It seems that Ryan Reynolds IS Deadpool on and off the set.
From the Graham Norton Show ( I do like him, with his Brit Wit):
For good measure, another interview, explaining why EVERYONE loves Reynolds:
Are you excited yet for Deadpool 2? This will probably be sold out from opening, through the weekend, so get your tickets early, or else chill out and have a Deadpool 1 rewatch party.
I’m set with a Deadpool shirt, some Deadpool buttons, and a big shyte-eating grin, ready to go.
There’s tons of Deadpool merch. There’s even a Star Wars/Deadpool mashup in the list – hey, crossovers! I’m personally wearing the black shirt with the ‘eyes’ logo. Anyway, have fun looking: