I'm Wade Wilson. Based on your complexion, I'm guessing no relation.
And basically? It's possible because the reality gem is going nuttier than a Deadpool family reunion, and is bringing folks from alllllll sots of realities into this one. So, people that were fictional to us? BLAMMO. They're real in other realities. Including this one, now.
Cosmo doesn't seem quite so weird now that you know Darth Vader might be chilling in the coffee shop, huh?