You can change a character's class using Class Change.
Each character has a specific class. The class will be released as the game progresses.
Stats will change according to class, as well as Class Skills which are specific to each Class.
Here are a few types of Class Skills:
★ Symbol Attack SP Recovery
When you go into battle with a symbol attack, your SP will recover a little.
For 3 turns, you cannot be targeted by allies or enemies. However, if you're within an effect's range, you will receive that effect.
★ Stayin' Alive!
When you receive a damage to the point of fainting, your HP won't drop below 1 for one instance.