Mii characters have starred in more than 100 games!.Since then, they’ve made appearances in many games on Wii, Nintendo 3DS, Wii U and Nintendo Switch – here are some highlights from their 15-year journey so far: You could enjoy golf, tennis, bowling, boxing and baseball as a Mii, and yet, that’s far from their only adventure! Mii characters have been around for 15 years! They made their first appearance on Wii in 2006, and they were quite the sporty bunch as the stars of Wii Sports.