I was thinking about the Minions that follow us around and basically entertain us with their pixels, and then I thought about the Minion used by the Goldsmith guild master. It provides her with useful information about crafting in the field of goldsmithing, and is a rather large part of that storyline.
It would be cool if each minion, or a number of minions had one slot for materia. Perhaps the materia slot would be based on character level, or perhaps it would be something you quested to earn a higher ranked slot, or perhaps it would be a static value like rank I or rank III.
Perhaps each type of minion has a particular category or class of materia it can take, like the Airship might be great for wind materia and crafting materia.
So the basic idea would probably average to a +1 to +3 bonus in some specific area for having a minion out. What do you think?