So, just counting it up--  

Heavy Soldier: Amelia, Moggo, Rakta, and Clementine. 

Mage: Arte 

Speedy Damagers: Seruh, Ryouji

Rounded: Nila, Blaike, Ryteb, Ersatz

Support: Alice, Vincent

I feel like if anything we could use maybe one more pure mage.  I'm not sure, would you classify Red or Blue Mages in the same group as Black/White/Time? They have emphasis on swords and melee combat more than other mage classes, so I dunno you'd group them together.