I hope this clears up some of the Rogue>Ninja rage

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Let's be honest people, the only real difference between Thief and Rogue is in your own heads

1) Final Fantasy is based on recurring motifs. They are certain NPCs (Biggs/Wedge/Cid), a heavy emphasis on crystals, variations of the same spell conventions, and jobs. Motifs are CRITICAL in Final Fantasy because otherwise the games would have nothing in common at all.

2) Ninjas and Thieves are similar and in fact they are related. Ninjas are more evasive, and they mix ninjutsu, melee damage, and throwing whereas Thieves are more focused on treasures and loot, and they have ways to FLEE when things go badly. Other than that, every FF Thief has their own play style. It's a diverse role but with its own set of recurring motifs.

3) They get creative in every game where there is a Thief. They appear in many forms. This has never been a problem before.