Fishbone D

Fishbone D towers as a large, humanoid Hollow crowned by a fish-shaped mask, with a dorsal fin jutting from his back. Plating that seems part of his mask armors his shoulders and arms, and dark gray stripes band his body in a pattern much like a fish's scales.

Fishbone D runs down the Plus of a dead girl who had lingered near Ichigo's home, and though Rukia Kuchiki is on his trail, Ichigo's overwhelming spiritual pressure dulls her senses and she loses him. After devouring the spirit, the Hollow smashes into the Kurosaki Clinic, striking Ichigo's father Isshin and sister Karin before snatching Yuzu and hauling her outside. Her screams bring Ichigo running with a baseball bat, which Fishbone D shatters with a single blow. Rukia cuts his arm to make him drop Yuzu, and he slips back to Hueco Mundo to mend the wound, then returns to fling the Shinigami into a wall. To shield Ichigo, Rukia takes the Hollow's bite on her own body and pours her powers into him; reborn as a Substitute Shinigami, Ichigo severs Fishbone D's arm, and when the creature attacks once more rather than retreating, he cuts away its leg and cleaves its head, purifying it. The Hollow's name only comes to light chapters afterward, when Rukia moves to claim the bounty on him.

Fishbone D carries considerable spiritual power, enough that a seated-officer Rukia is startled by his Reiatsu and left gravely hurt by one of his bites. His bulk lends him real strength, letting him knock both Ichigo and Rukia away with single punches, and his neck can stretch several meters so he can snap at foes from a distance. Like other Hollows, he can duck briefly into Hueco Mundo to heal any injuries he takes.