Much like the character himself, Deadpool doesn't fit easily into the X-Men universe. After all, the character was first introduced in a totally different manner — yet was still played by Ryan Reynolds — in 2009's Wolverine. However, the time reset in Days of Future Past can help sort this out. Since the events of X-Men Origins: Wolverine never took place, Wade Wilson was never turned into Weapon XI and was free to live out the 2016 origin story we see play out in Deadpool.