Yunita's Doppelganger uses mostly physical attacks against the party. The Doppelganger’s physical attacks do not inflict much damage, but they may inflict the Suppress and Curseailments. When it is encountered in the Witch's Mansion as a boss, the Doppelganger receives higher stats and can attack twice per turn. It can also cast Cura when its HP is low.
When fighting the enemy, it is highly advised of the player to equip a Darksteel Shield to all party members. To defeat the Doppelganger quickly, the player should attack light-elemental weapons and spells.