FFVII:
-Cloud: Got to be in the Center.
-Vincent: Older and more experienced, he leans into knowledge the rest of the gang in other intrepretations besides the original ''AC/DoC''
FFVIII:
-Squall: Leads by Power. (Courage, Determination...ect)
-Quistis: Leads by Knowledge. (Instructor)
-Seifer: ... 'attack'.
FFX:
-Auron: Only one who fits the cathegory. (Power/Mind/Spirit...)
FFXII:
-Balthier: Story revolves around them, Vaan would be lost without him.
-Ashes: Story revolves around them, Ashes is a Princess
-Vayne: Story revolves around him, Vayne is the emperor.