Given the fact that Deadpool is now the highest-grossing R-rated film of all time, it makes sense that Fox would be interested in using the now world-famous character to help market X-Men: Apocalypse, as they did with the film's Japanese trailer.
That's right, Ryan Reynolds appears as the Merc with a Mouth appears in the latest Japanese promo for the mutant extravaganza to offer a hilarious commentary. He didn't appear in the film itself, so this is probably the next best thing.
Deadpool has currently grossed $14 million in Japan, bringing its worldwide total to $780 million, whilst X-Men: Apocalypse's global haul stands at $523 million.