Well, so they are always present, and in each game they look different, too. here are some of them, in some of the games ~~>
These above are from the Crystal Chronicle series... on the order: Ring of Fates, Echoes of Time, My life as a King and the first, original Crystal Chronicles.
Left One: FF Crystal Bearers ~~ Right One: FF VIII
Left: FF Tactics A-2 ~~ Right: FF Tactics