There are many jobs available in Miitopia. Every job has different powers, abilities, and stats.
Default jobs for the first world:
Jobs unlocked after clearing Greenhorne
Jobs unlocked after clearing Neksdor
Jobs that need charms
Job changesAfter every area, the Dark Lord seals away the player's powers and they have to choose a new job. But after clearing the Realm of the Fey the player's powers are still there because they were "too strong".
In Karkaton, right before the volcano, the player and their party members will become able to change into any job of their choice, so the player's Mii can choose a job that the Dark Lord sealed away previously. A Mii's old jobs' progress will be maintained even after being sealed.