Ideas for new features for Smash on the Switch

Like in Smash Tour, I think it would be awesome if you could select different characters for each stock. This could allow for some interesting counterpicking, because maybe your opponent is planning to use a character with a winning matchup against your main for their second character, so you could pick a better character to play against your opponent for the second stock. Plus, that way, full roster iron man challenges would be much easier.