If Overwatch got a Switch port I could totally see Blizzard and Nintendo at least making some Switch exclusive skins. Like the two biggest no brainers are Wario Roadhog and Waluigi Junkrat. I can also see things like Captain Falcon Soldier 76, Palutena Mercy (though Mercy's already got a skin similar to that), and Bayonetta Widowmaker (yes technically Bayo is owned by Sega, but Nintendo seems to hold a lot of sway over what's done with the character now given they directly paid for both her second and third games, while Sega really only has much say in what's done with the original like the 2017 Steam port, something that won't happen with Bayo 2 and 3 unless Nintendo are the ones who say so).

Man, if Nintendo ever did a cross promotion with Blizzard like this, I'd use Link as my main until I got banned and realize that Overwatch is a crappy game.