The fourth wall will be very much shattered when these three characters show up to fight. No. Worse, the world will end.
Our contestants are Deadpool, Pinkie Pie and Providence from Bravely Second. You wouldn’t get why Providence is here if you haven’t played Bravely Second, as his battle has him addressing the player and messing with their save file, in fact, he tries to erase your save data. I refuse to spoil when you fight him or what his role in the game is. But he’s here because he breaks the fourth wall.