thetis is great for anti-paralysis bosses. lyla supposedly has excellent raw stats to work with but I don't have her to try it out myself. sherry and claudia are decent (particularly sherry whose AWS has rather insane overall magic dps). shizuka...can't really say much for her since her class itself is a little sad. but if you ever use any samurai it's probably her I think, based on comments by dmm veterans.