Brigid

Brigid has 3-star knowledge in every possible quest in the game. Therefore she's invaluable regarding information.

She is focused on applying debuffs (torpor, silence and blindness), which will help your main pawn to build knowledge about enemies as well. But she is also capable of doing great damage with Seism. Plus, Holy Boon is gonna be a huge game-changer for those who want to play the DLC content.

With 1st tier skills, she ends up casting a lot faster and using less stamina. The only exception is High Voidspell, which is needed to remove petrification and other debuffs from party members.

Finally, all her equipment is dragon-forged, and the augments are the best ones for the vocation.