EXP

EXP is a mechanic in Miitopia. EXP is gained from defeating monsters and playing the Roulette. All Miis in the party receive the full amount of EXP after a battle. EXP from the Roulette is given to only one Mii and varies in amount. Gaining enough EXP makes a Mii level up, which increases their stats and may give them a new skill according to their Job. Miis may also gain bonus EXP after a battle depending on how low their level is.

Curing sickness
After defeating the Dark Lord, Miis have a random chance to get sick after coming back to the Inn (although the Hero cannot become sick until beating the Darkest Lord). In addition to events and having a roommate, gaining EXP can cure a Mii.