There are many different plots that I think should be in the deadpool movie but the story I think they should include is [Deadpool](movie:38663) and his daughter Ellie.
The movie could start with deadpool already being awesome in his own way but goes on to explain his origin. We then go on to meet Shiklah (deadpool's bride)
Deadpool then suddenly discovers he has a daughter (Eleanor Camacho) (e.g.Ellie) but with Carmelita Camacho, a girl he ditched without knowing she was pregnant.
He then tries to hide it from Shiklah, but a bad guy like Butler (A doctor working for the Weapon X Program) tells her that he has been hiding Ellie from her.
Back in Canada, he was offered hope in the form of Department K, a special weapons development branch of the Canadian government. Wilson became a test subject in Department K’s branch of the joint U.S./Canadian superhuman enhancement project, the Weapon X Program; his cancer was temporarily arrested via the implantation of a healing factor derived from another Department K agent, the mutant Wolverine.
Shiklah goes ape shit and tries to kill deadpool while taskmaster goes to kill Ellie, and the final battle of the movie is deadpool vs taskmaster. Shiklah then accepts Ellie and pretty much adopts her.
You may have a different idea to me, so please put it below as I am interested to know.