Like multiple Marvel characters that have multiple versions of themself, you have to have a Canon Event, backstory, what made you a Deadpool, and of course have a goal, but the best part is you can break the 4th wall, meet other versions of yourself like Lady Deadpool, the Original, Wild West, Shogun, you name it! thanks to an abnormality in the timeline that isn't really major and will not kill your timeline (Thanks a lot TVA, really fucked up that one.), anyway, have fun!