Nintendo has released a demo for the Switch version of Miitopia via the Nintendo eShop.
Here is an overview of the demo, via Nintendo:
In this demo of the game’s first area, you’ll be able to create and customize your Mii characters with wigs and makeup. While it can be fun to play as a Mii character that looks like you, Miitopia also lets you cast your friends, family or anyone you choose to star in your journey. Watch your characters come to life as your best friend and dear old grandma team up to topple the face-stealing