During February's Nintendo Direct, Nintendo revealed that Miitopia, a 3DS game that first released in Japan in 2016 and the rest of the world in 2017, is coming to Switch on May 21. Preorders are already live.
This Switch port adds new customizations options, including brand-new make-up options and wigs. You can see all the changes in the trailer below.
The rest of the game plays similarly to the original 3DS game--you create and put forth custom Mii characters into various roles across an evolving kingdom. Whether your Mii becomes the hero or the next dark lord is up to you, and the kingdom as a whole will be influenced by your actions.