Hitsugaya's Zanpakutō

Hitsugaya's zanpakutō is Hyōrinmaru (氷輪丸, lit. "Ice Ring", idiomatically "Full Moon"). When sealed, Hyōrinmaru looks almost exactly like a normal zanpakutō with the exception of the guard, which is in the shape of a four-pointed star. The hilt and the sheath are also light-blue, which matches Hyōrinmaru's abilities. Hyōrinmaru's shikai command is "sit upon the frosted heavens" (霜天に坐せ, sōten ni zase?, Viz: "reign over the frosted heavens," English TV: "reign over the frosted frozen sky"). Hyōrinmaru is the strongest of all water-ice element zanpakutō in Soul Society.5

In its shikai, Hyōrinmaru itself remains the same, but gains a crescent-shaped blade attached to the hilt by a chain. Hyōrinmaru allows Hitsugaya to control water and ice. His slashes create an immense amount of spirit power which overflows from the tip of the blade, creating a flow of ice shaped like a Chinese dragon. The dragon flies at opponents and instantly freezes anything it touches. The chain-blade also freezes anything Hitsugaya traps with it.