A fight

Mizuki, the flower maiden was in a glass ball with cuffs around her arms and ankles in Jagura's chambers. Kiba, whom was badly cut trying to fight to save Mizuki from Jagura's evil plans. Darcia just standing by watches the fight until a figure appears. The figure challenges Jagura then changes her mind to really see if Jagura's a worthy opponent to fight. Who is this figure?