Also, I hope you have a New 3DS
I don’t know why it didn’t cross my mind, but the upcoming 3DS edition of Hyrule Warriors Legends will not have campaign co-op. This video confirms as much, noting that you can play levels side-by-side with a friend to see who finishes first, in a race of sorts.
In other Legends news, I really hope you have a New 3DS, as the game apparently chugs on old models to the point where it doesn’t even look playable. It’s amazing that the 3DS is still being supported as it’s an awesome system, but it’s starting to reach its limitations, even when it comes to first-party (and third-party too, in this case) games.