Their special attack Smirk inflicts Stop, and this can be highly dangerous when the Face is accompanied by Necromancers and Zeveaks. Also, they use 1000 Needles when they are alone, which always does 1,000 HP of damage to one target, is unblockable, and ignores Defense. If the party is weak, this can instantly KO a character.
The player should use Blizzara and Blizzaga spells to do the most damage against them, as they are weak to Ice-elemental attacks.
Face's Smirk will cause no end of trouble for the player, but Face is also vulnerable to Stop as well. By using Gogo and equipping him/her with three Sketch commands, he/she will either use Smirk 25% of the time, or 1000 Needles 75% of the time.