This is all fictive ideas.
* Character Creation
You start out without any class but you get to put out stat points and get to choose some basic gear. Statistics effects Dialogue, Physique, Intelligence and so on and so forth.
* Classes/Advancing
A Class is something you find in the game, through a Trainer or through Learning by a book. You are the naked Adventurer without much skill and have to learn everything from scratch. Saga Frontierhas this random effect where there is a chance you might learn a technique in battle. Companions would/could teach you, and help you