Bompupu

Notes:

 * Spams an enhanced version of Utsusemi: Ni for a couple of seconds to produce 4 clones of herself.
 * Clones are quite weak defensively; AoE damage works well.
 * Clones seem to resist all sleep spells.
 * Ninjutsu magic is spammed, causing bad spell lock when changing targets.
 * Eventually (after 3~5 minutes)she will become targetable and must be defeated to win the battle.
 * Easiest way to tell which one is real: she takes less damage and maintain her HP while all the clones respawn with 100% HP.
 * Even after becoming targetable, she continues to spawn clones of herself. Pay attention to which enemy is using Utsusemi to know which is the enemy that needs to be defeated.
 * After defeating the real version, any clones still out will shortly depop.