Isaac started the game as a kind of take on the Calculator (Arithmetician, if you're nasty).
He had about zero actual combat aptitude. He relied heavily on his ability to identify flaws in structure/stance/positioning and was almost incapable of prevailing in any conflict where he couldn't think faster than his opponent moved. He attempted to make up for this by dabbling in Alchemy to produce chemical mixtures that might/might not replicate the effects of some very simple magic.
In 1.0, this translated into a Gladiator who had a few basic spells from this and that, and would frequently be using shortswords, daggers, and chain instead of plate. Heavier weapons were entirely out of the question IC.
As time went on, and he was brought face-to-face with horrible things, and then some interesting Garlean technology, he became a Machinist (FFVI). Constant conflict encouraged him to practice and experiment with different sorts of weapons and armor. Salvaging scrap provided materials for him to build a series of gadgets that were not only more effective than the chemical mixtures from earlier, but more reliable.
So, with the re-shuffling of abilities and where they can/can't go with the job system, this meant that Isaac had a tool for just about everything.
Summary: Yep, played a Calculator who had a splash of Chemist thrown in, who then became a Machinist.
He had about zero actual combat aptitude. He relied heavily on his ability to identify flaws in structure/stance/positioning and was almost incapable of prevailing in any conflict where he couldn't think faster than his opponent moved. He attempted to make up for this by dabbling in Alchemy to produce chemical mixtures that might/might not replicate the effects of some very simple magic.
In 1.0, this translated into a Gladiator who had a few basic spells from this and that, and would frequently be using shortswords, daggers, and chain instead of plate. Heavier weapons were entirely out of the question IC.
As time went on, and he was brought face-to-face with horrible things, and then some interesting Garlean technology, he became a Machinist (FFVI). Constant conflict encouraged him to practice and experiment with different sorts of weapons and armor. Salvaging scrap provided materials for him to build a series of gadgets that were not only more effective than the chemical mixtures from earlier, but more reliable.
So, with the re-shuffling of abilities and where they can/can't go with the job system, this meant that Isaac had a tool for just about everything.
Summary: Yep, played a Calculator who had a splash of Chemist thrown in, who then became a Machinist.