Dalk

Dalk (ダルク, Daruku) is Koga's Doll. While sealed, she takes the form of a small metal marble. The marble multiplies and expands into a large metal sphere with the Bount seal. When unsealed, the metal sphere explodes into a multitude of small metal spheres floating in the air, which coalesce into a semi-humanoid shape with a flirtatious female personality. Dalk has trouble with cold-based attacks, which make it difficult for her to split her body apart, such as when fighting against Tōshirō Hitsugaya's Zanpakutō, Hyōrinmaru. As a heavy, metal-based creature, she is vulnerable to Izuru Kira's Zanpakutō, Wabisuke, which doubles the weight of anything it cuts. In contrast, Dalk is nearly invulnerable to heat.