Here's a really good idea if you want to take a spark or two in creativity for another Miitopia save game.
So, start up a new game (If you really want to, take pictures of your previous save so you won't forget it), and then as new members arrive, you can design them on game characters! For this idea, though, here's the catch! It must only be involved in one gaming franchise.
If you chose Super Mario, for example, you would obviously choose Mario as the protagonist. Then, unlocking new members of the team means it has to be from the same gaming franchise as well. (E.g, Mario as a Warrior, Luigi as a Thief, Peach as a Pop Star and Yoshi as a Cook.)
If keeping this in mind, the game can become a whole load more interesting, all with your (if so) favourite gaming characters all in one game!