really take off to this day. This is due to Reynold's busy schedule and especially related to the desired rating. In order to do the character justice, the film has to be "R" rating material and this is where the problems start.

At the moment, 20th Century Fox hesitates to invest in an "R" rated comic film. Screenwriter Rhett Reese told Collider that Tim Miller produced a promo reel a while ago and that he is absolutely convinced of the potential:

"We have a phenomenal director in Tim Miller, who did about a 3-minute test for Fox, and Ryan came in to do the mo-cap for it and the voice.  And it’s like the greatest three minutes ever.  I look at the three minutes and I’m like, “That’s the movie, and it has to get made.”  I think the biggest hurdle right now is convincing the-powers-that-be that it’s okay to have a hard-R rated movie within the Marvel Universe."

Ryan Reynolds also hopes that Fox comes to a positive decision. He especially talks about the script being phenomenal but also being almost NC-17 material.

“I love Deadpool and there is a script that’s in development. But it’s so, so far into the R-rated zone… it’s a nearly NC-17 world and I just don’t know if the studio would ever risk their reputation doing it. We’ve been developing it and we would never wanna do it unless you could it that R-rated way, so…[The script has] got a similar tone [to Zombieland], almost. [Rhett Reese and Paul Wernick] wrote it and they developed it as well and, you know, it’s sitting there. You could do it for a pittance compared to the modern sort of epic scale superhero movies, but it’s about a guy who knows he’s in a movie and knows he’s in a comic book who is deeply mentally disturbed and hyper violent. And that’s tough to get by a studio.”