Blue Mages are quite often the most useful characters in the entire game, it's due to their variety of magic that makes them good in almost every aspect, be it for defensive, offensive, or just support purposes. Sure, obtaining magic can be rather tedious, but in the end it's quite worth it. I myself love Blue Mages the most, I also think they're quite underrated, they fall victim to their bad design and non important role through the game.
Khimari has to be the worst Blue Mage I've ever seen, keep in mind I still haven't seen Gau's full potential, I actually didn't bother to train that guy. From what I've read and my own experience Blue Mage has to be one of the best classes in Final Fantasy V, not to mention that you can make him even more better by combining multiple classes. As for Quina and Quistis, both the most useful characters in the respective games. Necron's a joke with Quina in your party, my key character in fight against Ozma and an essential factor in lvl 1 playthrough challenge. Quistis made Omega Weapon and Ultimecia look like a regular opponents , I even dare to say that her Blue Magic limit brake is the best limit break in the entire game, The End and Leonhart including. So yea, I do use Blue Magic, Blue Mages are usually key characters in my party, and sorry I couldn't help you with Gau, I really didn't bother to train that character.
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