Quote Originally Posted by Sum1sGruj View Post
You won't have to use Quina or Freya much as the game makes them less usuable.
Two of the most powerful and versatile characters in the game are "less usable"? They can both take the place of Healer while dealing out maximum damage for next to no cost, and Quina has a variety of attacks that dramatically weaken the enemy. Amarant can also act as a Healer, though to a more limited capacity (he does have Revive, however), and when paired with Vivi the Curse/Elemental Magic combo can be devastating, especially when Vivi enters Trance.

In my opinion, the only reasonably useless characters in terms of battle are Garnet and Eiko, as their abilities are expensive and unnecessary. Garnet isn't needed because her summon aren't even in the same league as Vivi, and her White Magic is unecessary due to the characters mentioned above. Eiko's summons are more useful, though still not that important, and her White Magic is only slightly better than Garnet's (with particular mention to Holy). Their uselessness in battle is offset by their integral role throughout the story, however.