Minazuki

Minazuki never speaks and reveals little individual emotion. It obeys Muramasa during the rebellion but is less openly violent than many of the affected spirits.

Its encounter with Ichigo is notably indirect. Rather than standing to fight, Minazuki repeatedly evades him and appears to guide him through the cavern toward the imprisoned Captain-Commander.

Minazuki possesses immense spiritual power as the spirit of Retsu Unohana’s Zanpakutō. Together with Katen Kyōkotsu and Sōgyo no Kotowari, it maintains a barrier powerful enough to contain Genryūsai Shigekuni Yamamoto.

The manifested spirit is exceptionally swift. It evades every attack Ichigo Kurosaki directs at it while moving through the cavern’s tunnels.

No healing technique, Bankai ability, or direct attack is demonstrated by this humanoid form. The main storyline’s established Shikai remains a giant flying creature capable of transporting and healing patients inside its stomach, but the materialized spirit never assumes that form onscreen.

Minazuki approaches the First Division headquarters alongside Katen Kyōkotsu and Sōgyo no Kotowari. The three spirits assist in seizing Yamamoto and sustain the seal that prevents his overwhelming power from disrupting Muramasa’s rebellion.

When the rescue party enters the cavern, Minazuki encounters Ichigo. It avoids his strikes and retreats deeper into the tunnels, apparently leading him toward Yamamoto rather than attempting to defeat him.

After the rebellion, Minazuki briefly assists the Shinigami and other spirits during the Tōjū incidents. The spiritual force maintaining its materialized body eventually expires, returning Minazuki permanently to Unohana’s sword.

Retsu Unohana is Minazuki’s master, although the anime gives the two no direct reunion scene.

Muramasa draws Minazuki into the rebellion. Katen Kyōkotsu and Sōgyo no Kotowari work with it to imprison Genryūsai Shigekuni Yamamoto.

Ichigo Kurosaki pursues Minazuki through the cavern and is seemingly guided toward Yamamoto.