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Where should you start with Final Fantasy?
Version differences for each game
In Final Fantasy V, each job has a bonus or penalty to every stat. This is applied to the character when they are in that job, but it doesn't not affect their growth when they level-up. Because of that, the characters' final stats are not affected by what jobs they are in when they raise a level.
It's worth noting that when you master a job, the stat bonuses (but not the stat penalties) for that job are given to the character's Freelancer job. If you master multiple jobs, only the job with the highest bonuses in each stat are applied, but you can boost the Freelancer's stats this way. The best stat bonuses are Monk or Gladiator for Strength (+26), Thief for Agility (+16), Monk for Stamina (+26), and Oracle for Magic (+36).