Grand Anodyne / Grand Levin / Grand Frigor
Scarlett is a loyal pawn that prioritizes your party's and your safety first. She has high debilitation resistances and has no issues in running through BBI or fighting ur-dragon.
Being a mage, scarlett ensures the safety of your party, would cure any member of any debilitations and focus on clearing out smaller enemies so you can focus on the boss without worrying about your and your party's health.
Give her a try, she is grateful for your company. Thanks for the hire!