Do you have an example of data you want to store?
Like, do you have strength/dexterity/speed/hp/mp and position on the map, or, I dunno, or do you have more than that?
Gimme some more spec so I can narrow down the problem (:
Tell me what you think about the last vid on array if you have the courage to watch it :D (2h30)
Maybe you can find the beginning of an answer inside.