Katsuyu

Katsuyu is an enormous entity whose true size is unknown. The general size of the summoned portion of Katsuyu is easily as tall as the largest building in Konoha. During the Fourth Shinobi World War, Tsunade mentioned that her and Sakura's combined capabilities are only able to summon one-tenth of the slug's actual size, which easily dwarfed neighbouring mountain ranges — being able to cover the Allied Shinobi Forces when liquified. In fact, unlike other summons which may be multiple in number as well as vary in size, the slugs summoned by Sakura and Tsunade are all portions of the same entity. It is predominantly white in colour with three blue streaks that run vertically down the middle and side of its body from its head and tapering off at its tail. Its optical tentacles have a slight tint of grey to them and it also has two sensory tentacles on either side of its mouth.

At some point during the Second Shinobi World War, Katsuyu was summoned to the battlefield, alongside Gamabunta and Manda.