I think if I was in a Final Fantasy world, I would be a person trying to learn all the magic available. Like my love for languages, I would want to master all magic classes.

Maybe in a story similiar to Yuna's, where instead of temples it would be Academies of Magic. To journey first alone, then along the way be joined by people searching for their purpose in life. I would want to be joined up with one other mage, and knight-type person, and a stealthy ninja-type.

After learning the magic classes, we would find that the world Entities (what would be AKA Summons) were in need of resurrection. My party would go to the eight altars and use my (and the other mage's, I guess) abilities to restore power and life into the Entities. They could grant us their power and help save the world from the Dark Entity.

Note: The other Entities would govern the powers of fire, water, ice, thunder, light (Holy), wind, and earth.